UNITED STATES SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 10-K

Commission file number 0-24758

Micro Linear Corporation

(Exact name of Registrant as specified in its charter)

Registrant’s telephone number, including area code:

(408) 433-5200

Securities registered pursuant to Section 12(b) of the Act:

None

Securities registered pursuant to Section 12(g) of the Act:

Common Stock, $.001 par value per share

Series A Participating Preferred Stock, $.001 par value per share

(Title of Class)

     Indicate by check mark whether the Registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.     Yes þ          No o

      Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of Registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K.     o

      Indicate by check mark whether the registrant is an accelerated filer (as defined in Rule 12b-2 of the Exchange Act).     Yes o          No þ

      The aggregate market value of the Common Stock held by non-affiliates of the Company, as of June 25, 2004 (the last business day of the registrant’s most recently completed second fiscal quarter, based upon the closing price of $5.74 per share on the Nasdaq National Market on such date), was approximately $52,989,068. Shares of Common Stock held by each executive officer and director and shares held by each holder of more than 5% of the common stock known to the registrant (based on Schedule 13G filings), have been excluded, in that such persons may under certain circumstances be deemed to be affiliates. This determination of executive officer or affiliate status is not necessarily a conclusive determination for other purposes.

      The number of shares of the Registrant’s Common Stock outstanding as of March 1, 2005, net of shares held in treasury, was 12,461,973.

TABLE OF CONTENTS

FORWARD LOOKING STATEMENTS

      When used in this Report, the words “expects”, “anticipates”, “estimates”, “believes”, “plans”, “designed to,” “allows,” “can,” “intend,” “will,” and similar expressions are intended to identify forward-looking statements. These are statements that relate to future periods, and include statements regarding the growth of markets for our digital wireless solutions, types of radios and basebands, our objective to become a leading provider of digital wireless solutions for many large global markets, our strategic initiatives to achieve that objective, including our focus on becoming a major provider of wireless semiconductors in the ISM and PCS bands, developing products based on existing intellectual property, developing customer partnerships and major strategic relationships in our target markets, increasing the number of customers and design wins by applying our digital wireless expertise to markets and applications other than digital cordless telephones, developing evaluation tools and reference designs to enable companies to quickly and efficiently implement wireless connectivity in their products using our wireless integrated circuits, using our high volume manufacturing and testing expertise to deliver cost effective products with rapid time to market and the anticipated benefits of these initiatives, our beliefs that the market for wireless consumer electronics, communications and industrial products is one of the most promising potential growth segments of the wireless semiconductor industry, the features and benefits and market acceptance of our products and technology, including our transceivers, our production-ready reference designs, silicon media conversion devices for Ethernet networks and application-specific radio solutions, the sources of our future revenue and concentration of customers, the competitive advantages of our core technologies, the advantages of our use of outside foundries, our intent to spend significant resources on new product and technology development, including wireless semiconductors in the three major ISM bands, our intent to broaden our markets into streaming applications, leverage our existing intellectual property in the development of new products and to develop customer and strategic relationships in our target markets, expected expenses, including research and development and selling, general and administrative functions, our ability to compete favorably in new product introduction, innovation, quality, reliability and performance, and the amount and timing of new product shipments, anticipated revenue from our wireless and networking products, our beliefs regarding our accounting policies, our expectation that international revenue will account for a significant percentage of our revenue for the next 12 months, our expectations regarding trends in our future gross margin, average selling prices for our wireless product and networking products, erosion in demand for our legacy networking products, our expectation that Uniden will continue to be our largest customer for the next 12 months, our belief that trade payable balances will continue to fluctuate from period to period due to variations in our production cycle and timing of other operating expenses and our beliefs as to the adequacy of our existing cash resources.

      Forward-looking statements are subject to risks and uncertainties that could cause actual results to differ materially from those projected. These risks and uncertainties include, but are not limited to, those risks discussed below and our dependence on key products and customers, changes in the demand for our products and seasonal factors affecting certain of our products, our ability to attract and retain customers and distribution partners for existing and new products, our ability to develop and introduce new and enhanced products in a timely manner, our dependence on international sales and risks associated with international operations, our dependence on outside foundries and test subcontractors in the manufacturing process and other outside suppliers, our ability to recruit and retain qualified employees, and the strength of competitive offerings and the prices being charged by those competitors, and the risks set forth below under “Factors that May Affect Future Operating Results”.

      These forward-looking statements speak only as of the date hereof. We expressly disclaim any obligation or undertaking to release publicly any updates or revisions to any forward-looking statements contained herein, to reflect any change in our expectations with regard thereto or any change in events, conditions or circumstances on which any such statement is based.

      All references to “Micro Linear”, “we”, “us”, “our” or the “Company” mean Micro Linear Corporation and its subsidiary, except where it is made clear that the term means only the parent company.

PART I

General

      Micro Linear Corporation is a fabless semiconductor company specializing in wireless integrated circuit solutions, which enable a variety of wireless products, serving a global market. Our products are used in many streaming wireless consumer applications such as digital cordless phones, PHS (Personal Handyphone System) handsets, wireless home theater speakers and headphones, security cameras, video game controllers, cordless headsets, digital baby monitors, computer peripherals, and other personal electronic appliances. Industrial applications that incorporate our products include lighting controls, home automation products, heating and cooling controls, vending machine controls, automatic meter reading devices, environmental monitoring devices and mesh networking nodes.

      Our products are used in designs that replace wires to transfer information. We believe wireless connectivity offers freedom of mobility, flexibility of configuration, and significant infrastructure installation cost savings. An increasing number of products that were traditionally wired are now increasingly being designed as wireless, including telephone handsets, cell phone headsets, video game controllers, audio headphones and speakers, and computer peripherals. We believe that the benefits of these digital wireless solutions, combined with the cost-effectiveness of our products, will result in significant market growth for our products as more and more applications adopt digital wireless connections.

      Our objective is to become a leading provider of digital wireless solutions for many large global markets. To meet this objective, we have embarked upon a number of strategic initiatives:

Markets and Products

      Digital wireless connectivity requires a radio frequency, or RF, physical interface and a baseband controller, the complexity of which depends on the specific application. The RF interface typically consists of an RF front end (power amplifier, low noise amplifier and switch), RF transceiver, and modem. The baseband controller provides an interface to the digital data source, control of the radio operation, and application support. We currently provide the RF transceiver and the RF front end, with the balance of the solution provided by other vendors, who in many cases have formed strategic marketing relationships with us. We believe our transceivers provide significant benefits to our customers, including lower cost, smaller form factor, higher data rates, enhanced range of operation, and an overall lower bill of material.

      During 2004, our wireless RF transceiver products represented approximately 74% of our net revenue, compared to 64% in 2003 and 62% in 2002. We have delivered over 25 million RF transceivers that can now be found in digital cordless telephones, cordless headsets, video game controllers, and other digital wireless products.

      During 2004, we expanded our customer base for RF transceivers to include additional digital cordless telephone vendors, video game controller suppliers, wireless headset manufacturers, and computer peripherals vendors. Products intended for the U.S. market use the unlicensed 5.8GHz and 900MHz frequency band, while wireless products designed for worldwide use operate at 2.4GHz. We began shipping our 5.8GHz product in high volume in 2004. This product is used in 5.8GHz digital cordless telephones targeted at the U.S. market.

      A growing number of manufacturers have emerged who do not have the capability, or the desire, to design a wireless product starting at the component level. To achieve design wins with these emerging manufacturers, we have significantly increased our customer support tools through the creation of production-ready reference designs. Currently, we offer four distinct reference designs that customers can copy or modify to allow them to easily integrate digital wireless connectivity into their products. Two designs operate at 900MHz: a less expensive low power (0dBm output power) radio, and a higher power (18dBm) version. Two operate at 2.4GHz, again with one design intended for shorter range, lower priced sockets and the second targeting maximum range applications. All of these solutions are pre-scanned for compliance to the Federal Communications Commission rules for use in the unlicensed frequency bands. We anticipate that we will continue to expand our reference designs for our 5.8GHz and PHS transceiver products.

      Our efforts in designing and testing these reference designs have afforded our engineers a good insight into the design issues confronted by our prospective customers, which we believe should assist us in making our new products more valuable to our customers. We intend to continue to develop application-specific reference designs based on our RF transceivers and other new products to support our customers’ engineering teams and to address additional market segments and customers.

      We offer media conversion products that enable implementation of cost effective fiber to the home or FTTH systems. Two existing industry standards define Ethernet protocols over twisted pair copper media: 10Base-T for 10Mbps and 100Base-TX for 100Mbps. A low-cost silicon solution called a media converter provides the required signal conversion at each point where the twisted pair copper media interfaces to fiber media.

      We believe we have been successful in providing silicon media conversion devices for Ethernet networks. We believe our product family is one of only a few that provides full auto-negotiation on both the twisted pair and fiber optic sides, to automatically configure the highest speed mode of operation on a link and select either half or full duplex operation. Additional benefits of our devices include providing the user a small footprint package, low power dissipation, and low component cost.

Sales and Distribution

      Our focus is on engaging large original equipment manufacturer customers, or OEMs, who incorporate wireless technologies into products targeted at high volume markets. To enable us to win business at these large accounts, our direct sales force focuses on key accounts. Sales to certain of our OEM customers do not carry return privileges and we recognize revenue for these sales upon shipment.

      We address smaller customers via a network of domestic and international representatives and distributors who specialize in RF components. In 2004, our domestic sales represented approximately 6% of net revenue, compared to 9% and 11% in 2003 and 2002, respectively. We offer our domestic distributors product return privileges and, in the event we lower the prices of products sold to distributors, we guarantee price protection on unsold inventory. We defer recognition of revenue and gross margin derived from sales to our domestic distributors until the distributors resell our products to their customers. Some sales to domestic distributors are below contract pricing and are not guaranteed price protection or return privileges. On these sales, we do not defer revenue.

      Outside the United States, our products are sold both directly to international customers and through distributors. International sales accounted for approximately 94%, 91% and 89% of our net revenue in 2004, 2003 and 2002, respectively. We expect international sales to continue to represent a significant portion of product sales for the foreseeable future, as more and more electronics manufacturing is concentrated in the Pacific Rim. On a portion of our sales to international distributors, we offer product return privileges and, if we lower the prices of our products, we guarantee price protection on unsold inventory, which is standard in the semiconductor industry. We defer revenue from this portion of shipments to international distributors until these distributors notify us of product sales to their customers. Some sales to international distributors are below contract pricing and are not guaranteed price protection or return privileges. On these sales, we do not defer revenue.

      During 2004, sales to OEMs represented 86% of our net revenue, and sales through our distribution channel represented 14% of net revenue. While sales to our largest customer pass through an international distributor, we classify these sales as OEM sales since the distributor does not fulfill a traditional distributor stocking role. However, we defer revenue until this international distributor has resold the product to the end customer.

      A relatively small number of large customers have accounted for a significant portion of our net revenue in each of the past several years. During 2004, 2003 and 2002, our top ten customers, excluding domestic distributors, together accounted for approximately 82%, 77% and 79% of net revenue, respectively. During 2004, one customer, Uniden Corporation, accounted for 55% of our total sales and sales to Giant Electronics Limited (a subcontractor for Plantronics, Inc.), our second largest customer, accounted for 10% of our total sales. Seasonal demand characterizes the consumer electronics market, including Uniden’s digital cordless telephones, which incorporate our transceivers. We expect Uniden to continue to account for a significant portion of our sales in 2005. Sales to Uniden are subject to the same seasonality of demand and to all of the inherent variability of the consumer electronics market. We expect that sales to Giant Electronics will also account for a significant portion of our sales in 2005.

      During 2004, 2003 and 2002, all of our net revenue was derived from sales of products for the wireless communications market and the computer networking market. During 2004, 2003 and 2002 wireless shipments accounted for approximately 74%, 64% and 62% of net revenue. Sales of our products to network equipment manufacturers accounted for approximately 26%, 36% and 38% of our net revenue in 2004, 2003 and 2002, respectively.

Backlog

      We do not believe that backlog is a meaningful indicator of our future business prospects, due to the significant percentage of orders received and shipped within the same quarter and the ability of our customers to cancel or reschedule orders outside a thirty-day period without significant penalty.

Technology

      We believe our success and sustainable competitive advantages depend on the acceptance and continued development of our core technologies. Technologies that we believe give us a competitive advantage include:

      We use standard process technologies available from leading semiconductor foundries. Silicon technologies currently used or being implemented in new designs include:

Manufacturing

      We utilize outside foundries for all of our silicon wafer requirements, outside suppliers for both wafer sort and final product test, and outside assembly services to package our products. After assembly, the packaged units are final tested and final inspected by subcontractors prior to shipment to customers. Extensive electrical testing is individually performed on all circuits, using advanced, automated test equipment capable of high volume production, to ensure that the circuits satisfy specified performance levels.

      We believe that using outside foundries and other manufacturing services enables us to focus on our design strengths, minimize fixed costs and capital expenditures, and access diverse manufacturing technologies. We depend on silicon foundries located in the United States, Singapore and Japan for products currently in production as well as those currently being designed. Other manufacturing processes are performed by companies in the United States, Malaysia, Korea, Hong Kong, Singapore, and the Philippines.

Research and Development

      We employ state of the art integrated circuit development software tools in order to shorten development cycles and accurately simulate the performance of our designs before committing to costly and time-consuming silicon fabrication. These tools represent a significant portion of our research and development budget. Our product development strategy focuses on highly integrated silicon solutions, employing a modular design to allow for use in a broad range of applications, enabling us to address multiple markets quickly with similar platforms.

      As silicon technology advances, new processes enable higher levels of performance while existing processes become more cost effective. We watch these trends closely in order to provide the highest performance and most cost effective solutions to our customers.

      In May 2003, we undertook a restructuring that consolidated most of our design activities into our San Jose, California headquarters. Our engineering design center in San Jose is involved in the development of advanced communications circuits and systems for wireless markets. Device validation, characterization,

reliability testing, and automatic test equipment test development activities are also located in San Jose. In addition to our San Jose engineering organization, we also have a small design group in Salt Lake City, Utah.

      Research and development expenses were $9.5 million, $10.0 million, and $15.7 million in 2004, 2003, and 2002, respectively. We reduced engineering headcount as part of our overall restructuring efforts in 2003. In planning these reductions, we carefully reviewed and focused our product roadmap. We expect to continue spending significant funds on research and development activities to deliver leading edge products that have the promise of volume shipments within a short time following their introduction.

Competition

      The semiconductor industry is characterized by price erosion, rapid technological change, short product life cycles, cyclical market patterns and heightened international and domestic competition. The market segments in which we participate are intensely competitive, and many semiconductor companies presently compete, or could compete, in one or more of our target markets. Our principal competitors are National Semiconductor, Infineon, Philips, Texas Instruments, DSP Group, Atheros, and Atmel. Many of our competitors offer broader product lines and have substantially greater financial, technical, manufacturing, marketing and other resources. In addition, many of our competitors maintain their own wafer fabrication facilities, which provide them with a competitive advantage.

      We believe that product innovation, quality, reliability, performance and the ability to introduce products rapidly are important competitive factors. We believe that, by virtue of our product application knowledge and design expertise coupled with a rigorous design methodology, we can compete favorably in the areas of rapid new product introduction, product innovation, quality, reliability and performance. However, we may be at a disadvantage in comparison to larger companies with broader product lines, greater technical and financial resources, and greater service and support capabilities.

      During 2004, we continued to expand our product development partnership with Oki Electric Industry Co., Ltd. We believe that this relationship, as well as other less formal development partnerships that we have recently engaged in, will result in more optimized and complete application-specific radio solutions. The availability of such solutions should result in greater acceptance of our digital wireless products as well as shorter development cycle times for our customers.

      The acceptance of future products will depend on their direct applicability to the intended market, their cost-effectiveness, and the availability of easily implemented systems-level solutions based on these products. Larger competitors with larger development staffs, larger research and development budgets, and access to more technologies could deliver competitive products with improved feature sets, more products with differentiated feature sets and/or complete chipsets or system solutions, thus providing them a distinct competitive advantage.

Patents and Licenses

      Our success depends, in part, on our ability to obtain patents and licenses and to preserve other intellectual property rights covering our products, procedures, development tools and testing tools. To that end, we own certain patents and intend to continue to seek patents on our inventions when appropriate. We own eight U.S. patents, and have nine U.S. patent applications. We own two foreign patents, and have thirteen foreign applications pending. Through a sale of a portion of our assets, we maintain a royalty-free license to forty-five U.S. patents, three foreign patents, seven U.S. patent applications, and three foreign patent applications. We believe that although the patents described above may have value, given the rapidly changing nature of the semiconductor industry, we depend primarily on the technical competence and creativity of our technical workforce.

      We have not currently licensed any third parties to manufacture our products. We have no current plans to grant product licenses with respect to any products; however, we may find it necessary to enter into product licenses in the future. We have granted nontransferable, limited process licenses to each of our foundries to utilize our proprietary processes to manufacture our products.

Employees

      As of December 31, 2004, we had 56 full-time employees, ten of whom were engaged in manufacturing (including test development, quality and materials functions), 29 in research and development, eight in marketing, applications and sales, and nine in finance and administration. Our employees are not represented by any collective bargaining agreements, and we have never experienced a work stoppage. We believe that our employee relations are good.

Available Information

      We are subject to the informational requirements of the Securities Exchange Act of 1934. We therefore file periodic reports, proxy statements and other information with the Securities and Exchange Commission. Such reports may be obtained by visiting the Public Reference Room of the SEC at 450 Fifth Street, NW, Washington, D.C. 20549, or by calling the SEC at 1-800-SEC-0330. In addition, the SEC maintains an internet site (http://www.sec.gov) that contains reports, proxy and information statements and other information regarding issuers that file electronically.

      Our Web site is http://www.microlinear.com. We make available free of charge, on or through our Web site, our annual, quarterly and current reports, and any amendments to those reports, as soon as reasonably practicable after electronically filing such reports with the Securities and Exchange Commission (SEC). Information contained on our Web site is not incorporated by reference unless specifically referenced herein.

      In July 2004, we sold our San Jose facilities for approximately $7.0 million. We recognized a gain on the sale of approximately $1.1 million and the sale generated cash of approximately $4.6 million, net of a $1.9 million mortgage payoff and $0.5 million of closing costs. We have entered into a one year lease agreement with the new owners to lease back a portion of the facilities as we search for a new location for our headquarters. We currently lease 32,000 square feet of space and our lease expires at the end of July 2005. Due to the high vacancy rates for commercial space in the San Jose California area, we do not foresee any difficulty in our ability to find sufficient space at the expiration of our lease.

      From time to time we receive correspondence from vendors, distributors, customers or end-users of our products regarding disputes with respect to contract rights, product performance or other matters that occur in the ordinary course of business. Some of these disputes may involve us in costly litigation or other actions, the outcome of which cannot be determined in advance and may adversely affect our business. The defense of lawsuits or other actions could divert our management’s attention away from running our business. In addition, negative developments with respect to litigation could cause the price of our common stock to decline significantly. There are no lawsuits pending at this time.

      None.

PART II

      The following table sets forth the highest and lowest sale prices of our Common Stock over the last eight quarters, as reported in the Nasdaq National Market. Our Common Stock is listed on the Nasdaq National Market under the symbol “MLIN.”

Common Stock Prices

      We have not paid or declared cash dividends on our Common Stock within the past five years and do not anticipate paying any cash dividends in the foreseeable future. Any determination with respect to the payment of dividends will be at the discretion of our board of directors.

      The information required by this Item is included under Item 12 of Part III of this Report on Form 10-K.

      The following selected consolidated financial data for the five-year period ended December 31, 2004 should be read together with our Consolidated Financial Statements and notes thereto included in Item 8 of this report and “Management’s Discussion and Analysis of Financial Condition and Results of Operations” included in Item 7 of this report.

      The following discussion of our financial condition and results of operations should be read together with the financial statements and related notes included elsewhere in this report on Form 10-K. This discussion contains forward-looking statement, including those discussed in “Forward-Looking Statements”. These statements are subject to risks and uncertainties which may cause actual results to differ materially from those discussed in these statements, including risks and uncertainties discussed under “Factors That May Affect Future Operating Results.”

Overview

      Micro Linear Corporation is a fabless semiconductor company specializing in wireless integrated circuit solutions, which enable a variety of wireless products serving a global market. These transceivers can be used in many streaming wireless applications such as cordless phones, PHS handsets, wireless speakers and headphones, security cameras, game controllers, cordless headsets and other personal electronic appliances. Headquartered in San Jose, California, Micro Linear’s products are available through its authorized representatives and distributors worldwide.

      We were founded in 1983, and until 2000 we were a supplier of advanced analog and mixed signal integrated circuits to the computer, communications, telecommunications, consumer and industrial markets. During 2000, we divested our manufacturing test operation and our non-communication product lines and focused our marketing, engineering and product development on new communications products, including some wired networking products, but most notably wireless integrated circuits. During 2001, we established

ourselves as a volume supplier of RF transceivers to the digital cordless telephone segment of the communications market. Wireless product revenue represented 74% of net revenue for 2004 compared to 64% of net revenue for 2003. We expect the revenue contribution from wireless products to continue to increase as a percentage of total revenue.

      In October 2002, we announced that in order to better align our product development activities with our revenue-producing markets, we would stop development of 802.11a broadband wireless products. The realignment process included redirecting certain engineering activities, and reorganizing sales, marketing and applications to strengthen major account support. As part of the realignment, we reduced our workforce by 39 employees. On May 19, 2003, we undertook a restructuring effort that eliminated approximately 37 additional positions in all operational segments of the Company, and consolidated some functions at our San Jose headquarters.

Opportunities and Challenges

      Our operating results are likely to continue to fluctuate as a result of many factors, including, but not limited to: the level, timing, cancellation or rescheduling of customer orders, changes in market demand, fluctuations in manufacturing yields and cost, market acceptance of our products, economic conditions specific to the networking and wireless industries and markets, and general economic conditions.

      As a result of competitive pricing pressures we may experience lower margins in our wireless products, and we expect these pricing pressures to continue. In addition, the wireless and computer networking markets have undergone a period of rapid growth and consolidation in recent years. Although sales of our legacy networking products continue to decline as expected, we are still dependent on sales to computer network equipment manufacturers to continue. As a result, our business would suffer in the event of a significant slowdown in the networking equipment market. We intend to try to offset this decline in networking revenue by continuing to introduce new wireless products.

      The wireless and computer equipment networking markets in which we compete are characterized by continuing technological advancement, changes in customer requirements, and evolving industry standards. To address these challenges, we must design, develop, manufacture and sell new or enhanced products that provide increasingly higher levels of performance and reliability, are cost effective, and brought to market in a timely manner. Sales to one wireless customer, Uniden Corporation (Uniden), represented 55% of our total revenue during 2004 and we expect will represent a significant portion of our revenue during 2005. We are dependent on our relationship with Uniden and as a result our business would also suffer in the event of a significant slowdown in Uniden’s business.

      Successful engineering development and market penetration in the product areas we have chosen require high levels of engineering and product development expense. We have sometimes experienced delays in completing the development of new products. As we do not currently manufacture our own semiconductor wafers, we are vulnerable to process technology advances competitors use to manufacture products offering higher performance and lower cost.

      To address these challenges, we intend to pursue various opportunities. For example, we intend to continue to spend significant amounts of resources on new product and technology development, predominately wireless semiconductors. We intend to broaden our markets into many streaming wireless applications such as PHS transeivers, wireless speakers and headphones, security cameras, game controllers, cordless headsets and cordless telephones. We also intend to leverage our existing intellectual property in the development of new products to reduce technical risk and development cycle time and to develop customer and strategic relationships in our target markets to strengthen our competitive position.

Critical Accounting Policies

      Management’s Discussion and Analysis of Financial Condition and Results of Operations are based upon our consolidated financial statements, which have been prepared in accordance with accounting principles

generally accepted in the United States. The preparation of these financial statements requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenue and expenses, and related disclosure of contingent assets and liabilities. Management bases its estimates on historical experience and other assumptions that are believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Senior management has discussed the development, selection and disclosure of these estimates with the Audit Committee of our Board of Directors. Actual results may differ from these estimates under different assumptions or conditions. Management believes the following critical accounting policies reflect its more significant estimates and assumptions used in the preparation of our consolidated financial statements.

      Our critical accounting policies are as follows:

      We recognize revenue for product shipped directly to OEM customers at the time of shipment, provided that we have received a signed purchase order, the price is fixed, title has transferred, and collection of the resulting receivable is reasonably assured. Sales to our OEM customers are made without return privileges and revenue on these sales is recognized upon shipment. We defer recognition of revenue from sales of our products to distributors under agreements which allow certain rights of return and price adjustments on unsold inventory. The associated cost of product on these sales to distributors is also deferred and included in our inventory balances. Revenue and cost of product is recognized when the distributor resells the product to its customers. Some sales to distributors are below contract pricing and are not guaranteed price protection or return privileges. On these sales, we do not defer revenue.

      We record estimated reductions to revenue for expected product returns. In determining the amount of the allowance, we analyze historical returns, current economic trends and changes in customer demand and acceptance of our products. There were no allowances for returns recorded at December 31, 2004.

      The preparation of financial statements requires us to make estimates and assumptions that affect the reported amount of accrued liabilities and disclosure of contingent liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reported period.

      We perform ongoing credit evaluations of our customers based on a number of factors, including past transaction history and the creditworthiness of the customer, as determined by an evaluation of the customer’s financial statements, credit rating, bank and credit references. We do not generally require collateral from the customer. For certain international customers, we obtain letters of credit or cash payments in advance of shipment. Allowances for potential credit losses are established based on management’s review of individual accounts. The accounts receivable balance was $2.9 million, net of allowance for doubtful accounts of $139,000, as of December 31, 2004. An unexpected change in a major customer’s ability to meet its obligation could have an adverse material effect on our financial position and results of operations.

      We value inventories at the lower of standard cost or market. Standard costs are adjusted to approximate actual costs on a first-in, first-out basis. The value of inventories is reduced by an estimated allowance for

excess and obsolete inventories. This allowance for excess and obsolete inventories is based upon our review of demand for our products in light of projected sales, current market conditions, and market trends. If a significant, unanticipated decrease in demand for our products or significant technological development occurs, we may deem it necessary to provide for additional inventory reserves, which may have a material adverse impact on our gross margin. For inventory for which a reserve is provided, we do not release the reserve until the inventory is sold or otherwise disposed of.

      As part of the process of preparing the consolidated financial statements, we are required to estimate income taxes in each of the jurisdictions in which we operate. This process involves estimating actual current tax exposure together with assessing temporary differences resulting from differing treatment of items, such as deferred revenue, for tax and accounting purposes. These differences result in deferred tax assets and liabilities, which are included within the consolidated balance sheet. We must then assess the likelihood that deferred tax assets will be recovered from future taxable income or tax planning strategies and to the extent we believe that recovery is not likely, we must establish a valuation allowance. To the extent we establish a valuation allowance or increase this allowance in a period, it is reflected as an expense within the tax provision in the statement of operations.

      Significant management judgment is required in determining the provision for income taxes, deferred tax assets and liabilities and any valuation allowance recorded against net deferred tax assets. We have recorded a full valuation allowance of $15.9 million as of December 31, 2004, due to uncertainties related to the ability to utilize our deferred tax assets, primarily consisting of certain net operating losses carried forward and foreign tax credits, before they expire. The valuation allowance is based on estimates of taxable income by jurisdiction in which we operate and the period over which deferred tax assets will be recoverable. In the event that actual results differ from these estimates or we adjust these estimates in future periods, we may need to establish an additional valuation allowance or release existing allowances, which could materially impact our financial position and results of operations.

      We evaluate the carrying value of long-lived assets in accordance with Statement of Financial Accounting Standards No. 144, “Accounting for the Impairment or Disposal of Long-Lived Assets” (SFAS 144”), which requires that long-lived assets be reviewed for impairment whenever events or changes in circumstances indicate that the book value of the asset may not be recoverable. In the third quarter of 2003, we completed an impairment review of our land and buildings. The review was undertaken due to continued weakness in the commercial real estate markets, local vacancy rates and recent real estate transactions in our local market. Upon completion of our review, we determined that the carrying values of these assets exceeded their future undiscounted cash flows. Accordingly, we recorded an impairment loss of $1.5 million to write down the assets to their current estimated market value. In July 2004, we sold our San Jose facilities for approximately $7.0 million. We recognized a gain on the sale of approximately $1.1 million and the sale generated cash of approximately $4.6 million, net of a $1.9 million mortgage payoff and $0.5 million of closing costs. In fiscal year 2002, we wrote down $0.4 of impaired capitalized software primarily due to the discontinuation of the 802.11a broadband wireless program.

      In December 2004, the FASB issued Statement of Financial Accounting Standards No. 123R (“SFAS No. 123R”), “Share-Based Payment,” an amendment to Statement of Financial Accounting Standards No. 123 (“SFAS No. 123”), “Accounting for Stock-Based Compensation” and Statement on Financial Accounting Standards No. 95, “Statement of Cash Flows.” The revised standard addresses the accounting for share-based payment transactions in which a company receives employee services in exchange for either equity instruments of the company or liabilities that are based on the fair value of the company’s equity instruments or that may be settled by the issuance of such equity instruments. Under the new standard, companies will no longer be able to account for share-based compensation transactions using the intrinsic

method in accordance with APB 25. Instead, companies will be required to account for such transactions using a fair-value method and recognize the expense in the consolidated statement of income. SFAS No. 123R will be effective for periods beginning after June 15, 2005 and allows, but does not require, companies to restate the full fiscal year of 2005 to reflect the impact of expensing share-based payments under SFAS No. 123R. The Company has not yet determined which fair-value method and transitional provision it will follow. Currently, we disclose the pro forma net income (loss) and related pro forma income (loss) per share information in accordance with SFAS 123 and Statement on Financial Accounting Standards No. 148, “Accounting for Stock-Based Compensation Costs — Transition and Disclosure.” We believe that adoption of the new standard will have an adverse impact on our results of operations.

      In November 2004, the FASB issued Statement of Financial Accounting Standards No. 151 (“SFAS No. 151”), “Inventory Costs, an amendment of ARB No. 43, Chapter 4”. SFAS No. 151 clarifies that abnormal inventory costs such as costs of idle facilities, excess freight and handling costs, and wasted materials (spoilage) are required to be recognized as current period charges. SFAS No. 151 will be effective in fiscal years beginning after June 15, 2005. The adoption of SFAS No. 151 is not expected to have a material effect on our financial position or results of operations.

      In December 2004, the FASB issued Statement of Financial Accounting Standards No. 153 (“SFAS No. 153”), “Exchange of Nonmonetary Assets, an amendment of APB Opinion No. 29”. SFAS No. 153 addresses the measurement of exchanges of nonmonetary assets and redefines the scope of transactions that should be measured based on the fair value of the assets exchanged. SFAS No. 153 will be effective for nonmonetary transactions in fiscal years beginning after June 15, 2005. The adoption of SFAS No. 153 is not expected to have a material effect on our financial position or results of operations.

Results of Operations

      We recognize revenue from product shipped directly to OEM customers at the time of shipment. Sales to our OEM customers are made without return privileges. During 2004, our top ten OEM customers collectively accounted for approximately 80% of net revenue. We defer recognition of revenue and costs of our products to distributors until the distributor resells the product to its customers. However, some sales to distributors are below contract pricing and are not guaranteed price protection or return privileges. On these sales, we do not defer revenue.

      Sales to Uniden, our largest customer, pass through an international distributor, and are recognized as revenue upon the distributor’s resale to the end customer. However, these sales are classified as OEM in our percent of net revenue presentation, since the distributor does not fulfill a traditional distributor-stocking role for this customer. In 2004, sales through domestic distributors represented 5% of net revenue. Total international sales through international distributors, exclusive of sales to Uniden, represented 9% of net revenue.