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New Intermediate Frequency Amplifier from Oki Offers Widest Dynamic Gain and Attenuation Range for Rapidly Expanding CDMA Applications.

SUNNYVALE, Calif.--(BUSINESS WIRE)--March 7, 1996--A new high-performance, low-cost adjustable gain control (AGC), 5-V GaAs Intermediate Frequency (IF) amplifier capable of amplifying and attenuating an exceptionally wide range of signals for CDMA radios, cellular, Personal Communications Services (PCS) and spread spectrum applications was introduced today by Oki Semiconductor.

This latest RF product offering from Oki, designated the KGF2441, is a power-efficient device that offers a wide dynamic gain/attenuation range of greater than 90 dB. Currently, most AGC amplifiers can only achieve a dynamic gain/attenuation range of less than 45 dB.

The new product was designed specifically to improve the performance of CDMA radio systems and operates at frequencies in the range of 70 MHz and 250 MHz. It also enhances both transmitting and receiving capabilities in all CDMA-designed systems, including CDMA cellular, PCS, PCMCIA, CDMA wireless LANs and WANs, portable computers with wireless datacom systems, wireless cable TV and VSAT satellite systems.

The introduction of the KGF2441 is further indication of Oki's commitment and ability to offer its customers complete systems solutions for wireless communications applications. The KGF2441 complements Oki's recently introduced 3-V GaAs, RF MMIC and FET products, which are targeted for use in similar systems, including Oki's silicon baseband products.

The KGF2441 is manufactured using Oki's highly successful 0.5 micron high-implant density technology. "This product is a good example of our philosophy of designing and manufacturing products that not only meet the customers' current market requirements but also satisfy the needs of the latest design architectures such as CDMA," commented Dr. Moni Mathew, product marketing manger for Oki's GaAs RF products.

Currently, many AGC amplifiers require both a negative and a positive power supply voltage to attain a wide dynamic range. Oki's KGF2441 is capable of attaining a wide range utilizing a single, positive 5-V power supply. Mathew also noted that many amplifiers are susceptible to overloading as a result of larger signal on the input. "The design characteristics of the KGF2441 permit it to overcome this type of problem," he said.

"Being able to predict and control the gain of the amplifiers also is critically important to ensuring the highest degree of efficiency," noted Mathew. "Today, most amplifiers feature a non-linear control curve, relying on feedback to track the control voltage. With a high gain slope linearity, the KGF2441 is able to both predict and track the control voltage," added Mathew.

The new AGC amplifier takes advantage of the low-distortion characteristics of GaAs technology to combine a wide dynamic range of greater than 90 dB with an IP3 of -4.5 and a noise figure of less than 8 dB. Many AGC amplifiers have a low input impedance, some as low as 50 omega. The input circuitry of Oki's KGF2441 enables an input impedance of 1,000 omega and an output impedance of 250 omega. Consequently, it requires less drive power than most AGC amplifiers.

The KGF2441 is available in an industry standard, 8-pin SOP plastic package. It is currently in full production. Engineering and qualification samples are available immediately. High-volume production (greater than 1,000 pieces) can be scheduled within 14 weeks. The KGF2441 is priced at $4.45 for orders in excess of 1,000 pieces.

Oki Semiconductor, founded in 1977, offers a broad line of VLSI devices for use in computers, EDP, automotive, telecommunications and customer electronic products.

A leader in the field of CMOS memory, gate array and customer structured array ASICs, the company's products also include voice/speech recognition synthesis ICs, microcontrollers and advanced communications devices for wireless and fiber-optic applications. Oki also is at the forefront of packaging technology, providing sophisticated options to its customers.

Headquartered in Sunnyvale, Calif., Oki has manufacturing facilities in Portland, Ore. All Oki manufacturing facilities are ISO 9002-certified. Oki semiconductor is a division of OKI America Inc., a subsidiary of Oki Electric Industry Co. Ltd. -0-

NOTE TO EDITORS: Please direct inquiries to Oki Semiconductor, 785 N. Mary Ave., Sunnyvale, Calif. 94086-2909, ATTN: Lori Higa. For literature requests, call toll-free, 800/OKI-6388 or visit Oki's web page at

CONTACT: Oki Semiconductor

Dr. Moni Mathew, 408/737-6343


Mathews & Clark Communications

Stewart Chalmers, 408/736-1120
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Publication:Business Wire
Date:Mar 7, 1996
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