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RAYTHEON, NEW JAPAN RADIO TEAM TO PRODUCE CHIPS FOR SATELLITE TV

 RAYTHEON, NEW JAPAN RADIO TEAM TO PRODUCE CHIPS FOR SATELLITE TV
 ANDOVER, Mass., May 21 /PRNewswire/ -- Raytheon Company's Advanced Device Center (ADC) and New Japan Radio Co., Ltd., (New JRC) have entered into an agreement whereby ADC has started production of downconverter chips for a satellite television application.
 The new chips, which convert microwave frequencies to ultra high frequencies (UHF), will reduce the cost of satellite television receivers. A spokesman for the team pointed out that TV owners in many countries without coaxial cable can access non-government programming only through the use of satellites.
 The spokesman said that if the new components meet specifications, the Raytheon/New JRC team could anticipate orders in the "hundreds of thousands" over the next year for integrated low-noise block, direct broadcasting satellite (DBS) downconverter assemblies manufactured by New JRC.
 The component, jointly developed by Raytheon and New JRC, is a fully integrated package containing a gallium arsenide monolithic microwave integrated circuit (GaAs MMIC) downconverter chip in a hermetically-sealed unit with a self-contained dielectric resonator oscillator (DRO) and oscillator cavity.
 The MMIC chip represents the first high-volume commercial application for Raytheon's ADC. The center, located in Andover, Mass., and formerly a captive, state-of-the-art GaAs MMIC production facility, announced its availability for commercial production development in 1990. The downconverter chip represents its first significant production order for non-military components.
 The MMIC chip itself incorporates several unique features, giving it significant advantages over present hybrid approaches to downconverter design, the spokesman said.
 The heart of the downconverter MMIC is a dual-gate, FET-based broadband mixer which performs the frequency conversion from Ku to L-Band. A unique bias and tuning circuit design allows the mixer to operate over broader bandwidths, with higher gain and lower noise figure than earlier mixer designs.
 The mixer circuit is preceded by a two-stage broadband low-noise amplifier (LNA) and an image-reject filter, and followed by a three-stage intermediate frequency (IF) amplifier.
 Active loads are used extensively to reduce chip size and bias current. The chip reportedly is designed for two RF bands -- 10.5-11.7 gigahertz (GHz) and 11.7-12.7 GHz. Noise figure is specified at a maximum of 6.0 dB with typical performance of 5.0 dB or less and overall gain typically greater than 35 dB. Bias current at 8.0 volts is less than 120 mA.
 The team spokesman said that, while the GaAs MMIC chip could be used independently, its radio frequency and local oscillator interfaces have been optimized for use in the DRO package. Output impedance at the IF port is 75 Ohms.
 Raytheon will market its MMIC chip, while New Japan Radio, based in Kami-Fukuoka City, Japan, will market the downconverter component as a product line. Shipments will start by midyear.
 -0- 5/21/92
 /CONTACT: Dick Sherman of Raytheon, 617-860-2412/
 (RTN) CO: Raytheon Company ST: Massachusetts IN: CPR SU: JVN


SH -- NE003 -- 2685 05/21/92 09:44 EDT
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Date:May 21, 1992
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