Solid State Amplifier for Spread Spectrum Communications

The report describes development of a CW TRAPATT amplifier designed for use in spread spectrum communication systems. A diamond heat sink, required for high current density CW TRAPATT operation, was developed. The complementary n(+)pp(+) TRAPATT diodes developed exhibited superior performance over o...

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Main Authors: Fong,T T, Ying,R S
Format: Report
Language:English
Subjects:
AVALANCHE DIODES
COMMUNICATION AND RADIO SYSTEMS
Electrical and Electronic Equipment
MICROWAVE AMPLIFIERS
Radio Communications
SOLID STATE ELECTRONICS
SPREAD SPECTRUM
TRAPATT DEVICES
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Ying,R S
description The report describes development of a CW TRAPATT amplifier designed for use in spread spectrum communication systems. A diamond heat sink, required for high current density CW TRAPATT operation, was developed. The complementary n(+)pp(+) TRAPATT diodes developed exhibited superior performance over over their p(+) nn(+) counterpart. A pulsed peak power of 27 W with 42.5 percent conversion efficiency at 7.2 GHz and a CW power of 3 W with 24 percent conversion efficiency at 10.5 GHz were achieved as oscillators. A broadband TRAPATT amplifier was developed which yielded CW power of 4.7 W with 5 dB gain at 8.73 GHz and a DC to RF conversion efficiency of 18.5 percent. The amplifier had a 3 dB instantaneous bandwidth of 4.6 percent. AM and FM noise measurements were performed on this CW amplifier; the AM noise measured in a 1 KHz window was 110 dB below carrier and the FM noise was 100 dB below carrier. Phase linearity was also measured; the rms phase deviation was 4.36 degrees in a 3 dB bandwidth.
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A diamond heat sink, required for high current density CW TRAPATT operation, was developed. The complementary n(+)pp(+) TRAPATT diodes developed exhibited superior performance over over their p(+) nn(+) counterpart. A pulsed peak power of 27 W with 42.5 percent conversion efficiency at 7.2 GHz and a CW power of 3 W with 24 percent conversion efficiency at 10.5 GHz were achieved as oscillators. A broadband TRAPATT amplifier was developed which yielded CW power of 4.7 W with 5 dB gain at 8.73 GHz and a DC to RF conversion efficiency of 18.5 percent. The amplifier had a 3 dB instantaneous bandwidth of 4.6 percent. AM and FM noise measurements were performed on this CW amplifier; the AM noise measured in a 1 KHz window was 110 dB below carrier and the FM noise was 100 dB below carrier. 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source DTIC Technical Reports
subjects AVALANCHE DIODES
COMMUNICATION AND RADIO SYSTEMS
Electrical and Electronic Equipment
MICROWAVE AMPLIFIERS
Radio Communications
SOLID STATE ELECTRONICS
SPREAD SPECTRUM
TRAPATT DEVICES
title Solid State Amplifier for Spread Spectrum Communications
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