Amplifiers – With plural amplifier channels – Redundant amplifier circuits
Patent
1995-05-25
1996-10-22
Sikes, William L.
Amplifiers
With plural amplifier channels
Redundant amplifier circuits
330107, H03F 368, H03F 136
Patent
active
055680860
ABSTRACT:
A Doherty-type power amplifier suitable for satellite telecommunication systems provides linear amplification of noise-like RF signals that have multiple carriers spread over a large instantaneous bandwidth. Efficiencies of 40% to 50% are achieved using PHEMT devices. The power amplifier includes a carrier amplifier that operates a low power levels and a peak amplifier that operates at high power levels. For low power levels, the carrier amplifier delivers its output into twice the optimum load resulting in high efficiency, while the peak amplifier is turned off. At high power levels, both the carrier and the peak amplifier is working into an optimum load and maximum power is delivered. Output matching sections are used to transform the very low optimum load impedance of the PHEMT devices prior to phase shifting and combining.
REFERENCES:
patent: 2210028 (1940-08-01), Doherty
patent: 3471798 (1969-10-01), Seidel
patent: 4335363 (1982-06-01), Bowers
patent: 4588962 (1986-05-01), Saito et al.
patent: 4590436 (1986-05-01), Butler
patent: 4916410 (1990-04-01), Littlefield
patent: 5017886 (1991-05-01), Geller
patent: 5066925 (1991-11-01), Freitag
patent: 5083094 (1992-01-01), Forsberg
patent: 5166639 (1992-11-01), Green et al.
patent: 5214394 (1993-05-01), Wong
patent: 5264807 (1993-11-01), Okubo
patent: 5420541 (1995-05-01), Upton
patent: 5444418 (1995-08-01), Metzlaff
Three Bazun Designs for Push-Pull Amplifiers Microwave (Jul. 1980) pp. 47-52 vol. 19, No. 7.
Maloney Peter R.
McMorrow Robert J.
Schuss Jack J.
Upton David M.
Gorrie Gregory J.
Motorola Inc.
Nguyen Tiep H.
Sikes William L.
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