Amplifiers – Modulator-demodulator-type amplifier
Patent
1993-07-06
1994-08-16
Sikes, William L.
Amplifiers
Modulator-demodulator-type amplifier
375 68, H03F 338, H04L 2704
Patent
active
053390415
ABSTRACT:
A high-efficiency amplifier (10, 18) that may be used in, for example, a radar system to amplify signals received at an exciter (22) before they are applied to an antenna (20). The amplifier includes, among other components, an adaptive matching network (48) that is controlled by a processing system (26) to allow the amplifier to be adaptively matched to the load as the operating frequency of the system undergoes changes. Specifically, the network is adjusted based upon information regarding the ratio R of reflected power over incident power measured at the load the last time the system operated at the same frequency. As a result, the system is able to respond more quickly to frequency changes.
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patent: 4045743 (1977-08-01), Walker
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C. P. Avratoglou et al., "Analysis and Design of a Generalized Class E Tuned Power Amplifier," IEEE Transactions on Circuits and Systems, vol. 36, No. 8, Aug. 1989, pp. 1068-1079.
G. B. Harrold, "Radio-Frequency Amplifiers," Amplifiers and Oscillators, pp. 13-35 through 13-45.
M. K. Kazimierczuk et al., "Class E Tuned Power Amplifier with Antiparallel Diode or Series Diode at Switch, with Any Loaded Q and Switch Duty Cycle," IEEE Transactions on Circuits and Systems, vol. 36, No. 9, Sep. 1989, pp. 1201-1209.
Abraham Fetsum
Sikes William L.
The Boeing Company
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