Circuit for reducing distortion produced by an r.f. power amplifier
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United States of America Patent
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Jun 23, 1992
Grant Date -
N/A
app pub date -
Jan 18, 1991
filing date -
Feb 8, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A high frequency SSB radio transmitter has an envelope amplitude modulator for varying the envelope of an r.f. signal source based on an error signal from envelope detectors detecting the envelope of the input and output waveform. It also has a phase modulator for varying the phase of the input waveform based on differences detected in a second amplitude modulator between the instantaneous phase of the input and output r.f. signal. A signal derived from the error signal controls the second amplitude modulator in a subsidiary feedback loop to maintain the size of the envelopes detected by the detectors the same, in order that a difference amplifier may operate effectively. Rapid discrepancies between the detected envelopes occurring within an envelope can then be corrected by the envelope amplitude modulator.
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