Procedure and circuit for adaptive compensation of the gain distortions of a microwave amplifier with linearizer
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United States of America Patent
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Jan 28, 1997
Grant Date -
N/A
app pub date -
Jun 6, 1995
filing date -
Dec 23, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
There are described a procedure and circuit for adaptive compensation of the gain distortions caused by thermal drift, ageing, etc., in microwave amplifiers connected to predistortion linearizers. The procedure concerns digitally modulated signals, e.g., QAM, in which the peak to average power signal ratio is constant. Since this ratio remains constant after amplification only if the amplifier is linear, it is measured at the amplifier output, to change the AM/FM distortion characteristic of the linearizer/amplifier chain and hold the ratio on the output equal to that on the input.
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