Controlling clipping in a microwave power amplifier

Details Controlling clipping in a microwave power amplifier Controlling clipping in a microwave power amplifier

1990-10-31

1992-12-08

Eisenzopf, Reinhard J.

Telecommunications

Transmitter

Carrier amplitude control

455126, 455127, 330123, 330149, H04B 104, H04B 1112, H03G 320

Patent

active

051704951

ABSTRACT:
In a QAM microwave radio communications system an IF (intermediate frequency) input signal is amplified and predistorted, and the amplified IF signal is mixed with a local oscillator signal to produce an RF (radio frequency) signal which is amplified in a power amplifier for transmission, the predistortion compensating for non-linear gain of the power amplifier. Clipping in the power amplifier is controlled by down-converting part of the RF signal to produce an IF output signal, monitoring amplitude distortion of the RF signal by comparing the IF output signal with the IF input signal, and controlling the IF amplifier gain in dependence upon the monitored amplitude distortion.

REFERENCES:
patent: 3900823 (1975-08-01), Sokal et al.
patent: 4462001 (1984-07-01), Girard
patent: 4618999 (1986-10-01), Watkinson
patent: 4639938 (1987-01-01), Kennett
patent: 4700151 (1987-10-01), Nagata
patent: 4742312 (1988-05-01), Osburn et al.
patent: 4893347 (1990-01-01), Eastmond et al.
patent: 5021753 (1991-06-01), Chapman

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