Distortion compensation for a microwave amplifier

Details Distortion compensation for a microwave amplifier Distortion compensation for a microwave amplifier

1983-12-23

1985-07-30

Mullins, James B.

Amplifiers

Hum or noise or distortion bucking introduced into signal...

330277, 330290, 330296, H03F 132, H03F 316

Patent

active

045324778

ABSTRACT:
Amplifier-produced distortion known as amplitude modulation to phase modulation (AM/PM) conversion is reduced through the use of GaAs FETs which are biased to generate AM/PM having an algebraic sign opposite to that generated by the amplifier. This algebraic sign reversal is accomplished by biasing the GaAs FETs so that a DC drain current .ltoreq.75% and .gtoreq.10% of the short-circuit drain current is established. In the disclosed embodiment, several GaAs FETs are cascaded in alternation with attenuators to increase the magnitude of the compensating AM/PM conversion without generating substantial amplitude modulation to amplitude modulation (AM/PM) conversion.

REFERENCES:
patent: 3755754 (1973-08-01), Putz
patent: 4068186 (1978-01-01), Sato et al.
patent: 4283684 (1981-08-01), Satoh
patent: 4465980 (1984-08-01), Huang et al.

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