Distortion compensation for a microwave amplifier

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

H - Electricity

03

F

330/13, 330/41

H03F 1/32 (2006.01) H03F 1/30 (2006.01) H03F 3/60 (2006.01)

Patent

CA 1201492

-9- DISTORTION COMPENSATION FOR A MICROWAVE AMPLIFIER 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 ? 75% and ? 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/AM) conversion.

468927

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