Daniel L Fraley

US Patent:

49724401, Nov 20, 1990

Filed:

Sep 23, 1988

Appl. No.:

7/248446

Inventors:

Gregory J. Ernst - Gaithersburg MD
Daniel M. Fraley - Germantown MD

Assignee:

Hughes Aircraft Company - Los Angeles CA

International Classification:

H04L 2503

US Classification:

375 60

Abstract:

Transmitter for transmitting communication traffic via phase modulated carrier signals. The device provides for an efficient amplification of a phase modulated carrier signal using Class C amplifier technology. An envelope function is applied to the carrier signal by modulating the Class C amplifier with a related spectrum-suppressing amplitude envelope signal. Phase distortion accompanying the amplitude modulation of the Class C amplifier is compensated by generating a phase offset for the carrier signal. As each envelope function for suppressing the spectrum is generated, a corresponding phase offset may be applied to the carrier signal, avoiding the consequences of phase shift resulting from amplitude modulating the carrier signal in the Class C amplifier.