Quadrature modulation circuits and systems supporting...

Details Quadrature modulation circuits and systems supporting... Quadrature modulation circuits and systems supporting...

2006-07-14

2010-06-08

Payne, David C (Department: 2611)

Pulse or digital communications

Transmitters

Amplitude modulation

C375S261000, C375S298000, C375S302000, C375S305000, C375S308000, C332S146000, C332S120000, C327S029000, C327S232000, C327S307000, C327S437000

Reexamination Certificate

active

07733980

ABSTRACT:
A quadrature modulation circuit includes a mixer circuit including an integrated sign modulation control circuit and a plurality of mixer ports. The mixer ports include a first input port, a second input port, an output port and a sign modulation control port. The modulation circuit generates a modulated signal by operation of the mixer circuit multiplying a modulating signal applied to the first input port with a carrier signal applied to the second input port to generate a mixed signal output from the output port, and by operation of the integrated sign modulation control circuit controlling polarity switching of a signal at one of the mixer ports in response to a sign modulation control signal input to the sign modulation control port.

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