Demodulator with agc circuit for multi-level quadrature...

Details Demodulator with agc circuit for multi-level quadrature... Demodulator with agc circuit for multi-level quadrature...

H - Electricity

03

D

329/11

H03D 3/00 (2006.01) H04L 27/38 (2006.01)

Patent

CA 1214834

ABSTRACT There is disclosed a demodulator with an automatic gain control circuit that comprises first control circuit means for varying an amplitude of a multi-level quadrature amplitude-modulated carrier wave in response to a first control signal; quadrature phase demodulator means for phase-detecting an output of the first control circuit means by reference carrier waves which are different in phase by 90 degrees from each other, and for providing an inphase demodulated signal and a quadrature demodulated signal; first multi- level discriminator means and a second multi-level discriminator means for respectively discriminating the inphase and quadrature demodulated signals with respect to multiple levels and for generating digital outputs; second control circuit means interposed between the quadrature phase demodulator means and the multi-level discriminator means, for varying an amplitude of one of the inphase and quadrature demodulated signals in response to a second control signal; and control signal generator for generating the first and second control signals in response to the outputs of the first and second multi-level discriminator means.

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