Demodulator with AGC circuit for multi-level quadrature amplitud

Details Demodulator with AGC circuit for multi-level quadrature amplitud Demodulator with AGC circuit for multi-level quadrature amplitud

1984-03-13

1986-03-04

LaRoche, Eugene R.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329 50, 329132, 455208, 455245, H03D 300

Patent

active

045742464

ABSTRACT:
A demodulator for a multi-level quadrature amplitude-modulated carrier wave includes an AGC amplifier receiving the multi-level quadrature amplitude-modulated wave, the amplifier output being coupled to a quadrature phase demodulator producing an inphase and quadrature-phase demodulated signal. An automatic gain control amplifier receives an output of the quadrature-phase demodulator to compensate for the gain difference between the inphase and quadrature-phase signals. The gain difference compensated inphase and quadrature-phase signals are applied to first and second multi-level discriminators.

REFERENCES:
patent: 4270221 (1981-05-01), Daniel, Jr.
patent: 4476585 (1984-10-01), Reed

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