FSK receiver

Details FSK receiver FSK receiver

1993-04-30

1995-07-25

Chin, Stephen

Pulse or digital communications

Receivers

Angle modulation

375545, H03D 300, H04L 2714, H04L 2708

Patent

active

054369312

ABSTRACT:
An FSK receiver includes an amplifier, a local oscillation circuit, a mixer circuit, a limiter circuit, a demodulation circuit, a current detecting circuit, and a control circuit. The amplifier amplifies a received wave frequency-modulated with a binary digital signal. The local oscillation circuit outputs a local oscillation frequency signal. The mixer circuit mixes an amplified output from the amplifier with the local oscillation frequency signal. The limiter circuit receives a baseband signal component output from the mixer circuit to limit an amplitude. The demodulator samples the binary signal from the limiter circuit with a sampling signal generated by the received wave. The current detecting circuit detects a current flowing in the mixer circuit. The control circuit controls the gain of the amplifier in accordance with an output from the current detecting circuit.

REFERENCES:
patent: 4193034 (1980-03-01), Vance
patent: 4521892 (1985-06-01), Vance et al.
patent: 4866395 (1989-09-01), Hostetter
patent: 4910467 (1990-03-01), Leitch
patent: 5015961 (1991-05-01), Springer et al.
patent: 5029182 (1991-07-01), Cai et al.

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