Automatically correcting data detection circuit and method for F

Details Automatically correcting data detection circuit and method for F Automatically correcting data detection circuit and method for F

1994-11-30

1996-03-05

Grimm, Siegfried

Demodulators

Frequency shift keying or minimum shift keying demodulator

Input signal combined with local oscillator or carrier...

375327, 375334, H04L 27152

Patent

active

054971217

ABSTRACT:
A data detection circuit (30) for automatically adjusting to an FSK modulated signal to set a proper trip point for differentiating logic high and low. The detection circuit (30) includes: A demodulator (32) which converts a received FSK modulated signal to voltage levels corresponding to respective frequencies of the modulated signal. A voltage clamp circuit (42) which samples and stores a voltage level of the output of the demodulator (32) and provides a trip point voltage level representing a sum of the stored voltage level and a fixed voltage offset. A comparator (50) which compares the trip point voltage to the voltage levels at the output of the demodulator (32) to provide a logic output signal representing detected digital data signals.

REFERENCES:
patent: 4488120 (1984-12-01), Carsten

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