Automatically correcting data detection circuit and method for FSK modulated signals
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United States of America Patent
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Mar 5, 1996
Grant Date -
N/A
app pub date -
Nov 30, 1994
filing date -
Nov 30, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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