Circuit and method of digital carrier detection for burst mode communication systems
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United States of America Patent
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-
Mar 30, 1993
Grant Date -
N/A
app pub date -
Apr 27, 1990
filing date -
Apr 27, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A digital squelch circuit for detecting valid data signals in a burst mode communication system, such as a packet-based local area network. Transitions in the input signal to the squelch circuit start a counter which asserts at least one signal a predetermined time from the transition. The absence or presence of the signal when the next transition in the input signal occurs determines if the frequency of the input signal is less than or greater than a frequency related to the predetermined time interval. When a predetermined number of transitions meeting the desired frequency requirement are received, the input signal is judged valid.
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