Circuit and method of digital carrier detection for burst mode c

Details Circuit and method of digital carrier detection for burst mode c Circuit and method of digital carrier detection for burst mode c

1990-04-27

1993-03-30

Kuntz, Curtis

Pulse or digital communications

Spread spectrum

Direct sequence

455223, 328109, H04B 110

Patent

active

051990490

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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"DP83922 Twisted Pair Transceiver Interface (TPI)", National Semiconductor, Dec. 1989, pp. 1-15.

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