Differential signal squelch detection circuit and method

Details Differential signal squelch detection circuit and method Differential signal squelch detection circuit and method

2006-10-10

2006-10-10

Nguyen, Duc M. (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Squelch

C455S230000, C455S231000, C455S254000, C455S220000

Reexamination Certificate

active

07120408

ABSTRACT:
An electrical circuit detects a “squelch,” or “out-of-band,” state of a differential signal pair having a positive (“p”) signal line and a negative (“n”) signal line. In one embodiment of the invention, a first and a second comparator each have positive inputs driven by the positive and negative signal lines, respectively. The negative inputs of the comparators are driven by the outputs of separate digital-to-analog converters (DACs) which are set to a lower squelch threshold voltage. The outputs of the comparators then drive the inputs of a logical AND gate, the output of which indicates the current squelch state of the differential signal pair.

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