Squelch circuitry for high speed high frequency operation

Details Squelch circuitry for high speed high frequency operation Squelch circuitry for high speed high frequency operation

2007-02-20

2007-02-20

Ghayour, Mohammed (Department: 2611)

Pulse or digital communications

Apparatus convertible to analog

Muting circuit and squelch

C455S701000, C455S218000, C455S219000, C455S220000, C455S221000, C455S222000, C455S223000, C455S224000, C455S225000

Reexamination Certificate

active

10327271

ABSTRACT:
A squelch circuit for operating at high speed and at high frequencies includes a squelch input unit, a low swing pre-amplifier and a sampling and decision circuit. The squelch input unit pre-processes the positive and negative signals of an input signal to generate four pre-processed signals that are paired and sent to the low swing pre-amplifier. The outputs of the low-swing pre-amplifier are then over-sampled by the sampling and decision circuit. Multi-phase clocks are used to control the over-sampling in the sampling and decision circuit. A logic circuit then determines if the state of the input signal based on multiple samples.

REFERENCES:
patent: 3633112 (1972-01-01), Anderson
patent: 5303405 (1994-04-01), Simmons et al.
patent: 5436934 (1995-07-01), Co
patent: 5448200 (1995-09-01), Fernandez et al.
patent: 5694088 (1997-12-01), Dickson
patent: 6907096 (2005-06-01), Lueker et al.

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