Patent ID: 8538362

Claim:
A squelch detection circuit comprising: a first comparator coupled to a complimentary input signal pair and having a first polarity output; a second comparator coupled to the complimentary input signal pair and having a second polarity output, wherein an offset associated with the complimentary input signal pair, the first polarity output, and the second polarity output establishes a positive squelch threshold and a negative squelch threshold; and a calibration unit coupled to the first comparator and the second comparator, the calibration unit generating a digital output including threshold settings and calibration settings to the first comparator and to the second comparator, the digital output associated with establishing the offset and with calibrating the positive squelch threshold and the negative squelch threshold, wherein the calibration unit includes a resistor network having a plurality of resistors switchably coupled in parallel, wherein a first subset of the plurality of resistors, when switchably coupled, form the threshold settings and a second subset of the plurality of resistors, when switchably coupled, form the calibration settings.