Squelch detection device

A method, comprising:

• receiving first and second input signals;
• receiving first and second threshold voltage;
• determining a first common mode of the first and second input signals;
• determining a second common mode of the first and second threshold voltage;
• averaging the first common mode with the second common mode to produce an average common mode;
• generating first and second compensated signals from the first and second input signals, respectively, by setting the first common mode of the first and second input signals to the average common mode;
• generating first and second compensated threshold voltages from the first and second threshold voltages, respectively, by setting the second common mode of the first and second threshold voltages to the average common mode;
• and
• determining a state of a squelch signal, indicative of whether the first and second input signals are attributable to noise, based on the first and second compensated signals and the first and second compensated threshold voltages.

A system, comprising:

• a squelch detection device including:
• a first register division operational amplifier configured to receive first and second input signals, determine a first common mode of the first and second input signals, average the first common mode with a second common mode of first and second threshold voltages to produce an average common mode, and generate first and second compensated signals from the first and second input signals, respectively, by setting the first common mode of the first and second input signals to the average common mode;
• a second register division operational amplifier configured to receive the first and second threshold voltages, and generate first and second compensated threshold voltages from the first and second threshold voltages, respectively, by setting the second common mode of the first and second threshold voltages to the average common mode;
• and
• a plurality of amplifiers configured to receive the first and second compensated signals and the first and second compensated threshold voltages and output a squelch signal indicative of whether the first and second input signals are attributable to noise;
• and
• a receiver configured to receive the squelch signal and the first and second input signals and suppress processing of the first and second input signals based on the squelch signal.