Patent ID: 7852147

Claim:
An integrated circuit, comprising: a signal-path filter configured to receive an input signal at an input and provide an output signal at an output; a high-pass filter having an input coupled to the output of the signal path filter and an output coupled to the input of the signal path filter, and configured to reduce a direct-current (DC) component of the input signal, wherein the high-pass filter comprises a metal-oxide-semiconductor (MOS) switch, and wherein a corner frequency of the high-pass filter is based on a resistance of the MOS switch; and a control circuit that includes a reference resistor, and is configured to provide a control voltage to the MOS switch that is determined based on a resistance of the reference resistor, and wherein the control voltage determines the resistance of the MOS switch so that the resistance of the MOS switch substantially tracks changes in the resistance of the reference resistor.