Patent ID: 8364433

Claim:
A calibration system adapted to calibrate a resistance capacitance (RC) integrated filter including resistors and capacitors having associated therewith parasitic capacitance wherein the calibration system comprises: a digital calibration circuit that is configured to receive a time constant signal and to generate, based thereon, a control word of ‘N’ number of digital bits, the RC integrated filter having associated therewith a particular resistor capacitor configuration with a time constant, the RC integrated filter configured to vary in response to the control word; and an analog monitor circuit including a monitor capacitance assembly and having associated therewith a monitor capacitance, the monitor capacitance assembly comprising of one or more resistors and one or more capacitors having a configuration as that of the particular resistor capacitor configuration, wherein the analog monitor circuit includes N switches, wherein each switch is controlled by one of the N digital bits of the control word, and wherein each switch is configured to connect or disconnect one or more capacitors of the analog monitor circuit thereby generating a time constant signal that represents the time constant.