Patent ID: 7190213

Claim:
A method of tuning out time constant variations in a network, comprising the steps of: deriving a digital time constant pulse having a width correlated to the nominal time constant of the network; processing the digital time constant pulse through the network and measuring the output voltage waveform of the network; comparing the voltage swing of the output voltage waveform to a predetermined reference voltage during each digital time constant pulse time period; generating a tune signal when the voltage swing of the output voltage waveform does not equal or exceed the level of the predetermined reference voltage, and generating a stop signal when the voltage swing of the output voltage waveform does equal or exceed the level of the predetermined reference voltage; converting the tune signal into a compensation signal for adjusting the time constant of the network; and adjusting the time constant of the network with the compensation signal so that the voltage swing of the output voltage waveform is substantially equal to the predetermined reference voltage.