Patent ID: 6703908
Filing Date: 2004-03-09
Classification: H03H

Abstract:
Apparatus for controlling the impedance of an output driver on an integrated circuit (â€œICâ€ ) device comprising:a resistor divider network formed with the output driver and a resistor, the resistor being off the IC device so that the resistor divider network produces an output voltage, a comparing circuit producing a signal indicative of a comparison of the output voltage of the resistor divider network with a reference voltage, a control circuit producing one or more control signals wherein the control signals adjust the output impedance of the output driver to attempt to match the output voltage of the resistor divider network and the reference voltage, and wherein the comparing circuit includes components that over-sample the divider network voltage, store the results of the over-sampling, repeats the over-sampling and storing, and averages the results of multiple over-sampling operations.