Patent ID: 6480798
Filing Date: 2002-11-12
Classification: H03K

Abstract:
A method for independently calibrating a driver in each of a plurality of buffer circuits, said method comprising:providing a first control signal from a central control circuit to a first driver control circuit associated with a first of said plurality of buffer circuits; performing a first calibration operation on a first driver in said first of said plurality of buffer circuits in response to said control signal; providing an first output signal from said first driver control circuit associated with said first of said plurality of buffer circuits when said first calibration operation is complete; inputting said first output signal into a second driver control circuit associated with a second of said plurality of buffer circuits; and performing a second calibration operation on a second driver in said second of said plurality of buffer circuits in response to said output signal; wherein said first and second calibrations each comprise the steps of, utilizing a compare circuit to compare an output of a driver being calibrated to a reference signal to provide a respective result; inputting said respective result to said central control circuit; providing an adjust signal from said central control circuit to a driver control circuit of said driver being calibrated, said adjust signal being based on said result; and adjusting said output of said driver being calibrated in response to said adjust signal.