Patent ID: 7250805

Claim:
A method for multiplexing using a plurality of differential amplifiers each of which includes a differential pair of input terminals, a differential pair of transistors, and a differential pair of output terminals, the method comprising: (a) accepting, at the differential pair of input terminals of each differential amplifier, a corresponding pair of voltage input signals; (b) accepting selection of only one of the differential amplifiers at a time and deselecting the other differential amplifiers; and (c) for each differential amplifier (c.1) presenting substantially unmodified versions of the corresponding pair of voltage input signals to control terminals of the corresponding differential pair of transistors, when the differential amplifier is selected; and (c.2) producing rejection voltage signals of substantially equal magnitude and opposite polarity to the corresponding pair of voltage input signals in order to reject the corresponding voltage input signals and thereby present substantially constant voltages at control terminals of the corresponding differential pair of transistors regardless of variations in the corresponding voltage input signals, when the differential amplifier is deselected.