ADAPTIVE CONTROL MECHANISMS TO CONTROL INPUT AND OUTPUT COMMON-MODE VOLTAGES OF DIFFERENTIAL AMPLIFIER CIRCUITS

摘要

An amplifier circuit includes differential input nodes, a differential amplifier stage having differential input terminals and differential output terminals, and an input common-mode voltage adaptation circuit connected between the differential input nodes of the amplifier circuit and the differential input terminals of the differential amplifier stage. During an input common-mode adaptation phase, the input common-mode voltage adaptation circuit forces the differential input terminals of the differential amplifier stage to a common-mode voltage equal to an adaptive reference voltage, independent of a common-mode voltage applied to the differential input nodes of the amplifier circuit during the input common-mode adaptation phase. During a normal period of operation of the amplifier circuit, the input common-mode voltage adaptation circuit maintains the common-mode voltage at the differential input terminals of the differential amplifier stage equal to the adaptive reference voltage, independent of an input differential voltage applied during the normal period of operation.

主权项

1. An amplifier circuit, comprising:
differential input nodes comprising first and second differential input nodes; a differential amplifier stage comprising differential input terminals and differential output terminals; and an input common-mode voltage adaptation circuit connected between the differential input nodes of the amplifier circuit and the differential input terminals of the differential amplifier stage, wherein during an input common-mode adaptation phase, the input common-mode voltage adaptation circuit forces the differential input terminals of the differential amplifier stage to have a common-mode voltage equal to an adaptive reference voltage, independent of a common-mode voltage applied to the differential input nodes of the amplifier circuit during the input common-mode adaptation phase, and wherein during a normal period of operation of the amplifier circuit, the input common-mode voltage adaptation circuit maintains the common-mode voltage at the differential input terminals of the differential amplifier stage equal to the adaptive reference voltage, independent of an input differential voltage applied during the normal period of operation.