COMMON-MODE COMPENSATION TECHNIQUE FOR PROGRAMMABLE GAIN AMPLIFIERS

摘要

Certain aspects of the present disclosure provide methods and apparatus for adjusting a bandwidth of an amplifier (e.g., a programmable gain amplifier (PGA)). In certain aspects, the PGA generally includes at least one amplification stage having an input and an output, a plurality of compensation capacitors, and at least one first switch configured to selectively couple at least one capacitor of the plurality of compensation capacitors between the input and the output of the at least one amplification stage. In certain aspects, the amplifier includes at least one second switch configured to selectively couple the at least one capacitor to a node such that the at least one capacitor is coupled to only one of the output or the node, where a voltage at the node is a differential mode (DM) reference potential for the amplification stage.

主权项

1. A programmable gain amplifier (PGA), comprising:
at least one amplification stage having an input and an output; a plurality of compensation capacitors; at least one first switch configured to selectively couple at least one capacitor of the plurality of compensation capacitors between the input and the output of the at least one amplification stage; and at least one second switch configured to selectively couple the at least one capacitor to a node, wherein the at least one capacitor is coupled to only one of the output or the node and wherein a voltage at the node is a differential mode (DM) reference potential for the at least one amplification stage.