Amplifier having frequency compensation by gain degeneration

摘要

An amplifier having an inverting and a non-inverting input and at least one output is compensated by dynamically varying the transconductance of a gain stage in accordance with the gain of the output stage of the amplifier. The amplifier comprises a gain section having at least one output, where a gm of the gain section varies with a transconductance control signal. The amplifier further comprises an output stage comprising a output drive device controlled by an output of the gain section. A bias control circuit is coupled to drive the transconductance control input of the gain section, the bias control circuit increasing a differential mode transconductance of the first gain stage when the active pullup or pulldown output drive device has low gain.