Patent ID: 6927632
Filing Date: 2005-08-09
Classification: H03G

Abstract:
1. A low distortion compression amplifier, comprising: an amplifier circuit having an input and an output, wherein an input signal is received at the input and amplified in accordance with a gain to form an output signal at the output; a comparator circuit operable to receive the output signal and generate a first control signal in response thereto; and a digital gain control circuit coupled to the amplifier circuit, and operable to generate a digital gain control signal based at least in part on the first control signal, and wherein the gain control signal is operable to modulate the gain of the amplifier circuit in a digital fashion, wherein the gain control circuit comprises: a first digital gain modulation circuit operable to generate a first gain control signal for modulating the gain at a first rate or a second rate; a second digital gain modulation circuit operable to generate a second gain control signal for modulating the gain at a third rate or a fourth rate; and a selection circuit operable to select one of the first and second gain control signals as the gain control signal based on a predetermined criteria.