Patent ID: 6930554
Filing Date: 2005-08-16
Classification: H03F,H03G

Abstract:
1. A variable gain control amplifier operative to produce an output signal in response to an input signal, comprising: an amplifier stage including at least a first intermediate fixed gain stage, operative to produce a first intermediate signal in response to the input signal, and at least a second intermediate fixed gain stage operative to produce the output signal in response to the first intermediate signal; a feedback circuit operative to produce a gain control signal in response to the output signal; and a gain control circuit, operatively coupled to the first intermediate fixed gain stage and the second intermediate fixed gain stage, and operatively responsive to the gain control signal to control an amplitude of the intermediate signal; and wherein the gain control circuit reduces the amplitude of the intermediate signal to decrease a gain of the variable gain control amplifier, and increase the amplitude of the intermediate signal to increase the gain of the variable gain control amplifier.