Patent ID: 6677823
Filing Date: 2004-01-13
Classification: H03F,H03G

Abstract:
A gain control circuit arrangement for a power amplifier, the circuit arrangement comprising:(a) a closed loop gain control circuit configured to generate an error signal for controlling the gain of the power amplifier; and (b) a compensation circuit coupled to the closed loop gain control circuit and configured to generate a compensation signal outside of the closed loop gain control circuit that is used to vary the error signal so as to compensate for at least one influence on the gain of the power amplifier that is not accommodated for by the closed loop gain control circuit; wherein the influence comprises a deviation between an initial pain for the Dower amplifier and a desired gain for the power amplifier, and wherein the compensation circuit is configured to output a variable compensation signal having a fixed component based upon the deviation between the initial and desired gains, and a variable component based upon an out-of-loop influence on the gain of the power amplifier.