Patent ID: 6342810
Filing Date: 2002-01-29
Classification: H03F

Abstract:
An amplifier system, comprising:a data structure that stores sets of compensation parameters; a compensation circuit coupled to an input to the amplifier system, wherein the compensation circuit digitally predistorts an input transmission signal, using sets of compensation parameters selected from the data structure; an amplification chain coupled to an output of the compensation circuit, the amplification chain comprising a power splitter that divides the input transmission signal, following predistortion and radio frequency (RF) upconversion, into a plurality of RF component signals that are amplified by a plurality of respective nonlinear amplifiers and then combined for transmission; and a control module that selectively adjusts states of individual amplifiers of the plurality of nonlinear amplifiers in response to variations in traffic conditions to conserve power during relatively low traffic conditions, such that the amplification chain has multiple operating states in which each operating state corresponds to a particular combination of nonlinear amplifier states; wherein the data structure stores compensation parameter sets separately for each of the multiple operating states of the amplification chain, and the compensation module selects sets of compensation parameters from the data structure for use within the compensation circuit based in part on a current operating state of the amplification chain, such that the input transmission signal is predistorted according to the current operating state.