Patent ID: 6794937
Filing Date: 2004-09-21
Classification: H03F

Abstract:
A circuit for amplifying a signal, comprising:a power amplifier having an input signal path and an output signal path; and a predistortion linearizer circuit that comprises: a circuit for generating a distorted signal; a coupling circuit, coupled to the circuit for generating a distorted signal, wherein the coupling circuit is capable of introducing a relatively small amount of power from the input signal into the circuit and further capable of reflecting the distorted signal generated by the circuit back onto the input signal path without being physically coupled to the input signal path, and wherein the coupling circuit includes a microstrip having a predefined shape and located a predetermined distance from the signal path leading into the power amplifier such that the relatively stroll amount of power from the input signal is related to the predefined shape of the microstrip and the predetermined distance from the signal path.