Dual power amplifier linearizer

摘要

A circuit in a transmitter with multiple power amplifiers includes multiple individual linearizer circuits each receiving a corresponding input signal and each providing a conditioned input signal to a corresponding power amplifier. The linearizer circuit each include: (a) a pre-distortion circuit receiving (i) the corresponding input signal and (ii) the output signal of a corresponding power amplifier, and providing a pre-distortion signal; (b) a cancelation circuit receiving an interfering signal and providing a cancelation signal; and (c) a combination circuit that combines the cancelation signal and the pre-distortion signal to provide a conditioned input signal to the corresponding power amplifier.

主权项

1. A processing circuit for a first power amplifier and a second power amplifier, receiving a first input signal, a second input signal, an output signal of the first power amplifier and an output signal of the second power amplifier, comprising:
a first linearizer circuit that receives the first input signal and the output signal of the first power amplifier; and a second linearizer circuit that receives the second input signal and the output signal of the second power amplifier, wherein the first linearizer circuit and the second linearizer circuit each comprises:
a pre-distortion circuit receiving (i) a corresponding one of the first input signal and the second input signal and (ii) the output signal of a corresponding one of the first power amplifier and the second power amplifier, and providing a pre-distortion signal;a cancelation circuit receiving an interfering signal and providing a cancelation signal; anda combination circuit that combines the cancelation signal and the pre-distortion signal to provide a conditioned input signal to the corresponding one of the first power amplifier and the second power amplifier.