Patent ID: 7439802
Filing Date: 2008-10-21
Classification: H03F,H03H

Abstract:
1. A unilateral feedback power amplifier comprising: a signal input terminal for receiving a high-frequency signal to be amplified; a power transistor for receiving said high-frequency signal from said signal input terminal and outputting an amplified high-frequency signal; a multi-port feedback circuit connected to an input terminal and an output terminal of said power transistor, said multi-port feedback circuit receiving said amplified high-frequency signal and eliminating the reverse admittance of said amplified high-frequency signal to let the admittance value of the output amplified high-frequency signal approach zero; a signal output terminal for outputting said amplified high-frequency signal processed by said multi-port feedback circuit; and two impedance matching circuits respectively disposed at said signal input terminal and said signal output terminal and used to perform impedance matching to high-frequency signals from said signal input terminal to said signal output terminal.