Patent ID: 6657497
Filing Date: 2003-12-02
Classification: H03F

Abstract:
A bi-directional amplifier for amplifying RF signals, said amplifier comprising:a first input port electrically coupled to one end of an RF transmission line; a second input port electrically coupled to an opposite end of the RF transmission line; at least one variable matching network electrically coupled to the transmission line between the first input port and the second input port; at least one amplifying device electrically coupled to the RF transmission line between the first input port and the second input port, wherein the at least one amplifying device amplifies an RF signal applied to either the first input port or the second input port, and wherein the variable matching network provides different impedance matching for the RF signal applied to the first port and the RF signal applied to the second port; and a bias device for providing a bias voltage to the at least amplifying device, said bias device providing a different bias voltage to the RF signal applied to the first input port and the RF signal applied to the second input port.