Patent ID: 6466094
Filing Date: 2002-10-15
Classification: H01L,H03F

Abstract:
A RF power amplifier circuit, comprising;a transistor having an input terminal, an output terminal and a common element terminal, and further having a common-input capacitance and a common-output capacitance; and an input circuit configured for receiving a RF signal from a RF signal source and for electrically coupling the RF signal source across the respective input and common element terminals of the transistor, the input circuit comprising a first input inductor for coupling the RF signal source to the input terminal and a second input inductor coupling the input terminal to the common element terminal, the input circuit substantially matching an impedance of the RF signal source to both a resistive component and a capacitive reactance of the transistor input, wherein the second input inductor is chosen so that its reactance is substantially the conjugate of the reactance of the common-input capacitance.