Patent ID: 8970308
Filing Date: 2015-03-03
Classification: H03F,H03H

Abstract:
1. A power circuit, comprising: an RF transistor; an input match network coupled to an input to the RF transistor and to an input to the power circuit, the input match network including a resistor, an inductor and a first capacitor coupled together in series between the input to the RF transistor and a ground, and a second capacitor coupled in parallel with at least the resistor, wherein the values of the resistor and the inductor are selected to match an input impedance of the RF transistor to a source impedance at the input of the power circuit over at least a portion of a high frequency range, wherein the value of the first capacitor is selected so that the series combination of the resistor, the inductor and the first capacitor reduce the magnitude of the impedance presented to the input of the RF transistor in a low frequency range relative to the source impedance at the input of the power circuit, wherein the value of the second capacitor is selected so that the resistor is bypassed over at least a portion of the high frequency range.