Patent ID: 8427239
Filing Date: 2013-04-23
Classification: H03F,Y10T

Abstract:
1. An amplifier comprising: an impedance matching stage coupled to an input of the amplifier, an output of the impedance matching stage providing an input bias voltage for the impedance matching stage; a feedback circuit coupled to the output of the impedance matching stage and a first voltage source, the feedback circuit providing a compensated operating voltage for the impedance matching stage; and a gain stage coupled to the input of the amplifier, the output of the impedance matching stage providing an input bias voltage for the gain stage; wherein an output of the gain stage and the output of the impedance matching stage are used to produce an output of the amplifier, and wherein the feedback circuit comprises an amplifier circuit, the output of the impedance matching stage being coupled to an inverting input of the amplifier circuit, the first voltage source being coupled to a non-inverting input of the amplifier circuit and an operating bias voltage for the impedance matching stage being set based on the output of the amplifier circuit.