Patent ID: 8115552
Filing Date: 2012-02-14
Classification: H03F,H03G

Abstract:
1. An amplifier system comprising: an amplifier having an input and an output, and a bias circuit; a passive feedback circuit comprising only passive elements connecting the output to the input; and a control circuit connected to the bias circuit, wherein the amplifier has a first transistor coupled between the input and the output; and wherein the bias circuit is connected between the input and a bias node; and wherein the control circuit is connected to the bias node, wherein the passive feedback circuit comprises a first resistor and a first capacitor coupled in series and a second resistor and a second capacitor connected in series and in series with the first resistor and the first capacitor, with the first capacitor connected to the input and the first resistor connected to the second resistor, and with the second capacitor connected to the output; and a third resistor connecting to the junction of the first resistor and the second resistor to ground.