Patent ID: 6819185
Filing Date: 2004-11-16
Classification: H03F

Abstract:
A bias network for a transistor comprising:an operational amplifier having a first input and a second input; a capacitor, a first end of the capacitor being coupled with an output of the operational amplifier and a second end of the capacitor being coupled with the first input of the operational amplifier; a first resistor, a first end of the first resistor being coupled with the output of the operational amplifier and a second end of the first resistor being coupled to a first terminal of the transistor; and a second resistor, a first end of the second resistor being coupled with the first input of the operational amplifier and a second end of the feedback second resistor being coupled with the first terminal of the transistor; the bias network to detect a change in an average voltage of the transistor and adjust a bias voltage for the transistor in response to the voltage change.