Patent ID: 6750722
Filing Date: 2004-06-15
Classification: H03F

Abstract:
An integrated circuit comprising:a power amplifier having a base; an emitter and a collector; a bias control circuit controlling a current supplied to the base of the power amplifier; and a reference device having a base, a collector and an emitter wherein the base of the reference device is isolated from the base of the power amplifier; wherein, the bias control circuit comprises an operational amplifier having a first input, a second input and an output and a voltage to current converter having a source input, a control input and an output; and the first input of the operational amplifier is connected with the base of the reference device, to the output of the voltage to current converter and to the collector of the reference device, the second input of the operational amplifier is connected to the output of the operational amplifier and with the base of the power amplifier.