Patent ID: 6825725
Filing Date: 2004-11-30
Classification: H03F

Abstract:
A power amplifier circuit comprising:an input port for receiving a RF input signal; an output port for providing a RF output signal therefrom that is an amplified version of the RF input signal; a control port for receiving a control signal; a supply voltage input port for receiving a supply voltage; a temperature sensing circuit for sensing a temperature of the power amplifier circuit and for providing a temperature signal in dependence thereon; a voltage sensing circuit for sensing a potential of a voltage supply and for providing a sense signal in dependence thereon; a first amplification stage having a first gain and for amplifying one of a signal derived from the RF input signal and the RF input signal to form a first amplified signal, the first amplification stage for receiving at least one of the temperature signal and the sense signal and the control signal and for varying the first gain in dependence thereon; and, a second amplification stage having a second gain and for amplifying one of a signal derived from the first amplified signal the first amplified signal, the second amplification stage for receiving at least one of the control signal and the temperature signal and the sense signal for varying the second gain in dependence thereon, the second amplification stage coupled directly to the supply voltage input port.