A two- (or multi) stage power 
amplifier receives a variable RF input 
signal, and outputs an optimized. RF output 
signal from, for example, a mobile 
handset. The output 
power level from the 
handset is predetermined, as known in the art, by the received 
control signal from a 
base station. The first power 
amplifier stage amplifies the variable RF input 
signal and outputs an RF signal, Vin, to a 
power detector circuit and an RF signal to the second or next 
amplifier stage. The power detect circuit amplifies the Vin signal and rectifies that signal with a linearly biased 
diode and provides a detect signal to a 
DC to DC converter. The converter responds by providing an optimum 
voltage bias, which is linearly related to the 
DC voltage detect signal from the 
power detector, to the output stage, and, if desired, to the first and / or other stages of the power amplifier that optimizes the output 
power level while meeting the required 
linearity specification. The battery 
current consumption is optimized through this automatic, dynamically control of the supply 
voltage for the power amplifier at each output 
power level through the 
DC to DC converter.