Patent ID: 7135918

Claim:
A system providing signal power amplification, the system comprising: a power amplifier providing signal power amplification to an input signal to produce an output signal, the power amplifier receiving a power supply signal; a modulator generating a high-power modulated signal as a function of the input signal; and an active compensation circuit converting the high-power modulated signal into the power supply signal and delivering this to the power amplifier through a low impedance output, wherein the modulator produces the high-power modulated signal such that it is substantially proportional to an envelope of the input signal, wherein: the active compensation circuit has a first input accepting a low-power modulated signal that is substantially proportional to an envelope of the input signal and has a second input accepting the high-power modulated signal; the active compensation circuit produces the power supply signal through a low impedance output by applying the power of the high-power modulated signal to the low-power modulated signal.