Patent ID: 8558609

Claim:
A system for amplifying an input signal to generate an output signal, the system comprising: a current generator configured to receive a first voltage signal, process information associated with the first voltage signal and a first reference signal, and generate a first current signal based on at least information associated with the first voltage signal and the first reference signal; an oscillator configured to receive at least the first current signal and a second reference signal, and to generate a second voltage signal based on at least information associated with the first current signal and the second reference signal, the second voltage signal being associated with a modulation frequency; and a comparator configured to receive the second voltage signal and a third voltage signal, and to generate a modulation signal related to the modulation frequency based on at least information associated with the second voltage signal and the third voltage signal, the third voltage signal being related to at least the input signal, the first voltage signal and a feedback signal, the feedback signal being associated with the output signal; wherein: the first current signal decreases if the first voltage signal increases in magnitude; and the modulation frequency decreases if the first current signal decreases in magnitude.