Patent ID: 6072361
Filing Date: 2000-06-06
Classification: H03C,H03K

Abstract:
A class-S modulator for amplifying an input signal having envelope information, comprising:a comparator having a first input to receive said input signal, a second input to receive a reference waveform, and differential compared outputs;a differential level shifter having inputs coupled to said differential compared outputs of said comparator, and level shifted outputs;a driver including at least one input coupled to said level shifted outputs, a first differential output, and a second differential output;a switching stage including a high-side switch controlled by said first differential output, and a low-side switch controlled by said second differential output, said high-side and said low-side switches being configured in a totem-pole arrangement to generate a switch output; anda low-pass filter coupled to said switch output to restore an amplified envelope of said input signal.