CLASS AB AMPLIFIER WITH RESISTIVE LEVEL-SHIFTING CIRCUITRY

摘要

A class AB amplifier with resistive level-shifting circuitry is described. In one exemplary design, the class AB amplifier includes an input stage, a resistive level-shifting stage, a class AB output stage, and a bias circuit. The input stage receives an input signal and provides a first drive signal. The resistive level-shifting stage receives the first drive signal and provides a second drive signal. The output stage receives the first and second drive signals and provides an output signal. The bias circuit generates a bias voltage for the resistive level-shifting stage to obtain a desired quiescent current for the output stage. In one exemplary design, the resistive level-shifting stage includes a transistor and a resistor. The transistor receives the bias voltage and provides the second drive signal. The resistor is coupled to the transistor and provides a voltage drop between the first and second drive signals.