Audio switching amplifier

摘要

A switching amplifier includes a compensation circuit to compensate for DC offset in the amplifier, to enhance operation of the switching amplifier. The compensation circuit may comprise a SAR ADC, where the DAC element can be used to provide a compensation voltage. The switching amplifier may further include a PWM modulator configured to avoid cross-talk to further enhance operation of the switching amplifier.

主权项

1. An amplifier circuit comprising:
an input integrator circuit having an input part and an output part; a pulse width modulation (PWM) modulator; a driver circuit connected to the PWM modulator, the driver circuit having first and second outputs for connecting to a load; and a compensation circuit having an input and an output, the input part of the input integrator circuit connected to the output of the compensation circuit and selectively connectable to a signal source, the output part of the input integrator circuit selectively connectable to either the PWM modulator or the input of the compensation circuit.