MULTI-STAGE AMPLIFIER WITH PULSE WIDTH MODULATION (PWM) NOISE SHAPING

摘要

A pulse width modulation (PWM) amplifier includes a first amplifier stage, a second amplifier stage, and a gain module. The first amplifier stage is configured to amplify an analog input signal in the analog and digital domains using a first pulse width modulation (PWM) generator, to provide a first stage output for coupling to a load. The gain module is configured to amplify a quantization error of the first PWM generator by a predetermined gain. The second amplifier stage is configured to spectrally shape and attenuate the amplified quantization error of the first PWM generator using a second PWM generator, to provide a second stage output for coupling to the load.

主权项

1. A device comprising:
a first amplifier stage configured to amplify an analog input signal to provide a first output, the first amplifier stage including a first pulse width modulation (PWM) generator; a second amplifier stage having an input based on a signal from the first amplifier stage, the second amplifier stage including a second PWM generator, the second amplifier stage providing a second output; and a signal combination module configured to combine the first and second outputs to provide an output of the device.