| 摘要 |
A Class-D amplifier system may include an input stage that includes an N<SUP>th </SUP>order filter, where N>1. The input stage filters an input signal to provide a filtered output signal, an input of the input stage being configured to receive the input signal as a digital pulse-width-modulated (PWM) signal. A comparator provides a quantized output signal based on the filtered output signal. An output stage is connected between a first voltage rail and a second voltage rail. The output stage provides a switching output signal at an output that varies between the first voltage rail and the second voltage rail based on the quantized output signal. A feedback path connects the output of the output stage with the input of the input stage, such that the N<SUP>th </SUP>order filter compensates for variations in at least one of the first voltage rail and the second voltage rail.
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