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CLASS-D AMPLIFIER CIRCUITS

  • US 20180062593A1
  • Filed: 10/06/2017
  • Published: 03/01/2018
  • Est. Priority Date: 10/23/2013
  • Status: Active Grant
First Claim
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1. A Class-D amplifier circuit for amplifying an input signal comprising:

  • an output stage comprising at least first and second switches;

    a modulator comprising a signal input for receiving said input signal and a clock input for receiving a first clock signal, the modulator being configured to control the duty cycles of said first and second switches within a switching cycle based on said input signal, wherein said switching cycle has a switching frequency based on said first clock signal; and

    a frequency controller for controlling the frequency of said first clock signal in response to an indication of the amplitude of the input signal so as to provide a first switching frequency at a first input signal amplitude and a second, lower, switching frequency at a second, lower, input signal amplitude.

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