Class-D amplifier circuits

  • US 10,171,049 B2
  • Filed: 10/06/2017
  • Issued: 01/01/2019
  • 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 clock signal; and

    a frequency controller configured to control the frequency of said first clock signal in response to an indication of amplitude of the input signal;

    wherein the frequency controller is configured to implement a transition in frequency of said first clock signal from a first switching frequency to a second switching frequency over a period of time, such that the rate of change of switching frequency with time is variable during said transition.

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