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Switching power amplifier and method of controlling the same

  • US 8,922,277 B2
  • Filed: 02/25/2013
  • Issued: 12/30/2014
  • Est. Priority Date: 07/16/2008
  • Status: Active Grant
First Claim
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1. A switching power amplifier, comprising:

  • a pulse width modulation (PWM) signal generation unit which converts an input audio signal into a PWM signal having a first carrier frequency;

    an error correction and frequency modulation unit including an operational amplifier which corrects a difference between the PWM signal having first carrier frequency and a power-amplified PWM signal received from a gain-control negative feedback path to generate a corrected PWM signal, and modulates the corrected PWM signal by removing the first carrier frequency component from the corrected PWM signal and adding a second carrier frequency component to the corrected PWM signal; and

    a power amplification unit to amplify a power of the modulated PWM signal from the error correction and frequency modulation unit to the gain-control negative feedback path.

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