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Switching power amplifier and method of controlling the same

  • US 8,410,845 B2
  • Filed: 07/16/2009
  • Issued: 04/02/2013
  • 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 to convert an input audio signal into a PWM signal having a predetermined carrier frequency;

    an error correction and frequency modulation unit, comprising;

    an operational amplifier to generate a corrected PWM signal by calculating a difference between the PWM signal and a power-amplified PWM signal received from a gain-control negative feedback path, anda self-oscillating negative feedback path to act together with the operational amplifier to first remove a high-frequency component from the corrected PWM signal to generate a corrected audio signal and then add a new switching frequency component to the corrected audio signal different from the predetermined carrier frequency, thereby generating a modulated PWM signal; and

    a power amplification unit to amplify a power of the modulated PWM signal to be output to the gain-control negative feedback path.

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