Switching power amplifier and method of controlling the same
First Claim
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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Abstract
A switching power amplifier having a pulse width modulation (PWM) signal generation unit that converts an input audio signal into a PWM signal with a predetermined carrier frequency, a correction unit that corrects the difference between an audio signal included in the PWM signal and a negative feedback output audio signal to generate a corrected PWM signal, a low pass filter that removes a high-frequency component from the corrected PWM signal, a frequency modulation unit that modulates the corrected PWM signal so that the corrected PWM signal has a switching frequency different from the carrier frequency of the input PWM signal to generate a modulated PWM signal, and a power amplification unit that amplifies a power of the modulated PWM signal.
21 Citations
7 Claims
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1. A switching power amplifier, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification