Switching power amplifier and method of controlling the same
AssigneeSamsung Electronics Co., Ltd.
InventorHae-kwang Park
Life of this patent
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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.
Claims16
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, and
- a 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.
A method of controlling a switching power amplifier, comprising:
- converting an input audio signal into a PWM signal having a predetermined carrier frequency;
- correcting a difference between an audio signal included in the PWM signal and a negative feedback output audio signal to generate a corrected PWM signal;
- removing a high-frequency component from the corrected PWM signal;
- modulating 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
- amplifying a power of the modulated PWM signal.
Dependencies are inferred from the claim text.