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 to convert an input audio signal into a PWM signal having a predetermined carrier frequency;
a correction unit to correct a 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 to remove a high-frequency component from the corrected PWM signal to generate an output audio signal;
a frequency modulation unit to modulate 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 to amplify a power of the modulated PWM signal.
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Accused Products
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.
58 Citations
21 Claims
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1. A switching power amplifier comprising:
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a pulse width modulation (PWM) signal generation unit to convert an input audio signal into a PWM signal having a predetermined carrier frequency; a correction unit to correct a 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 to remove a high-frequency component from the corrected PWM signal to generate an output audio signal; a frequency modulation unit to modulate 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 to amplify a power of the modulated PWM signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of controlling a switching power amplifier, comprising:
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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. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A switching power amplifier comprising:
a digital signal generation unit to convert an input pulse code modulation (PCM) signal into a pulse width modulation (PWM) signal, the digital signal generation unit comprising; an upsampling unit to upsample the input PCM signal; a sample transformation unit to transform the upsampled input PCM signal into a transformed PCM signal having a carrier frequency; a noise shaping unit to remove a quantization noise component of the transformed PCM signal from an audible band; and a PWM unit to convert the transformed PCM signal into a PWM signal having the carrier frequency. - View Dependent Claims (18)
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19. A switching power amplifier comprising:
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a signal generation unit to convert an input pulse code modulation (PCM) signal into a pulse width modulation (PWM) signal having a predetermined frequency; a frequency modulation unit to remove the carrier frequency from the PWM signal and to add a switching frequency to the PWM signal; and an amplifier to amplify a power of the PWM signal at the switching frequency to generate the amplified signal. - View Dependent Claims (20, 21)
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Specification