Digital switching amplifier
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United States of America Patent
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Feb 12, 2008
Grant Date -
Sep 14, 2006
app pub date -
Mar 8, 2006
filing date -
Mar 14, 2005
priority date (Note) -
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status (Latency Note)
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Abstract
There is provided a digital switching amplifier capable of enhancing an S/N ratio at the time of a small signal output and reducing current consumption and electromagnetic interference (EMI). The digital switching amplifier according to the present invention is provided with an integrator 11 for integrating an input signal, quantizer 12 for quantizing the output signal of the integrator 11 with resolutions different for each of the predetermined signal regions, pulse width modulator 13 for performing pulse width modulation for each of signals quantized with different resolutions by the quantizer 12 using different proportionality coefficients, switching circuit 14 for providing the load 15 with electrical signals different in value for each of pulse-width modulated signals with different proportionality coefficients by the pulse width modulator 13 in response to the pulse-width modulated signal, and feedback circuit 17 for negatively feeding back the output of the quantizer 12 to the input of the integrator 11.
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