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Sigma-delta modulated amplifier

  • US 7,084,799 B1
  • Filed: 06/13/2005
  • Issued: 08/01/2006
  • Est. Priority Date: 05/09/2005
  • Status: Active Grant
First Claim
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1. A sigma-delta modulated audio amplifier including:

  • a local oscillator operable to provide a pseudo-random oscillating signal;

    a summation and integration stage operable to receive an input signal and a feedback signal and to sum and integrate the received signals to provide an integrated signal;

    a quantization stage coupled with the summation and integration stage to receive the integrated signal, the quantization stage operable to quantize the integrated signal to provide a quantized signal;

    a frequency randomized sampling stage coupled with both the quantization stage and the local oscillator to receive the quantized signal and the pseudo-random oscillating signal, the sampling stage operable to provide a sampled signal by utilizing the quantized signal and the oscillating signal;

    an output stage coupled with the sampling stage and operable to amplify the sampled signal to provide an output signal and the feedback signal; and

    an output filter stage coupled with the output stage and operable to provide an audio frequency signal by filtering the output signal.

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