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Analog-to-digital converter using digital output as dither

  • US 7,956,783 B2
  • Filed: 06/05/2009
  • Issued: 06/07/2011
  • Est. Priority Date: 01/29/2009
  • Status: Active Grant
First Claim
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1. Apparatus comprising an analog-to-digital converter for converting an analog input signal to a digital output signal, the converter comprising:

  • a. a delta circuit configured to produce a delta output signal based on the analog input signal and an analog feedback signal derived from the digital output signal;

    b. a sigma circuit configured to integrate the delta output signal to form a sigma output signal;

    c. a quantizer circuit configured to produce the digital output signal based on the sigma output signal and a reference signal; and

    d. a feedback circuit configured to modulate the reference signal based on the digital output signal.

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