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Multi-loop .SIGMA. .DELTA. analog to digital converter

  • US 5,982,315 A
  • Filed: 09/12/1997
  • Issued: 11/09/1999
  • Est. Priority Date: 09/12/1997
  • Status: Expired due to Term
First Claim
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1. A sigma-delta analog-to-digital converter comprising:

  • a plurality of loops coupled in cascade, wherein each loop is implemented with multi-sampling circuitry, said multi-sampling circuitry configured to implement filter functions and to sample a respective loop input signal at multiple phases of a clock signal;

    at least one feed-forward gain element, one gain element coupled between each pair of sequential loops; and

    a noise cancellation logic coupled to each of said plurality of loop, said noise cancellation logic providing a converter output.

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