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System and method for reducing power dissipation in an analog to digital converter

  • US 7,821,436 B2
  • Filed: 06/09/2007
  • Issued: 10/26/2010
  • Est. Priority Date: 06/08/2006
  • Status: Expired due to Fees
First Claim
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1. A method for reducing power dissipated in an analog to digital converter (ADC) comprised of a plurality of clock phases, each clock phase comprising an amplifying phase and a sample-and-hold phase for respectively amplifying and sampling an analog input signal, comprising the steps of:

  • (a) receiving, in a current amplifying phase, a residue value output from a residue amplifier in a previous clock phase; and

    (b) amplifying said residue value during said current amplifying phase, thereby eliminating a load effect on said residue amplifier;

    (c) driving a large load on the residue amplifier and increasing a feedback factor in the sample-and-hold phase and eliminating the sampling capacitance of a previous stage during a sample-and-hold phase, thereby eliminating a low feedback factor; and

    (d) outputting the residue value from the residue amplifier at the termination of a sample-and-hold phase, the residue value being derived from said sampled analog input signal.

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