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SAR ADC providing digital codes with high accuracy and high throughput performance

  • US 6,958,722 B1
  • Filed: 06/11/2004
  • Issued: 10/25/2005
  • Est. Priority Date: 06/11/2004
  • Status: Active Grant
First Claim
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1. A method of converting a sample of an analog signal to a N-bit digital code, said method being performed in an analog to digital converter (ADC), said method comprising:

  • receiving said sample of said analog signal;

    resolving P most significant bits (MSBs) of said N-bit digital code from said sample using one of a first reference voltage and a second reference voltage, wherein P is less than N; and

    resolving Q bits of said N-bit digital code while using said first reference voltage to generate an equivalent voltage corresponding to said P MSBs and using said second reference voltage to generate an equivalent voltage corresponding to said Q bits,wherein said Q bits form the next MSBs following said P MSBs,further comprising resolving next R bits of said N-bit digital code while using said first reference voltage to generate an equivalent voltage corresponding to both of said P MSBs and said Q bits, and said second reference voltage to generate an equivalent voltage corresponding to said R bits.

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