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Converter and method for converting an analog signal and comparator for use in such conversion

  • US 7,468,688 B2
  • Filed: 09/06/2006
  • Issued: 12/23/2008
  • Est. Priority Date: 09/06/2006
  • Status: Active Grant
First Claim
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1. A converter comprising:

  • an input terminal receiving a first analog signal;

    a digital-to-analog converter to provide second analog signals related to digital values applied to the digital-to-analog converter;

    a comparator, receiving the first and second analog signals, the comparator comprising a variable-gain amplifier to provide an output signal based on a difference between the first and second analog signals;

    a state machine receiving the output signal of the comparator and generating the digital values applied to the digital-to-analog converter based on the output signal of the comparator; and

    a controller for selectively setting the gain of the variable-gain amplifier, wherein the variable-gain amplifier comprises a switch connected between a first and second output of the variable-gain amplifier.

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