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Analog-digital converter with gain adjustment for high-speed operation

  • US 20050237234A1
  • Filed: 02/03/2005
  • Published: 10/27/2005
  • Est. Priority Date: 02/05/2004
  • Status: Active Grant
First Claim
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1. An analog-digital converter comprising:

  • an AD converter circuit converting an input analog signal into a digital value of a predetermined number of bits;

    a DA converter circuit converting an output of said AD converter circuit into an analog signal;

    a first amplifier circuit provided parallel with said AD converter circuit and amplifying said input analog signal by a predetermined gain;

    a subtracter circuit subtracting an output of said DA converter circuit, amplified by a gain practically identical to the gain of said first amplifier circuit, from an output of said first amplifier circuit; and

    a second amplifier circuit amplifying an output of said subtracter circuit and feeding the amplified output back to inputs of said AD converter circuit and said first amplifier circuit.

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