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Current-feedback instrumentation amplifiers

  • US 8,179,195 B1
  • Filed: 01/24/2011
  • Issued: 05/15/2012
  • Est. Priority Date: 01/24/2011
  • Status: Active Grant
First Claim
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1. A current feedback instrumentation amplifier (CFIA) having a differential signal input, a differential feedback input and an output comprising:

  • first and second transconductance amplifiers, each having a differential input and a differential output;

    the first and second transconductance amplifiers having their differential outputs coupled together and to the output of the CFIA;

    first circuitry coupled to the differential signal input and the differential feedback input to periodically swap the differential inputs of the first and second transconductance amplifiers between the differential signal input and the differential feedback input, respectively, at a first frequency.

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