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Programmable gain instrumentation amplifier having improved dielectric absorption compensation and common mode rejection ratio

  • US 20050088229A1
  • Filed: 12/21/2004
  • Published: 04/28/2005
  • Est. Priority Date: 08/16/2004
  • Status: Active Grant
First Claim
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1. An instrumentation amplifier for use in a measurement device, the instrumentation amplifier comprising:

  • a negative input terminal;

    an output terminal;

    a first op-amp comprising a noninverting input terminal, an inverting input terminal, and an output terminal, wherein one of the input terminals of the first op-amp is coupled to the negative input terminal of the instrumentation amplifier;

    a current-to-voltage (I-V) converter comprising a first input terminal, a second input terminal, and an output terminal, wherein the output terminal of the I-V converter is coupled to the output terminal of the instrumentation amplifier;

    a first dielectric absorption (DA) compensation circuit coupled to the output terminal of the first op-amp, wherein the first DA compensation circuit is operable to generate a first DA compensation signal which is derived from an input step signal received at the negative input terminal of the instrumentation amplifier; and

    a second DA compensation circuit coupled to one of the input terminals of the I-V converter, wherein the second DA compensation circuit is operable to generate a second DA compensation signal and provide the second DA compensation signal to the I-V converter;

    wherein the first and second DA compensation signals are operable to reduce dielectric absorption and improve a step response of the instrumentation amplifier.

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