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Chopper-stabilized instrumentation amplifier for impedance measurement

  • US 9,197,173 B2
  • Filed: 10/14/2009
  • Issued: 11/24/2015
  • Est. Priority Date: 01/31/2007
  • Status: Active Grant
First Claim
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1. A medical device comprising:

  • a current source configured to generate a modulated current at a modulation frequency for application to a load to produce an input signal, wherein the current source comprises a voltage source and a switch that modulates a current produced by the voltage source to produce the modulated current;

    an amplifier configured to amplify the input signal to produce an amplified signal; and

    a demodulator configured to demodulate the amplified signal at the modulation frequency to produce an output signal indicating an impedance of the load.

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