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Chopper-stabilized instrumentation amplifier

  • US 7,385,443 B1
  • Filed: 01/31/2007
  • Issued: 06/10/2008
  • Est. Priority Date: 01/31/2007
  • Status: Active Grant
First Claim
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1. A chopper-stabilized instrumentation amplifier comprising:

  • a first modulator that modulates an amplitude of an input signal at a clock frequency to produce a modulated signal;

    a mixer amplifier that amplifies the modulated signal to produce an amplified signal and demodulates an amplitude of the amplified signal at the clock frequency to produce an output signal;

    an input capacitor that couples the modulated signal to an input of the mixer amplifier;

    a second modulator that modulates an amplitude of the output signal at the clock frequency to produce a modulated output signal; and

    a feedback path that applies the modulated output signal as a feedback signal to the modulated signal at a node between the input capacitor and the input of the mixer amplifier via a feedback capacitor.

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