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CHOPPER-STABILIZED ANALOG-TO-DIGITAL CONVERTER

  • US 20090079607A1
  • Filed: 09/26/2007
  • Published: 03/26/2009
  • Est. Priority Date: 09/26/2007
  • Status: Active Grant
First Claim
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1. A chopper-stabilized analog-to-digital converter (ADC) comprising:

  • a first modulator that modulates an amplitude of an analog 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 the amplified signal at the clock frequency to produce an output signal;

    circuitry that converts the output signal into a digital value that approximates the analog input signal;

    circuitry that converts the digital value into a reconstructed analog output signal;

    a second modulator that modulates an amplitude of the reconstructed analog output signal at the clock frequency; and

    a feedback path that applies the modulated output signal as a feedback signal to the modulated input signal.

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