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Chopper mixer telemetry circuit

  • US 20080269841A1
  • Filed: 04/30/2007
  • Published: 10/30/2008
  • Est. Priority Date: 04/30/2007
  • Status: Active Grant
First Claim
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1. A wireless receiver comprising:

  • a first mixer amplifier that amplifies a telemetry signal modulated at a clock frequency to produce a first amplified signal, demodulates the first amplified signal at the clock frequency to produce a first demodulated signal, and extracts a portion of the first demodulated signal to produce a first output signal;

    a second mixer amplifier that amplifies the telemetry signal to produce a second amplified signal, demodulates the second amplified signal at the clock frequency to produce a second demodulated signal that is approximately 90 degrees out of phase with the first demodulated signal, and extracts a portion of the second demodulated signal to produce a second output signal;

    a first modulator that modulates an amplitude of the first output signal at the clock frequency;

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

    a first feedback path that applies the first modulated output signal as a first feedback signal to the first mixer amplifier;

    a second feedback path that applies the second modulated output signal as a second feedback signal to the second mixer amplifier; and

    circuitry that combines the first and second output signals to produce a third output signal.

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