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Combined angle demodulator and digitizer

  • US 5,369,404 A
  • Filed: 04/30/1993
  • Issued: 11/29/1994
  • Est. Priority Date: 04/30/1993
  • Status: Expired due to Fees
First Claim
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1. A frequency-to-digital converter that operates on an input signal and generates a digital output signal at an output sample-rate, f, comprising:

  • a modulator loop means for generating a coarsely quantized digital representation of the frequency modulation of said input signal at a modulator loop sample-rate of Nf where N is a positive number, wherein the component of said digital output signal corresponding to quantization error has a spectrum that occupies primarily high frequencies; and

    ,a decimation filter coupled to said modulator loop means, said decimation filter for providing lowpass digital filtering and for reducing the modulator loop sample rate, Nf, to said output sample rate f.

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