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Digital intermediate frequency demodulator

  • US 8,451,386 B2
  • Filed: 06/08/2009
  • Issued: 05/28/2013
  • Est. Priority Date: 06/08/2009
  • Status: Active Grant
First Claim
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1. A digital intermediate frequency (IF) demodulator for processing a digital IF signal converted from a radio frequency (RF) signal, comprising:

  • an NCO outputting a sine value and a cosine value;

    a down conversion circuit outputting a first zero IF signal comprising a first real part signal and a first imaginary part signal, according to the digital IF signal, the sine value and the cosine value;

    a PIF carrier recovery circuit outputting a loop error signal for the NCO and a second zero IF signal, according to the first zero IF signal and a video synchronization signal; and

    a video baseband demodulator generating a composite video signal according to the second zero IF signal.

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