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Digital subharmonic sampling down-converter

  • US 4,888,557 A
  • Filed: 04/10/1989
  • Issued: 12/19/1989
  • Est. Priority Date: 04/10/1989
  • Status: Expired due to Fees
First Claim
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1. A digital subharmonic down-converter, receiving an analog IF signal for providing substantially simultaneous output streams of in-phase I data and quadrature-phased Q data words, comprises:

  • ADC means for converting the analog IF signal, having a frequency fIF, to a stream of digital data samples taken at a sampling frequency fc ;

    digital mixer means for converting the digital data sample stream to a stream of baseband digital data words;

    sorter means for separating interleaved alternating ones of the baseband data words stream into sequential sorted pairs of an in-phase I data word and a quadrature-phase Q data word; and

    means for causing the ADC means sampling frequency fc to be a subharmonic of the IF frequency, with ##EQU2## where n is a selected integer greater than zero.

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