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Segregated spectrum RF downconverter for digitization systems

  • US 5,602,847 A
  • Filed: 09/27/1995
  • Issued: 02/11/1997
  • Est. Priority Date: 09/27/1995
  • Status: Expired due to Term
First Claim
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1. An apparatus for digitizing an electromagnetic input signal having frequency components within at least first and second segregated frequency bands, comprising:

  • a filtering circuit arrangement for passing only frequency components of said input signal substantially within said first and second frequency bands to provide a filtered signal having a spectrum with spectral components below a predetermined power level within a frequency gap between said first and second frequency bands; and

    an analog to digital (A/D) converter for sampling said filtered signal at a sampling rate sufficient to provide a digitized output signal having a frequency spectrum including spectral components of said filtered signal at corresponding frequencies thereof, and with a replica of spectral components of one of said frequency bands appearing within said frequency gap.

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