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DIGITAL FREQUENCY SYNTHESIZER

  • US 3,735,269 A
  • Filed: 10/29/1971
  • Issued: 05/22/1973
  • Est. Priority Date: 10/29/1971
  • Status: Expired due to Term
First Claim
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1. A digital frequency synthesizer comprising:

  • input means for setting a predetermined output frequency and for generating digital signals representing said predetermined output frequency;

    storage means having a plurality of storage locations for storing a plurality of digital values corresponding to at least the magnitude of a plurality of digital samples of the output signal from said synthesizer;

    modulo 10N Accumulator means receiving output signals from said input means for generating successive signals corresponding to respective storage addresses of respective storage locations in said storage means;

    a fixed frequency standard coupled to said accumulator means for causing said accumulator means to generate said successive signals;

    said storage means being responsive at least to the output of said modulo 10N accumulator means for generating output signals corresponding to the digital values stored at the storage locations represented by the address signals coupled thereto from said modulo 10N accumulator means;

    a digital-to-analog converter coupled to the output of said storage means for generating a step-type representation of the output signal from said synthesizer as a function of said samples represented by the output of said storage means; and

    a low pass filter coupled to the output of said digital-toanalog converter and responsive to said step-type representation for generating a smoothed output signal having said predetermined frequency.

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