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Variable frequency waveform synthesizer

  • US 4,068,178 A
  • Filed: 10/01/1976
  • Issued: 01/10/1978
  • Est. Priority Date: 10/01/1976
  • Status: Expired due to Term
First Claim
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1. A digital waveform synthesizer repetitively generating a waveform at a desired frequency with each cycle of the waveform being generated as N discrete steps, the synthesizer comprising:

  • a clock generator generating a reference signal at a known frequency;

    a frequency divider circuit coupled to repetitively cycle by counting M cycles of the reference signal where M is an integral number that remains constant for a given desired frequency;

    a decoder coupled to define discrete parts by dividing each cycle of the frequency divider into an integral number of discrete parts and generate a step increment signal for each discrete part, each discrete part corresponding to one of N steps of the synthesized waveform with at least one of the discrete parts having a time duration different than at least one other discrete part during each cycle of the frequency divider; and

    a waveform generator providing a sequence of N discrete waveform signals defining the synthesized waveform;

    the waveform generator being coupled to be incremented in response to the step increment signal for each discrete part provided by the decoder.

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