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Sine wave synthesizer

  • US 4,631,694 A
  • Filed: 04/27/1984
  • Issued: 12/23/1986
  • Est. Priority Date: 04/27/1984
  • Status: Expired due to Term
First Claim
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1. A sine wave synthesizer circuit, comprising:

  • an integrator;

    a plurality of selectable integration constant capacitors;

    decoder means, coupled to said selectable integration constant capacitors, for sequential selection of an integration constant capacitor from among said selectable integration constant capacitors at a rate corresponding to a desired sine wave frequency; and

    switch means for alternately coupling said selected integration constant capacitor between a reference source and said integrator at the same time to produce a first sine wave transition direction and 180°

    out-of-phase to produce a second opposite sine wave transition direction;

    whereby coordinated operation of said decoder means and said switch means operates said integrator to produce a sine wave output signal.

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