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Direct digital to analog microwave frequency signal simulator

  • US 5,764,087 A
  • Filed: 06/07/1995
  • Issued: 06/09/1998
  • Est. Priority Date: 06/07/1995
  • Status: Expired due to Fees
First Claim
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1. An apparatus for direct digital-to-analog microwave for narrowband and wideband suppressed spurious frequency signal synthesis, comprising:

  • an oscillator for generating a fixed frequency output selected from a range of discrete frequencies;

    a reference frequency generator connected to said oscillator for stabilizing the fixed frequency output;

    a clock generator connected to said reference frequency generator for producing a clock output with a precise frequency governed by the reference frequency generator;

    a wideband direct digital frequency synthesizer (DDFS) circuit connected to said clock generator for providing fast frequency switching output;

    a narrowband DDFS circuit connected to said clock generator for providing a frequency chirp, phase controlled output;

    a control logic circuit connected to both the wideband DDFS circuit and narrowband DDFS circuit to selectively enable the wideband DDFS circuit and narrowband DDFS circuit and thereby select from a pair of DDFS frequency outputs output respectively from said narrowband DDFS circuit and said wideband DDFS circuit;

    a DDFS spurious reduction circuit connected to said wideband DDFS circuit for reducing spurious response of said frequency output; and

    a microwave frequency converter circuit for expanding the frequency band and up-converting one of said selected DDFS frequency outputs to provide a synthesized microwave output signal therefrom.

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