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High spectral purity digital waveform synthesizer

  • US 5,495,202 A
  • Filed: 06/30/1993
  • Issued: 02/27/1996
  • Est. Priority Date: 06/30/1993
  • Status: Expired due to Term
First Claim
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1. A digital waveform synthesizer comprising:

  • a direct digital synthesizer for providing a digitally synthesized input frequency signal;

    a reference frequency generator for providing a clock signal to the direct digital synthesizer and predetermined frequency reference signals;

    an upconverter and divider circuit coupled to the direct digital synthesizer for upconverting and dividing the synthesized input frequency signal to provide a divided synthesized frequency signal, said upconverter and divider circuit comprising;

    a mixer having an input coupled to the direct digital synthesizer for receiving the synthesized input frequency signal, and having a second input coupled to the reference signal generator for receiving a first predetermined reference frequency signal;

    a bandpass filter coupled to the mixer;

    a divide by N divider circuit, where N is a divide number, coupled to the bandpass filter; and

    a low pass filter coupled to the divide by N divider circuit;

    an output upconverter circuit coupled to the upconverter and divider circuit and to the reference frequency generator for upconverting the divided synthesized frequency signal to provide a desired upconverted synthesized output frequency signal;

    a calibration signal generator coupled in parallel with the upconverter and divider circuit; and

    switching means having inputs coupled to the calibration signal generator and the upconverter and divider circuit and having an output coupled to the output upconverter circuit for switching therebetween to provide for calibration and variable frequency signal sources.

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