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Precision digital pulse phase generator

  • US 5,563,605 A
  • Filed: 08/02/1995
  • Issued: 10/08/1996
  • Est. Priority Date: 08/02/1995
  • Status: Expired due to Term
First Claim
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1. A timing generator, comprising:

  • reference signal means for generating a first digital signal;

    delayed signal means connected to the reference signal means for generating a second digital signal having a controlled variable delay from said first digital signal according to an analog control signal;

    conversion means connected to the reference signal means and the delayed signal means for transforming said first and second digital signals into a pulse-width modulated signal having a common fixed frequency and wherein said pulse-width modulated signal has a variable duty cycle proportional to a difference in timing of said second digital signal to said first digital signal;

    integration means connected to the conversion means for respectively integrating said pulse-width modulated signal into a first analog signal having a magnitude proportional to said duty cycle;

    servo control means connected to receive said integrated analog signals from the integration means and connected to provide said analog control signal to the delayed signal means that is proportional to a difference between said magnitudes of said respective analog signal; and

    a digital-to-analog converter (DAC) connected to receive a digital control code and having an analog output connected to the servo control means that provides for a second analog signal summed with said first analog signal according to said digital control code;

    wherein said digital control code provides for a linear control of the delay of said second digital signal compared to said first digital signal.

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