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Automatic frequency compensation for pulse width modulated RF level control

  • US 7,626,463 B2
  • Filed: 08/24/2007
  • Issued: 12/01/2009
  • Est. Priority Date: 08/25/2006
  • Status: Active Grant
First Claim
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1. A system for automatically allocating to switching devices an on-time that is proportional to a cycle time, comprising:

  • a voltage controlled oscillator configured to receive a tune voltage and configured to output a first signal having a frequency that corresponds to the tune voltage;

    a charge accumulating circuit;

    a voltage controlled current source configured to receive the tune voltage or a scaled tune voltage and configured to charge the charge accumulating circuit by outputting a current that corresponds to the received tune voltage or the received scaled tune voltage;

    a comparator configured to generate a second signal by comparing a voltage of the charge accumulating circuit to a pre-determined set point; and

    a circuit configured to receive the first signal and the second signal and configured to output a third signal that is a function of the first signal and the second signal,wherein the output of said circuit is coupled to the switching devices.

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