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High voltage generator with oscillator servo-linked to low supply voltage

  • US 5,821,639 A
  • Filed: 06/17/1996
  • Issued: 10/13/1998
  • Est. Priority Date: 06/21/1995
  • Status: Expired due to Term
First Claim
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1. A switch-over control circuit for a charge pump type of high voltage generator circuit having a set of capacitors and transistors, the switch-over control circuit charging the charge pump by selectively switching the connections between the capacitors and the transistors by issuing piloting signals, the switch-over circuit comprising:

  • an oscillator for producing a clock signal;

    piloting means for receiving the clock signal and producing the piloting signals; and

    command means directing the oscillator to produce the clock signal at a frequency equal to a smallest frequency of a first frequency which is fixed and a second frequency which is dependent on the piloting signals.

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