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Boosted voltage supply

  • US 20040036456A1
  • Filed: 06/17/2003
  • Published: 02/26/2004
  • Est. Priority Date: 04/06/1990
  • Status: Active Grant
First Claim
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1. A boosted voltage supply comprising:

  • DC voltage supply providing plural voltage levels;

    a boosting capacitor having first and second terminals; and

    a switching circuit including a first transistor between one level of the voltage supply and the first terminal of the boosting capacitor and a second transistor between the first terminal of the boosting capacitor and a capacitive load, the first transistor and the second transistor being driven by clock signals, the switching circuit alternately connecting the first terminal of the boosting capacitor to the voltage supply and to the capacitive load while alternating the level of the voltage supply connected to the second terminal of the boosting capacitor to pump the voltage on the capacitive load to a boosted voltage level greater than and of the same polarity as the DC voltage supply, the second transistor being fully switched to substantially eliminate a threshold voltage reduction of boosted voltage.

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