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Various embodiments for a low power adaptive charge pump circuit

  • US 6,064,250 A
  • Filed: 07/03/1997
  • Issued: 05/16/2000
  • Est. Priority Date: 07/29/1996
  • Status: Expired due to Term
First Claim
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1. A charge pump for transferring charge to a substrate of a circuit that includes PMOS and NMOS transistors the charge pump comprising:

  • power supply circuit generating at an output a low voltage signal from a power supply voltage, said low voltage signal being approximately equal to the absolute magnitude of the threshold voltage of one of the PMOS transistors plus the threshold voltage of one of the NMOS transistors;

    an oscillator circuit, coupled to the power supply circuit, for generating an oscillator signal at a selected frequency in response to the low voltage signal; and

    pump circuit, coupled to the oscillator circuit, said pump circuit having an output coupled to the substrate, said pump circuit transferring charge to the substrate in response to the oscillator signal.

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