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Voltage pump with diode for pre-charge

  • US 6,483,378 B2
  • Filed: 09/21/2001
  • Issued: 11/19/2002
  • Est. Priority Date: 07/06/2000
  • Status: Expired due to Term
First Claim
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1. A charge pump comprising:

  • a clock generator for supplying at least one clock signal; and

    at least one charge pump stage, each pump stage comprising, a first boot circuit for supplying a charge pump voltage, said first boot circuit having an input for accepting said at least one clock signal and a first output for providing an increased magnitude voltage;

    an output transistor coupled between said output of said first boot circuit and an output terminal;

    a second boot circuit controlling a gate of said output transistor, said second boot circuit having an input for accepting said at least one clock signal and an second output coupled to the gate of said output transistor, a pre-charge circuit for supplying a pre-charge voltage to said second boot circuit, said pre-charge circuit consisting essentially of a diode coupled between the output of said first boot circuit and the output of said second boot circuit, to permit current to flow from the output of the first boot circuit to the output of the second boot circuit.

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