Linearly regulated voltage multiplier

  • US 5,754,417 A
  • Filed: 10/29/1996
  • Issued: 05/19/1998
  • Est. Priority Date: 10/31/1995
  • Status: Expired due to Term
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First Claim
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1. A charge pump circuit having an input terminal for receiving a supply voltage and an output terminal for providing a boosted voltage with respect to the supply voltage, the charge pump circuit comprising:

  • a charge transfer capacitor having first and second terminals;

    a first switch connected between the first terminal of the charge transfer capacitor and the input terminal;

    a charge storage capacitor connected between the output terminal and a first voltage reference;

    a second switch connected between the first terminal of the charge transfer capacitor and the output terminal;

    a first resistor connected to the output terminal; and

    an error amplifier including;

    an operational amplifier having a first input terminal coupled to the output terminal of the charge pump circuit, a second input terminal coupled to a second voltage reference, and an output line connected solely to the second terminal of the charge transfer capacitor and not directly connected to any other components; and

    a single feedback loop comprising the charge transfer capacitor, the second switch, and the first resistor connected between the first input terminal and the output line of the operational amplifier, the operational amplifier and the single feedback loop forming an integrator to integrate a difference between the second voltage reference and a voltage at the first input terminal of the operational amplifier based on the boosted voltage.

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