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Charge pump with wide operating range

  • US 9,397,557 B2
  • Filed: 05/15/2014
  • Issued: 07/19/2016
  • Est. Priority Date: 05/15/2014
  • Status: Active Grant
First Claim
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1. A charge pump, comprising:

  • a first current source;

    a first switch, coupled between the first current source and a first node;

    a first level-shift circuit;

    a first capacitor, coupled between the first node and the first level-shift circuit; and

    a second switch, coupled between the first node and an output node, wherein the first switch performs a closing-and-opening operation and the first level-shift circuit performs a level-shift operation while the second switch is kept open;

    a second current source;

    a third switch, coupled between the second current source and a second node;

    a second level-shift circuit;

    a second capacitor, coupled between the second node and the second level-shift circuit; and

    a fourth switch, coupled between the second node and the output node;

    wherein the third switch performs a closing-and-opening operation and the second level-shift circuit performs a level-shift operation while the fourth switch is kept open,wherein the first current source supplies a current to the first node, and the second current source draws a current from the second node.

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