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CHARGE PUMP AND ACTIVE FILTER FOR A FEEDBACK CIRCUIT

  • US 20120200327A1
  • Filed: 02/03/2011
  • Published: 08/09/2012
  • Est. Priority Date: 02/03/2011
  • Status: Active Grant
First Claim
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1. A circuit comprising:

  • a first charge pump comprising a first pair of switches and a first pair of resistors, a junction of the resistors in the first pair of resistors forming a first node, wherein the first charge pump is operable to source a first current to the first node or to sink the first current from the first node by operation of the first pair of switches;

    a second charge pump comprising a second pair of switches and a second pair of resistors, a junction of the resistors in the second pair of resistors forming a second node, wherein the second charge pump is operable to source a second current to the second node or to sink the second current from the second node by operation of the second pair of switches; and

    a filter comprising an impedance and a first capacitor coupled in series between a third node and a fourth node of the filter, wherein a junction of the impedance and the capacitor forms a fifth node of the filter, wherein the first node is coupled to the third node and the second node is coupled to the fifth node.

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