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Differential charge pump

  • US 9,413,362 B2
  • Filed: 07/01/2013
  • Issued: 08/09/2016
  • Est. Priority Date: 01/18/2011
  • Status: Active Grant
First Claim
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1. A differential charge pump, including:

  • (a) a clock signal having a first phase and a second phase, the second phase being different from the first phase, for controlling charge pumping cycles of the differential charge pump;

    (b) at least two charge pump sections electrically coupled in parallel to an input voltage source separate from the clock signal, wherein each charge pump section generates an output voltage comprising a charge-pumped multiple of an input voltage from the input voltage source, each charge pump section including at least two charge multiplying stages having an input and an output, the input of each charge multiplying stage being switchably coupled to an associated input voltage source separate from the clock signal and the output of each charge multiplying stage being switchably coupled to one of (i) an associated intermediate storage capacitor shared with at least one other of the at least two charge pump sections or (ii) a common terminal storage capacitor, each charge multiplying stage including;

    (1) a fly capacitor having an input and an output;

    (2) a first switch coupled between the input of the fly capacitor and an intermediate node, and coupled to and controlled by a selected one of the first phase or the second phase of the clock signal;

    (3) a second switch coupled between the intermediate node and the output of the fly capacitor, and coupled to and controlled by a selected one of the second phase or the first phase of the clock signal, the selected phase controlling the second switch being different from the selected phase controlling the first switch; and

    wherein the charge pumping cycle in at least a first one of the charge pump sections is initiated on the first phase of the clock signal, and the charge pumping cycle in at least a second one of the charge pump sections is initiated on the second phase of the clock signal, andwherein the intermediate storage capacitors are substantially smaller than corresponding intermediate storage capacitors of a non-differential charge pump outputting the same output voltage.

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