Three-phase low noise charge pump and method

a charge pump and low noise technology, applied in the field of three-phase low noise charge pump and method, can solve the problems of fast negative-going spike in vout, noise-producing transient process, and problem of internal supply generation through charge pump circuit,
US20070053216A1Active Publication Date: 2007-03-08TEXAS INSTR INC
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
TEXAS INSTR INC
Publication Date
2007-03-08

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Abstract

A low noise charge pump circuit includes a first terminal of a first flying capacitor selectively coupled to a first voltage during a first recharging phase and a second terminal of the first flying capacitor selectively coupled to a second voltage during the first recharging phase. The second terminal of the first flying capacitor is coupled to a precharge control circuit during a first parasitic capacitance precharging phase that occurs after the first recharging phase to cause the voltage of the first terminal of the first flying capacitor to equal an output voltage. The first terminal of the first flying capacitor is coupled to an output conductor conducting the output voltage during a first discharging phase that occurs after the first parasitic capacitance precharging phase. The second terminal of the first flying capacitor is coupled to a discharge control circuit which increases the voltage of the second terminal of the first flying capacitor during the first discharging phase until the output voltage is equal to a regulated value.
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Description

BACKGROUND OF THE INVENTION

[0001] The present invention relates generally to charge pumps, and more particularly to an improvement which provides substantially reduced output noise compared to prior charge pumps.

[0002] On-chip generation of an internal supply voltage at a value greater than the power supply voltage rail VCC has been one approach to providing rail-to-rail operation of an operational amplifier. However, generation of such an internal supply by means of a charge pump circuit has been problematic due to the large amount of output noise (at the charge-pump clock frequency) produced by known charge pumps.

[0003] A standard charge pump circuit is a two-phase circuit including two “flying capacitors” and one “reservoir capacitor” which operate to store and maintain the output voltage of the charge pump circuit. FIG. 1A shows a standard charge pump circuit 1, which includes an amplifying circuit 2 having an output 3 connected to a control terminal of a controlled current s...

Claims

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