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US 2008/0074170 A1Published application
Charge pump circuit control system
AssigneeEtron Technology, Inc.
InventorJen Shou Hsu
Life of this patent
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Abstract
The invention discloses a charge pump circuit control system comprising a level detector, a ring oscillator, and a charge pump circuit. The level detector detects the variation of the output voltage of the charge pump circuit for generating a control signal. The ring oscillator generates a plurality of clocksignals according to the control signal. And the charge pump circuit generates the output voltage according to the plurality of clock signals.
Claims16
A charge pump circuit control system, comprising:
- a charge pump circuit for generating an output voltage;
- a level detector for detecting the output voltage variation and thereby generating a control signal;
- and
- a ring oscillator for generating a plurality of clock signals according to the control signal;
- wherein the charge pump circuit generates the output signal according to the plurality of clock signals and every enabling interval of a first clock signal in the plurality of clock signals is the same.
2 more elements
A ring oscillator for charge pump circuit, comprising:
- a latching node;
- a plurality of serial connected inverters for generating a first output signal and a second output signal wherein a first terminal of the plurality of serial connected inverters is coupled to the latching node and a second terminal of the plurality of serial connected inverters is to generate a feedback signal;
- and
- a latch coupled to the latching node for performing latching operation on a voltage signal of the latching node according to the control signal and the feedback signal;
- wherein the latch performs latching operation on the voltage signal of the latching node when the control signal is at a first voltage level and the latch periodically changes the voltage level of the voltage signal of the latching node when the control signal is at a second voltage level.
2 more elements
Dependencies are inferred from the claim text.