Charge pump system for non-volatile ram

Details Charge pump system for non-volatile ram Charge pump system for non-volatile ram

G - Physics

11

C

352/41, 352/82

G11C 5/00 (2006.01) G11C 5/14 (2006.01) G11C 11/40 (2006.01) G11C 14/00 (2006.01) H02M 3/07 (2006.01)

Patent

CA 1227572

ABSTRACT CHARGE PUMP SYSTEM FOR NON-VOLATILE RAM A voltage generating system provides a plurality or difference voltages for powering a dynamic nonvolatile random access memory (NVRAM) chip. The voltage generating system includes a pair of charge pumps. Each charge pump is coupled to a controller that senses the voltage level at the output of the charge pump and generates an enabling signal when said voltage is at a predetermined value. The signal activates a power down circuit which adjusts the charge pump output to a desired voltage level. A programmable oscillator provides the clocking signals for the controller. The charge pumps and programmable oscillators are periodically deactivated. As a result, the overall power consumption of the chip is reduced.

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