Spansion Llc.

Kuan-Cheng Tang

Chin-Ghee Ch'ng

Systems and methods for improving efficiency of a voltage booster for read mode operations of memory cells and discharging a boosted supply voltage safely are disclosed. The system contains a plurality of boosting stages coupled in series including a plurality of boosting capacitors, a plurality of isolators. The isolator can be used to prevent boosting of one capacitor from negatively affecting a charge of the other adjacent capacitor to improve the efficiency of the voltage booster. A voltage booster circuit can accurately boost a supply voltage with a suitable number of boosting stages depending on a level of the supply voltage being provided. Since boosters contain a suitable number of boosting stages, the boosters can discharge a boosted voltage sequentially. With this sequential discharge method, memory cells can not have a hot switching problem.

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Penang, Malaysia

Kuan-Cheng Tang