Voltage boosting circuits having over-voltage protection circuit

Details Voltage boosting circuits having over-voltage protection circuit Voltage boosting circuits having over-voltage protection circuit

1998-04-29

2000-04-18

Tran, Toan

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

With bootstrap circuit

327536, 327537, 327309, 365226, 363 60, 307110, H03K 7162

Patent

active

060520221

ABSTRACT:
Voltage boosting circuits having improved overvoltage protection circuits therein include a first pumping circuit and a second pumping circuit. The first pumping circuit includes comprises a first charge pump having an output coupled to a boosted voltage signal line and an oscillator for driving the first charge pump. The second pumping circuit comprises a second charge pump having an output coupled to the boosted voltage signal line and an active kicker circuit for driving the second charge pump upon receipt of a control signal during an active mode of operation. This control signal may be an address strobe signal, such as a complementary row address strobe signal (RASB). An overvoltage protection circuit is also provided. This overvoltage protection circuit includes a circuit to detect an overvoltage condition if a potential of the boosted voltage signal line exceeds a first threshold and a circuit to block receipt of the control signal by the active kicker circuit if the overvoltage condition is detected. By blocking the control signal, the active kicker circuit which drives the second charge pump can be disabled.

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