Internal voltage generators for semiconductor memory device

Details Internal voltage generators for semiconductor memory device Internal voltage generators for semiconductor memory device

2007-01-16

2008-12-23

Chang, Joseph (Department: 2817)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

With specific source of supply or bias voltage

C327S535000, C327S536000, C331S057000, C331S173000

Reexamination Certificate

active

07468628

ABSTRACT:
An internal voltage generator capable of reducing the variation width in the level of an internal voltage VPP, by performing charge pumping only a predetermined number of times in a period where an oscillator driving signal is at a logic HIGH level, and then stopping the charge pumping operation. The oscillator controller generates an oscillation control signal for stopping an oscillation operation of a ring oscillator by using an output signal of a level detector and an output signal of the ring oscillator. The ring oscillator does not generate an oscillation signal at a predetermined time point where an output signal of the level detector is at a HIGH level in response to the oscillation control signal. The charge pump circuit generates an internal voltage by performing a charge pumping operation only predetermined times in response to the oscillation signal, and then stopping the charge pumping operation.

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patent: 6756805 (2004-06-01), Sher et al.
patent: 2006/0097804 (2006-05-01), Im et al.
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patent: 2000-040362 (2000-02-01), None
patent: 1020030037592 (2003-05-01), None
patent: 2001-0029599 (2001-04-01), None

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