Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Reexamination Certificate
2005-08-16
2005-08-16
Callahan, Timothy P. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
C365S227000
Reexamination Certificate
active
06930535
ABSTRACT:
A high voltage supply circuit and method of supplying a high voltage are disclosed. A second pumping voltage-generating unit, in addition to a primary pumping voltage-generating unit for generating a pumping voltage, is provided. The second pumping voltage-generating unit is operated for a certain time simultaneously with the primary voltage-generating unit when a normal operating mode is switched to an auto-refresh operating mode where current consumption is abruptly increased in order to raise the pumping voltage higher than a target voltage. Therefore, the resulting pumping voltage is prevented from being lower than the target voltage even if the operating mode where current consumption is abruptly increased is entered, and the reliability of the circuit is therefore increased.
REFERENCES:
patent: 6275096 (2001-08-01), Hsu et al.
patent: 6285622 (2001-09-01), Haraguchi et al.
patent: 6320457 (2001-11-01), Yang
patent: 6429725 (2002-08-01), Tanzawa et al.
patent: 6430092 (2002-08-01), Nanba
patent: 6774708 (2004-08-01), Matsui
Callahan Timothy P.
Englund Terry L.
Marshall & Gerstein & Borun LLP
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