Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Patent
1994-08-18
1996-07-09
Cunningham, Terry
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
327543, 327546, 327541, G05F 302
Patent
active
055348173
ABSTRACT:
A voltage generating circuit for providing a prescribed voltage, such as 1/2V.sub.DD of the power source voltage V.sub.DD, wherein the capacity of the current and the response time of the voltage generating circuit is significantly improved. When the output voltage V.sub.OUT of the voltage generating circuit drops suddenly from a reference value 1/2V.sub.DD and goes below the lower limit of an allowable voltage level VM-, an n-type MOS transistor MN5A of an output voltage detecting circuit 14 turns on. The potential of the gate terminal for a p-type MOS transistor MP6A in a digital output circuit 16 is pulled to the level of the output voltage V.sub.OUT via the transistor MN5A that was turned on, and said p-type MOS transistor MP6A is turned on in the saturated area more or less perfectly. By virtue of a large amount of current flowing to the output side of a terminal side, namely the load circuit side, at an appropriate voltage from a power source terminal 18 via p-type MOS transistor MP6A which was turned on in the saturated area, a reduction in output voltage V.sub.OUT is stopped quickly and the output voltage is restored to the normal level within a short time.
REFERENCES:
patent: 4788455 (1988-11-01), Mori et al.
patent: 4812735 (1989-03-01), Sawada et al.
patent: 4893091 (1990-01-01), Lillis et al.
patent: 5264743 (1993-11-01), Nakagome et al.
patent: 5362988 (1994-11-01), Hellums
Sakuta Toshiyuki
Suzuki Tomohiro
Cunningham Terry
Donaldson Richard L.
Guttman David S.
Hitachi , Ltd.
Texas Instruments Incorporated
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