Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Patent
1996-11-12
1998-02-17
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
327538, G05F 110
Patent
active
057195234
ABSTRACT:
A threshold correcting reference voltage generator in which a capacitor is charged from a first voltage source to a voltage above the desired corrected reference voltage by means of a charging transistor controlled by a clock pulse. A metering transistor has its drain and gate electrodes connected to the capacitor either directly or through a blocking transistor. The source of the metering transistor is connected to a second voltage source which has a value below the desired corrected reference voltage. The charging transistor is then turned off and the blocking transistor, if present, turns on. Charge flows from the source to the drain of the metering transistor, reducing the capacitor voltage until the metering transistor just turns off. At this point the capacitor voltage is higher than the second voltage source by the threshold voltage of the metering transistor. This capacitor voltage is the desired corrected reference voltage; its value depends directly on the magnitude of the metering transistor threshold voltage. Finally the blocking transistor, if present, turns off to isolate the capacitor. The purposes of the blocking transistor are to avoid the direct flow of current between the first and second voltage supplies when the charging transistor is turned on, and to protect the output from errors due to subthreshold conduction in the metering transistor.
REFERENCES:
patent: 3621281 (1971-11-01), Hagen
patent: 4413237 (1983-11-01), Baba
patent: 4649289 (1987-03-01), Nakano
patent: 4728828 (1988-03-01), Goodnough
patent: 4843258 (1989-06-01), Miyawaki et al.
patent: 4947056 (1990-08-01), Jinbo
patent: 5117177 (1992-05-01), Eaton, Jr.
patent: 5164621 (1992-11-01), Miyamoto
patent: 5180928 (1993-01-01), Choi
patent: 5185721 (1993-02-01), Love et al.
patent: 5221863 (1993-06-01), Motegi
patent: 5268871 (1993-12-01), Dhong et al.
patent: 5303191 (1994-04-01), Eagan et al.
Callahan Timothy P.
International Business Machines - Corporation
Murray James E.
Nu Ton My-Trang
Sbrollini Jay P.
LandOfFree
Threshold correcting reference voltage generator does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Threshold correcting reference voltage generator, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Threshold correcting reference voltage generator will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1787076