Electricity: power supply or regulation systems – Self-regulating – Using a three or more terminal semiconductive device as the...
Reexamination Certificate
2011-03-29
2011-03-29
Choi, Jacob Y (Department: 2821)
Electricity: power supply or regulation systems
Self-regulating
Using a three or more terminal semiconductive device as the...
C315S307000, C327S538000
Reexamination Certificate
active
07915883
ABSTRACT:
In a constant current circuit that supplies a constant current Ic to a circuit connected to a current output terminal, the first transistor M1is disposed on a current path of the constant current Ic. The second transistor and the first transistor have commonly connected gate terminals which are control terminals. The first current-voltage converting unit converts the current Im2flowing through the second transistor into a voltage. A constant current source generates a reference current Iref. The second current-voltage converting unit converts the reference current into a voltage. Into the first error amplifier, voltages Vx1, Vx2are input, so as to adjust the gate voltage of the first and second transistors. A voltage adjusting unit adjusts the voltage at the gate terminal of the third transistor so that the voltage at one end of the second transistor will be approximated to a predetermined reference voltage.
REFERENCES:
patent: 5861681 (1999-01-01), Nakano et al.
patent: 6956408 (2005-10-01), Schrodinger et al.
patent: 6975162 (2005-12-01), Tamura et al.
patent: 6980181 (2005-12-01), Sudo
patent: 7609098 (2009-10-01), Bergmann
patent: 61-18231 (1986-01-01), None
patent: 4-86907 (1992-03-01), None
patent: 2004-22929 (2004-01-01), None
patent: 2004-248014 (2004-09-01), None
Chinese Office Action for Chinese Patent Application No. 200680001512.3 issued Mar. 27, 2009 with English Translation.
International Search Report for International Application No. PCT/JP2006/300699 mailed Feb. 21, 2006.
International Preliminary Report on Patentability for International Application No. PCT/JP2006/300699 mailed Jul. 24, 2007.
Chinese Office Action for Chinese Application No. 200680001512.3 issued Sep. 19, 2008 with English Translation.
Japanese Office Action for Japanese Patent Application No. 2005-012986 dispatched Oct. 12, 2010 with English translation.
Alemu Ephrem
Cantor & Colburn LLP
Choi Jacob Y
Rohm & Co., Ltd.
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