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Title:
VOLTAGE SOURCE CIRCUIT AND TEMPERATURE DETECTION CIRCUIT USING VOLTAGE SOURCE CIRCUIT
Document Type and Number:
Japanese Patent JP2009146021
Kind Code:
A
Abstract:

To provide a higher-accuracy and easy-to-produce voltage source circuit and temperature detection circuit using the voltage source circuit.

A current i1 flows into a source from a drain of a field effect transistor M1, so that a voltage V1 is generated at a non-inverting input terminal of an operational amplifier circuit OP1. The operational amplifier circuit OP1 performs operation control of a field effect transistor M3 such that a voltage V2 of a connection part between a resistor R2 and the field effect transistor M3 becomes equal to the voltage V1, respective currents flowing through a resistor R1 and the resistor R2 become equal, a current i2 equal to the current i1 flows into a drain of a field effect transistor M2, and the field effect transistor M2 generates a gate voltage Vg corresponding to a voltage capable of making the current i2 flow as an output voltage Vpn.


Inventors:
KUBOTA SHINICHI
Application Number:
JP2007320533A
Publication Date:
July 02, 2009
Filing Date:
December 12, 2007
Export Citation:
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Assignee:
RICOH KK
International Classes:
G05F3/24; G01K7/01
Domestic Patent References:
JP2007272914A2007-10-18
JP2005228160A2005-08-25
JP2003197764A2003-07-11
JP2001312320A2001-11-09
JPH045853A1992-01-09
JPH02122315A1990-05-10
JPS58111363A1983-07-02
JP2007187559A2007-07-26
JP2006242894A2006-09-14
JP2005134298A2005-05-26
JP2004239734A2004-08-26
JP2001174338A2001-06-29
JP2007066043A2007-03-15
Attorney, Agent or Firm:
Mitsuo Tanaka
Kyousei Tamura
Masahiro Ishino



 
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