Miscellaneous active electrical nonlinear devices – circuits – and – External effect – Temperature
Patent
1996-10-24
1998-08-18
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
External effect
Temperature
307651, H03K 522
Patent
active
057962901
ABSTRACT:
A temperature detection circuit using a threshold voltage of a MOSFET with a further improved detection characteristic. The circuit has first and second lateral MOSFETs formed in a well region of a conductivity type which is formed on a surface of a semiconductor region of an opposite conductivity type, a first power source which drives the first lateral MOSFET at an operation point where a temperature has influence on a characteristic between a gate-source voltage and a drain current characteristic thereof, a second power source which drives the second lateral MOSFET at an operation point where the temperature has no influence on a characteristic between a gate-source voltage and a drain current characteristic thereof, and a comparator which compares a difference between outputs from the first and second lateral MOSFETs with a predetermined set value to detect the temperature.
REFERENCES:
patent: 3809929 (1974-05-01), Vittoz
patent: 4937646 (1990-06-01), Tihanyi
patent: 5319268 (1994-06-01), Lyon et al.
patent: 5336943 (1994-08-01), Kelly et al.
patent: 5355123 (1994-10-01), Nishiura
patent: 5357149 (1994-10-01), Kimura
patent: 5629542 (1997-05-01), Sakamoto et al.
Callahan Timothy P.
Luu An T.
NEC Corporation
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