Miscellaneous active electrical nonlinear devices – circuits – and – External effect – Temperature
Reexamination Certificate
2005-04-19
2005-04-19
Callahan, Timothy P. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
External effect
Temperature
C327S513000, C327S083000, C327S138000
Reexamination Certificate
active
06882213
ABSTRACT:
A temperature detection circuit comprises an OP amp, a reference current generator, a temperature detection voltage generator, a comparator, and a band gap reference voltage generator. The OP amp receives a band gap reference voltage and a first voltage. The reference current generator generates the first voltage and a reference voltage in response to an output signal of the OP amp. The temperature detection voltage generator generates a temperature detection voltage in response to an ambient temperature and the output signal of the OP amp. The comparator compares the reference voltage with the temperature detection voltage to generate a temperature control signal. The band gap reference voltage generator generates the band gap reference voltage. Accordingly, the temperature detection circuit of the present invention can perform high or low temperature detection stably in supply voltage and temperature variations and thus protect the operation of the integrated circuit.
REFERENCES:
patent: 4052744 (1977-10-01), Boothman et al.
patent: 5886515 (1999-03-01), Kelly
patent: 6697205 (2004-02-01), Cyrusian et al.
Callahan Timothy P.
F. Chau & Associates LLC
Nguyen Hiep
Samsung Electronics Co,. Ltd.
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