FUNCTION GENERATING CIRCUIT AND TEMPERATURE-COMPENSATED CRYSTAL OSCILLATOR

Japanese Patent JP3730984

B2

PROBLEM TO BE SOLVED: To provide a function generating circuit operable at low voltage for a temperature-compensated crystal oscillator.
SOLUTION: First, second and third current conversion circuits 510, 520, 530 are cascade-connected, and current It2 proportional to the difference between an ambient temperature Ta and a reference temperature Tr is inputted to the first current conversion circuit 510; the first electric current conversion circuit 510 supplies a current which is proportional to the square of Ta-Tr to the second electric current conversion circuit 520; the second current conversion circuit 520 supplies the current proportional to the fourth power of Ta-Tr to the third electric current conversion circuit 530; and the third current conversion circuit 530 outputs the current It5 which is proportional to the fifth power of Ta-Tr. None of the first, second and third current conversion circuits has a configuration which does not need a power source voltage that is high for a series circuit which can drive three or more diodes.

JPS58223089	ELECTRONIC TIME PIECE WITH ALARM
JPS52102067	ELECTRONIC WATCH
JPS55126887	TEMPERATURE COMPENSATING CRYSTAL WATCH

Keigo Shingu
Eiichi Uenishi
Hisato Takeuchi

JP2003408424A

January 05, 2006

December 08, 2003

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Matsushita Electric Industrial Co., Ltd

G04G3/04; G06G7/20; H03B5/30; H03L1/02; (IPC1-7): G06G7/20; G04G3/00; H03B5/30

JP9153104A
JP9064641A
JP11004119A

Hiroshi Maeda
Hiroshi Koyama
Hiroshi Takeuchi
Yuji Takeuchi
Katsumi Imae
Tomoo Harada

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