Journal of the Horological Institute of Japan

[title in Japanese]

Article type: Cover
1982 Volume 103 Pages Cover1-
Published: December 25, 1982
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.103.0_Cover1

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[title in Japanese]

Article type: Cover
1982 Volume 103 Pages Cover2-
Published: December 25, 1982
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.103.0_Cover2

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A Study on Frequency-Temperature Behavior of C-MOS crystal Oscillator.

Yoshimasa Oomura, Yasuaki Watanabe

Article type: Article
1982 Volume 103 Pages 1-12
Published: December 25, 1982
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.103.0_1

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The C-MOS crystal oscillator has been used in the fields of timepiece and other electronics devices for consuming low electric power. Although its electric behavior is obtained in room temperature, the oscillation frequency-temperature characteristic has been scarcely reported. It is shown in this paper that the C-MOS crystal oscillator is investigated experimentally in temperature range from 0℃ to 60℃ changing both externally connected condensers, i.e.the qate capacitor (C_g) and the drain one (C_d). If the adequate values of C_g and C_d are selected at the appropriate ratio of C_g to C_d, it is found experimentslly that the oscillation frequency-temperature behaviors of C-MOS crystal oscillator agree to the resonance frequency-temperature one of quartz crystal unit within 0.5 parts per million. The oscillation frequency, moreover, is unchangeable even if the supply voltage is varied from 3 volt to 4 volt in the case of the mentioned above adequate values of capacitors. The reproducibility of mentioned above characteristics is studied by using another C-MOS. It is recognized that the reproducibility is within 0.3 parts per million about frequency-temperature behavior and also within 0.4 p.p.m. about frequency-supply voltage one. The long term oscillation frequency stability of the C-MOS crystal oscillator, which is composed of the adequate values of capacitors, has been measured extend over 80 days.

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High Precision Quartz-Crystal Wrist Watch Constructed with Digitally Linearized Circuit

Kenji KAMIYA, Kazuhiro HORIUCHI, Akira KIKUYAMA

Article type: Article
1982 Volume 103 Pages 13-19
Published: December 25, 1982
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.103.0_13

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A new temperature compensated quartz watch system using thermister has been developed. The nonlinear temperature characteristic of the thermister is linearized digitally making use of a constant frequency by the master quartz oscillator. The adjustment is so easy that only one capacitor needs trimming which also absorbs deviations of system parameters.

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A Study of ECG Type Pulsimeter Watch___-

Fujio TAMURA, Jun-ichi TABATA, Shin-ich NOGAWA

Article type: Article
1982 Volume 103 Pages 20-27
Published: December 25, 1982
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.103.0_20

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We have developed a digital pulsimeter watch which picks up LEAD I ECG signal between one wrist and a forefinger of the opposite hand. As the sensitivity of ECG amplifier in the pulsimeter watch becomes higher, the undetection rate becomes smaller due to insensitivity of ECG signal and it also bescmes larger due to interference by noise. Accordingly, an optimUm sensitivity of the ECG amplifier exists where ECG undetection rate becomes minimum. For the laboratory model, ECG undetection rate was 6% when the sensitivity was at 0.25 mV. This means that the pulse rate of 94 people out of hundred can be measured satisfactorily with this model. The pulsimeter watch realized requires no high current and it works more than two years with a 3 volt lithium battery if the pulsimeter function will be used up to 10 minutes a day. Furthermore, ECG undetection rate of the actual pulsimeter is approximately 10 %.

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100nA IC FOR ANALOG QUARTZ WATCH

Y. Matsuura, C. Ueda, K. Kobayashi

Article type: Article
1982 Volume 103 Pages 28-41
Published: December 25, 1982
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.103.0_28

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We have developed a very low power consumption lOOnA IC for analog quartz watch, using the current control system. As the reference voltage for the current source, we have used a circuit in which the threshold voltage of the depletion and enhancement MOS transistors and their ratio of conductance coefficient are used. For the current source, we have used the current saturation characteristic of MOS transistor. Further, this IC features excellent electrical characteristics, stable temperature characteristics and high yield, due to the CMOS Al gate process in which thin gate oxide is used.

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[title in Japanese]

[in Japanese], [in Japanese], [in Japanese]

Article type: Article
1982 Volume 103 Pages 42-50
Published: December 25, 1982
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.103.0_42

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A low power wrist watch system with a small sized 4 MHz AT-cut qurtz resonator and a C/MOS IC consuming 2μA has been developed. Combining an oscillator circuit biased in a subthreshold region and a micro-patterned dynamic divider where P and N type FETs are biased separately, a low power consumption has been achieved.

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[title in Japanese]

[in Japanese]

Article type: Article
1982 Volume 103 Pages 51-62
Published: December 25, 1982
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.103.0_51

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