Crystal oscillation-type electronic timepiece

Horology: time measuring systems or devices – Chronological – With pulse transforming means

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368219, 331116FE, G04C 1900, G04C 300, G04C 500, H03B 530

Patent

active

042964903

ABSTRACT:
A crystal oscillation-type electronic timepiece having an oscillator with a crystal oscillator as a time base, means for dividing the frequency of the oscillator, display driving means and time display means. The oscillator has a complementary metal oxide semiconductor logic circuit including an inverter with a gated N-channel transistor and a gated P-channel transistor. The inverter is designed such that a ratio of the width and length in a channel of the gated N-channel transistor is made less than one and that a ratio of the width and length in a channel of the gated P-channel transistor is made less than two. The capacity of an input capacitor connected to an input of the crystal oscillating element is larger than that of an output capacitor connected to an input of the crystal oscillating element. The consumed power at the oscillating part is thereby decreased.

REFERENCES:
patent: 3956880 (1976-05-01), O'Connor
patent: 3965442 (1976-06-01), Eaton
IEEE Journal of Solid State Circuits, vol. SC-7, No. 2, Apr. 1972, pp. 100-104, Silicon-Gate CMOS Frequency Divider for the Electronic Wrist Watch.

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