Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Frequency or repetition rate conversion or control
Patent
1996-10-18
1998-09-08
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Frequency or repetition rate conversion or control
327118, 327163, 331177R, 331178, 368201, H03K 2100
Patent
active
058050000
ABSTRACT:
A regulating circuit for a quartz crystal oscillator-based timepiece is capable of compensating for large deviations in oscillation frequency of the quartz crystal oscillator. A frequency divider sequentially divides the reference clock by one-half. A regulation data setting circuit sets logical regulation data used to compensate for deviations in the oscillation frequency of the oscillator from a desired value. A regulation circuit adjusts the frequency dividing ratio of the frequency dividing circuit based on the logical regulation data in accordance with a predetermined cycle and controls in such a manner that the frequency of a divided output signal of the frequency divider has a predetermined frequency. When the frequency of the divided output signal cannot coincide with the predetermined frequency using the set logical regulation data, the range of adjustment is shifted using data set in a switch during production of the timepiece.
REFERENCES:
patent: 4300224 (1981-11-01), Nakazaki et al.
patent: 4408897 (1983-10-01), Mutrux
patent: 4461582 (1984-07-01), Walther
patent: 4553850 (1985-11-01), Kanno
patent: 4779248 (1988-10-01), Odagiri et al.
patent: 5195063 (1993-03-01), Moriya
Callahan Timothy P.
Seiko Instruments Inc.
Wells Kenneth B.
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