Method for digital frequency trimming an oscillator in an electr

Details Method for digital frequency trimming an oscillator in an electr Method for digital frequency trimming an oscillator in an electr

1979-12-21

1981-08-04

Miska, Vit W.

Horology: time measuring systems or devices

Regulating means

For adjusting the frequency or beat

73 6, G04B 1712, G04B 1700

Patent

active

042825954

ABSTRACT:
A method and apparatus for adjusting the frequency of piezoelectric crystal oscillator. The effective frequency of the oscillator is adjusted (trimmed) by periodically inhibiting pulses to the divider stage.
The pulse inhibit circuit includes a nonvolatile programmable read-only-memory (ROM) to store binary complement information corresponding to the number of oscillator pulses to be suppressed.
A counter is periodically preset with the binary complement information and the count advances in response to oscillator pulses. The difference count between the complement number and the counter's maximum count controls the number of pulses periodically suppressed.
During manufacture/assembly of the timepiece, the ROM is programmed to contain the desired complement information.

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Basic Digital Electronics Ray Ryan, Tab Books, 1975.

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