Method for oscillating and start up circuit for oscillator

Details Method for oscillating and start up circuit for oscillator Method for oscillating and start up circuit for oscillator

1998-08-01

2000-01-04

Mis, David

Oscillators

With synchronizing, triggering or pulsing circuits

Triggering or pulsing

331 1A, 331 11, 331 57, 331 74, 327142, 327156, 327159, H03B 524, H03B 506, H03L 7099, H03L 7113

Patent

active

060114452

ABSTRACT:
The present invention provides a reliable method for oscillating an oscillator having an oscillator output without fail. The method includes steps of detecting whether the oscillator is regularly oscillating, and releasing the oscillator to oscillate when the oscillator is regularly oscillating, and holding the oscillator from oscillating until an enough control voltage is built-up therefor when the oscillator is not regularly oscillating. The present invention also provides a start up circuit for an oscillator having an oscillator output having a first state in a first instance and a second state in a second instance. The start up circuit includes a detecting device which includes a first input end for inputting therethrough the oscillator output, and a detecting output having a third state in a third instance and a fourth state in a fourth instance such that when the detecting output is in the third state, the oscillator is in a first work mode, and when the detecting output is in the fourth state, the oscillator is in a second work mode.

REFERENCES:
patent: 5347232 (1994-09-01), Nishimichi
patent: 5534826 (1996-07-01), Logan
Yasuo Tsuzuki, et al., "Fast Start-up crystal oscillator circuits,", Proceedings of the 49.sup.th th Annual IEEE International Frequency Control Symposium , May 1995, pp. 565-568.

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