Oscillators – Automatic frequency stabilization using a phase or frequency... – Search sweep of oscillator
Patent
1989-06-14
1990-10-23
Mis, David
Oscillators
Automatic frequency stabilization using a phase or frequency...
Search sweep of oscillator
331 65, 331158, 310316, H03L 710, H03L 712, G05D 1902
Patent
active
049655329
ABSTRACT:
Circuit for use in a surgical operation including a phase lock loop having a voltage controlled oscillator, and a phase comparator for comparing a phase of a voltage of a driving signal and a phase of a signal representing the vibration phase of the ultrasonic transducer to derive a phase difference therebetween which is applied to the voltage controlled oscillator as a frequency control voltage such that the driving signal is phase-locked with a resonance frequency of the ultrasonic transducer, the improvement being characterized in that during a start period, a reference signal having a frequency which is increased monotonously is applied to the phase comparator such that the frequency of the driving signal is increased until the driving signal is phase-locked with the vibration phase of the ultrasonic transducer vibrating at the resonance frequency. After the phase-lock condition has been attained, the signal representing the vibration phase of the ultrasonic transducer is applied to the phase comparator instead of the reference signal.
REFERENCES:
patent: 4275363 (1981-06-01), Mishiro et al.
patent: 4587958 (1986-05-01), Noguchi et al.
patent: 4724401 (1988-02-01), Hogge, Jr. et al.
patent: 4754186 (1988-06-01), Choperena et al.
patent: 4879528 (1989-11-01), Gotanda
Mis David
Olympus Optical Co,. Ltd.
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