Oscillators – Automatic frequency stabilization using a phase or frequency... – Afc with logic elements
Patent
1979-08-09
1981-07-07
Moore, David K.
Oscillators
Automatic frequency stabilization using a phase or frequency...
Afc with logic elements
331116M, 331 25, 310316, H03L 700
Patent
active
042777585
ABSTRACT:
The present invention deals with an ultrasonic wave generating apparatus with voltage controlled filter, comprising a phase comparator which detects a shifted value from a predetermined phase difference between a driving voltage or a driving current of an ultrasonic transducer and a vibratory velocity signal, and a voltage-controlled band-pass filter which is controlled by the output of the phase comparator and which is provided in a feedback loop from the vibratory velocity signal to an input of a driving amplifier of the ultrasonic transducer, wherein the oscillating frequency is changed while following the resonant frequency of the ultrasonic transducer, so that stable operation is materialized without developing abnormal oscillation in subresonant frequencies and permitting very small following error.
REFERENCES:
patent: 2752512 (1956-06-01), Sarratt
patent: 2917691 (1959-12-01), Prisco et al.
patent: 3889166 (1975-06-01), Scurlock
patent: 3931533 (1976-01-01), Raso et al.
patent: 3967143 (1976-06-01), Watanabe et al.
patent: 3975650 (1976-08-01), Payne
Moore David K.
Taga Electric Company, Limited
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