Method of and apparatus for driving an ultrasonic transducer inc

Details Method of and apparatus for driving an ultrasonic transducer inc Method of and apparatus for driving an ultrasonic transducer inc

1979-08-09

1981-06-23

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Search sweep of oscillator

310316, 318116, 331116R, H01L 4108, H03L 712, H03B 532

Patent

active

042753635

ABSTRACT:
A method and a circuit for stably driving an ultrasonic transducer by sweeping, as a first step of starting the oscillation, the oscillating frequency over a range wider than a PLL followable range, finding a resonant point to lock the oscillating frequency thereto, and effecting, as a second step, the PLL following operation starting from the above resonant point.

REFERENCES:
patent: 2752512 (1956-06-01), Sarratt
patent: 2917691 (1959-12-01), DePrisco 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
patent: 4175242 (1979-11-01), Kleinschmidt

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