Method and apparatus for switching on an ultrasound...

Details Method and apparatus for switching on an ultrasound... Method and apparatus for switching on an ultrasound...

2006-06-29

2008-10-21

Mis, David (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Search sweep of oscillator

C331S17700V, C310S317000

Reexamination Certificate

active

07439815

ABSTRACT:
In a method and a circuit arrangement for operating an ultrasound oscillation system, wherein an excitation voltage is applied to an ultrasound oscillation system comprising an ultrasound oscillator and components for forming an oscillation circuit for generating an excitation current and wherein the frequency of the excitation voltage is adjustable for operating the ultrasound oscillation system at a predetermined operating point, upon switching on the ultrasound oscillation system, the frequency, beginning with a startup frequency, is changed until the operating point is reached, and, upon switching off the ultrasound oscillation system, the frequency of the excitation circuit is recorded in a storage device and the recorded value is used for determining the startup frequency when the ultrasound oscillation system is again switched on.

REFERENCES:
patent: 5013982 (1991-05-01), Sasaki
patent: 44 00 210 (1995-08-01), None

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