Low transient switching system

Details Low transient switching system Low transient switching system

1991-05-24

1992-07-21

Pihulic, Daniel T.

Communications, electrical: acoustic wave systems and devices

Echo systems

Distance or direction finding

367 7, G03B 4206

Patent

active

051329395

ABSTRACT:
This invention relates to low transient switching apparatus, and more particularly to switching arrays of low transient switching circuits which are adapted for use to substantially continuously focus transducer channel outputs in an ultrasonic scanning system. A separate switching array is provided for each channel. Each array has a switching circuit with an output for each focusing delay line tap to which a signal on the channel may be applied. Each switching circuit provides a substantially constant D.C. current output regardless of the state of the circuit. Array outputs for each delay line tap are summed, and the summed outputs are applied as the input to the tap. The DC current inputs to all taps are maintained substantially equal, preferably at zero DC current.

REFERENCES:
patent: 4218768 (1980-08-01), Hassler

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