Delay circuit of ultrasonic diagnostic apparatus using delay lin

Details Delay circuit of ultrasonic diagnostic apparatus using delay lin Delay circuit of ultrasonic diagnostic apparatus using delay lin

1991-07-08

1992-09-08

LaRoche, Eugene R.

Wave transmission lines and networks

Coupling networks

Delay lines including long line elements

307320, 73626, H01P 300

Patent

active

051461927

ABSTRACT:
A delay circuit of ultrasonic diagnostic apparatus comprising a delay line consisting of a plurality of unit portions connected in cascade, in each of which an anode of a first variable capacitance diode and a cathode of a second variable capacitance diode are connected with a connecting point of two inductors connected in series, or a delay line obtained by replacing capacitances in a second order all pass type delay line by variable capacitance diodes, or a delay line, in which variable capacitance diodes and inductors form a balanced circuit; and control circuit for applying a reverse bias voltage to each of the variable capacitance diodes; and an amplifier or a variable resistance circuit using FETs serving as a matching circuit for the delay line, capable of varying continuously an input impedance by using a control voltage from the exterior.

REFERENCES:
patent: 3391347 (1968-07-01), Bosse et al.
patent: 4430630 (1984-02-01), Sakamoto
patent: 4481823 (1984-11-01), Alais
patent: 4701714 (1987-10-01), Agoston
"NHK Monthly Report", Sho 43,5, pp. 22-27.
"IC Operational Amplifier and Application", p. 182.

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