Ultrasound front-end circuit combining the transmitter and autom

Details Ultrasound front-end circuit combining the transmitter and autom Ultrasound front-end circuit combining the transmitter and autom

1998-07-15

2000-07-04

Lateef, Marvin M.

Surgery

Diagnostic testing

Detecting nuclear, electromagnetic, or ultrasonic radiation

A61B 800

Patent

active

060831642

ABSTRACT:
An ultrasound front end circuit (1000) according to the present invention includes a single transformer core which performs all of the pulse and transmit/receive switching functions. A transmit pulser (1102) is formed by a pair of transistor switches in combination with a transformer having first windings (N1, N2) driven by a DC source. A secondary winding (N3) provides a voltage step up for transmitted wave forms and a pair of anti-parallel shunt diodes (1014) on the receiver terminal direct the transmitted 0 waveform to the ultrasound transducer (1024). A floating third winding (N4) shunted by a current biased diode bridge (1002) provides an effective open circuit across the secondary winding while transmitting high amplitude signals. The third winding (N4) and diode bridge (1002) act to short circuit the secondary winding (N3) while receiving small amplitude signals, thus providing a direct connection between the transducer (1024) and receiver (1020).

REFERENCES:
patent: 4277978 (1981-07-01), Puckette
patent: 4674516 (1987-06-01), Hirota et al.
patent: 4975885 (1990-12-01), Hassler et al.
patent: 5603324 (1997-02-01), Oppelt et al.
patent: 5609154 (1997-03-01), Oppelt et al.

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