TX810

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SLLS996A – SEPTEMBER 2009 – REVISED APRIL 2010

THEORY OF OPERATION

A typical ultrasound block diagram is shown in Figure 13.

Figure 13. Ultrasound System Block Diagram

A transducer is excited by high voltage pulsers. It converts the electrical energy to mechanical energy. After each

excitation, the transducer sends out ultrasonic wave to medium. Partial ultrasonic wave gets reflected by

inhomogeneous medium and received by the transducer again, i.e. echo signal. Thus, the transducer is a duplex

device on which both high voltage and low voltage signals exist. The transducer can not be connected to

amplifier stages directly; otherwise, the high voltage signal can permanently destroy amplifiers. The TX810, i.e.

T/R switches, is sitting between integrated HV pulser and low noise amplifier (LNA). The main function of TX810

is to isolate the LNA from high-voltage transmitter. TX810 limits the high voltage pulse and let echo signals

reaching amplifier. Therefore, an ideal T/R switch should completely block high voltage signals and maintain all

information from echoes.

The detail architecture of the TX810 is listed in Figure 14.

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