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| 型號： | TX810IRHHT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PQCC36 |
| 封裝： | 6 X 6 MM, 0.50 MM PITCH, GREEN, PLASTIC, VQFN-36 |
| 文件頁數(shù)： | 19/19頁 |
| 文件大小： | 2713K |
| 代理商： | TX810IRHHT |
www.ti.com
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.
Copyright 2009–2010, Texas Instruments Incorporated
9
Product Folder Link(s) :TX810
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