ST STEVAL－IME003V1醫(yī)療超聲波圖像解決方案

1、st stevalime003v1醫(yī)療超聲波圖像解決方案st公司的steval-ime003v1是基于四路sthv748高壓脈沖發(fā)生器的超聲波圖像演示板,輸出波形通過銜接探針到bnc就能挺直在示波器上顯示.16種預(yù)置波形能用來在變幻的條塊下測試高壓(hv)脈沖發(fā)生器.而sthv748是±90 v 2 a高速脈沖發(fā)生器,工作頻率高達20mhz,主要用于醫(yī)療超聲圖像,脈沖發(fā)生器,ndt超聲發(fā)送和壓電驅(qū)動器.本文介紹了sthv748主要特性,典型應(yīng)用以及steval-ime003v1主要特性,框圖,材料清單和元件布局圖.the steval-ime003v1 demonstration b

2、oard is designed around the sthv748 4-channel high voltage pulser, a state-of-the-art device designed for ultrasound imaging applications.the output waveforms can be displayed directly on an oscilloscope by connecting the scope probe to the relative bncs. 16 preset waveforms are available to test th

3、e hv pulser under varying conditions.sthv748 is 5-level, ±90 v, 2 a high speed pulser with four independent channels.this monolithic, high-voltage, high-speed pulser generator features four independent channels. it is designed for medical ultrasound imaging applications, but it can also be used

4、 for driving other piezoelectric, capacitive or based transducers. the sthv748 comprises a controller logic interface circuit, level translators, gate drivers, noise blocking diodes, and high-power p-channel and n-channel mosfets as the output stage for each channel, clamping-to-ground circuitry, an

5、ti-leakage, anti-memory effect block, thermal sensor, and a t/r switch which guarantees an effective decoupling during the transmission phase. moreover, the sthv748 includes self-biasing and thermal shutdown blocks. each channel can support up to five active output levels with two half bridges. the

6、output stage of each channel is able to provide ±2 a peak output current. in order to reduce power dissipation during continuous wave mode, a dedicated half bridge is available and the peak current is limited to 0.6 a.sthv748主要特性:0 to ±90 v output voltageup to 20 mhz operating frequencyemb

7、edded low-power, floating high-voltage drivers (external voltage rails can be also used)mode operations:3/5-levels output waveform±2 a source and sink currentdown 20 ps jitteranti-cross conduction functionlow 2nd harmonic distortionfully integrated clamping-to-ground function8 synchronous activ

8、e clampanti-leakage on output nodededicated half bridge for continuous wave (cw) operations 0.1 w power consumption±0.6 a source and sink current 10 ps jitterfully integrated t/r switch13.5 on resistancehv mos topology to minimize current consumptionup to 300 mhz bwreceiver multiplexing function2.4 v to 3.6 v logic interfaceauxiliary integrated circuitsnoise blocking diodesfully self-biasing architectureanti-memory effect for all internal hv nodesthermal protectionstandby functionlatch-up free due to hv soi technologyvery few external passive components