A low-cost bipolar pulse generator for high-frequency ultrasound applications

Ultrasound Driving Application of a Universal Waveform Generator Derived from Displaying Driving System

“…Also, the frequency of the waveform in [2]- [5] is higher. This is because they aim at high frequency ultrasound (HFUS) applications, which is an emerging application of ultrasound over 20 MHz.…”

“…Figure 7 provides a comparison of waveforms generated by the universal waveform generator, and circuit specifically designed for ultrasound driving in [2]- [5]. Through the comparison, the amplitude of waveform, both unipolar and bipolar, generated by the universal waveform generator is proved to satisfy the requirement for ultrasound transducer driving.…”

“…For voltage 'jumping' part in every module, a common MOSFET driving structure is used, like those in [2]- [5]. All pulse generating modules use the same type of N-MOSFET.…”

“…In common applications like ultrasound detection, surgical ultrasound and ultrasound chemistry, the requirement for high amplitude is due to the fact that attenuation of ultrasound will cause loss of information contained in the reflection wave in a pulse-echo detection system or reduce the power of ultrasound induced effect. In practical circuits, the high amplitude ultrasound pulses can be implemented either in unipolar form or in bipolar form [2]- [5]. Unipolar form has the advantage of shorter wave length, i.e.…”

“…At present days, the research works about the ultrasound pulse generators focus on three aspects, they are the pulse generator for higher frequency [3]- [5], pulse generator for lower cost [2], multifunction and reconfigurable pulse generators [5], respectively. As we know, many other electrical devices need high voltage pulses for controllable driving, such as displaying device.…”