Wireless Ultrasound Stimulation Microsystem

• Main Authors: Jyun-Ru Wang, 王駿儒
• Other Authors: 劉深淵
• Format: Others
• Language: en_US
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/19302981958487909618

碩士 === 國立臺灣大學 === 電子工程學研究所 === 99 === In this thesis, ultrasound transmission technique is adopted and uses this method in the neural stimulator. As opposed to traditional inductive magnetically method, the ultrasound transmission technique have no electromagnetic radiation contamination and the ultrasound transmission distance is up to several centimeters and it is suitable for stimulating the deep tissue. This thesis is mainly divided into three parts. Firstly, a neural stimulator is present. The stimulator can output the stimulation current which is from 0.1mA to 0.94mA. The stimulation frequency is from 60Hz to 300Hz which is suitable bioengineering. And the power consumption is 2.1mW. Secondly, a wireless ultrasound stimulation microsystem with Amplitude Shift Keying with Carrier (ASK-Carrier) is implementation. This transmission technique receives ultrasound input signal and demodulates signal to control stimulator’s output current and frequency successfully. Meanwhile, the power management circuit is proposed to achieve low power consumption for wireless ultrasound transmission technique. This proposed wireless ultrasound stimulation microsystem is fabricated in TSMC 0.35-um 2P4M CMOS process, and occupies 2.2 mm*2 mm area. Measurement results show that the maximum data rate up to 25kbps. The power consumption of power receiver is 58.17mW. Thirdly, a wireless ultrasound stimulation microsystem with Frequency Shift Keying with Pulse Width Modulation (FSK-PWM) is implementation. This microsystem is also received the ultrasound signal and used it to control stimulator. This proposed wireless ultrasound stimulation microsystem is fabricated in TSMC 0.35-um 2P4M CMOS process, and occupies 2.2 mm*2.2 mm area. Measurement results show that the maximum data rate up to 50kbps. The power consumption of power receiver is 55mW.