The Design of CMOS 13.56-MHz High Efficiency Voltage Doubler Rectifier and Low Dropout Regulators for Medical Devices

• Main Authors: Cheng, Ming-Sen, 鄭銘槮
• Other Authors: Wu, Chung-Yu
• Format: Others
• Language: en_US
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/03999894093315738384

碩士 === 國立交通大學 === 電子研究所 === 101 === For epilepsy detection and stimulation application, the medical device should be fully implantable. The currently battery technology still cannot stand for an enough time for medical devices operation (about 1 year), the patient need additional surgery to replace the exhausted battery annually. To solve this problem, a near-field inductive energy transmission to recharge battery or provide power supply for implantable biomedical devices is adopted. In this thesis, we have developed and fabricated a 20-mA output current CMOS active voltage doubler rectifier with the comparator can adjust the input offset voltage and the additional start control circuit operated at 13.56MHz. A comparator and additional start control circuit is designed make the CMOS active voltage doubler rectifier has correct operation and robust start-up mechanism. The hand winding near-field coil with the ferrite core is fabricated, that can successfully transmit power at resonant frequency 13.56MHz and make the proposed active voltage doubler operate successfully. For the complete design, the LDO is integrated in the single chip, realized three fully-integrated LDOs with rectifier output 2V to 1.8V output voltage for analog, digital, and reference circuits. The measured ripple voltages of rectifier, analog, digital, and reference output are 10.4mV, 5.9mV, 72.4mV, 1.5mV, respectively .The 76.5% high power efficiency is achieved.