The Design of CMOS 13.56-MHz Power and Data Telemetry System with a new Low-Power Binary Phase Shift Keying Demodulator for Biomedical Implants

• Main Authors: Cheng, Cheng-Hsiang, 鄭丞翔
• Other Authors: Wu, Chung-Yu
• Format: Others
• Language: en_US
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/959xj4

碩士 === 國立交通大學 === 電子工程學系 電子研究所 === 102 === For cochlear application, the biomedical 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 needs a wireless power transfer implant medical device, meanwhile, data transmission is required for stimulator circuits. The currently technology is using dual band transmission, one for power transfer and the other for data telemetry, which causes additional area. To solve this problem, a near-field inductive power and data transmission to provide power supply and data for implantable biomedical devices is adopted. In this thesis, we have developed and fabricated a binary phase shift keying (BPSK) demodulator, using phase lock loop (PLL) to detect the change of frequency and capture the data edge to demodulate the incoming data and clock. For the complete design, the 20-mA output current CMOS active voltage doubler rectifier and LDOs are integrated in the single chip. The hand winding near-field coil with ferrite core is fabricated, that can successfully transmit power and data at resonant frequency 13.56MHz. The measured power for demodulator is 221μW at data rate is 200Kbps and the measured ripple of rectifier, analog LDO and digital LDO are 10.4mV, 5.9mV, 72.4mV. The 76.5% high power efficiency is achieved.