Analog Frontend of an Implantable Biological Nerve Micro-stimulation Chip

• Main Authors: U-Fat Chio, 趙汝法
• Other Authors: Chua-Chin Wang
• Format: Others
• Language: zh-TW
• Published: 2004
• Online Access: http://ndltd.ncl.edu.tw/handle/13008309888201215119

碩士 === 國立中山大學 === 通訊工程研究所 === 92 === An analog frontend of an implantable baseband SOC (System-on-a-chip) chip design for the interface of neural micro-stimulation is present in this thesis. The mentioned neural interface including controllable stimulators, and telemetry for data and power transmission which is powered by transcutaneous magnetic coupling. An external transmitter coil is required to power and communicate with the implanted device. It can avoid the risk of causing infection and the problem of limited battery life. The first topic of this thesis proposes a single stage differential amplifier to be used as an Error Amplifier in an LDO (Low Dropout) regulator. It increases the bandwidth and decreases the chip’s area at the same time. When a bandgap bias is integrated with our design in a feedback loop, a stable voltage source is constituted to become a power supply for the entire implanted chip. The second topic reveals a C-less (no capacitor) area-saving ASK (Amplitude Shift keying) demodulator. Since there is no capacitor used in the demodulator, it can substantially reduce the layout area of the SOC without any sacrifice of the performance of the SOC