標題: A Fully-Integrated Charge Pump for Self-Powered Implantable Retinal Prostheses
作者: Wong, Oi-Ying
Chen, Po-Hung
Wu, Chung-Yu
電子工程學系及電子研究所
生醫電子轉譯研究中心
Department of Electronics Engineering and Institute of Electronics
Biomedical Electronics Translational Research Center
關鍵字: charge pump;energy harvesting;low voltage;photovoltaic cell;implantable device
公開日期: 2016
摘要: This paper presents a compact fully-integrated charge pump based voltage doubler for self-powered implantable retinal prostheses. The target input voltage is 0.55 V to meet the output voltage of on-chip photovoltaic cells, and the target output is around 1 V to provide sufficient current for neuron stimulation. Several techniques are adopted in the proposed design, including gate-boosting circuits to enhance current driving capability, a time-interleaving technique to reduce the size of the output capacitor, and a non-overlapping clock generator to suppress the shoot-through current. The proposed charge pump was implemented in 0.18 mu m CMOS process with core chip area of 700 mu m x 280 mu m. The measurement results demonstrate that the proposed charge pump is capable of providing around 1 V output from an input voltage of 0.55 V with 500 mu A loading current. The peak power efficiency is 73.4 % and the total area is 700 mu m x 280 mu m.
URI: http://hdl.handle.net/11536/134533
ISBN: 978-1-5090-1235-0
期刊: 2016 IEEE INTERNATIONAL SYMPOSIUM ON RADIO-FREQUENCY INTEGRATION TECHNOLOGY (RFIT)
Appears in Collections:Conferences Paper