A fully-integrated charge pump for self-powered implantable retinal prostheses

Oi Ying Wong, Po-Hung Chen, Chung-Yu Wu

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

2 Scopus citations

Abstract

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 μm CMOS process with core chip area of 700 μm × 280 μm. 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 μα loading current. The peak power efficiency is 73.4 % and the total area is 700 μm × 280 μm.

Original languageEnglish
Title of host publicationRFIT 2016 - 2016 IEEE International Symposium on Radio-Frequency Integration Technology
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781509012350
DOIs
StatePublished - 27 Sep 2016
Event2016 IEEE International Symposium on Radio-Frequency Integration Technology, RFIT 2016 - Taipei, Taiwan
Duration: 24 Aug 201626 Aug 2016

Publication series

NameRFIT 2016 - 2016 IEEE International Symposium on Radio-Frequency Integration Technology

Conference

Conference2016 IEEE International Symposium on Radio-Frequency Integration Technology, RFIT 2016
CountryTaiwan
CityTaipei
Period24/08/1626/08/16

Keywords

  • charge pump
  • energy harvesting
  • implantable device
  • low voltage
  • photovoltaic cell

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