A Fully Integrated RF-Powered Energy-Replenishing Current-Controlled Stimulator

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This paper presents a fully-integrated current-controlled stimulator that is powered directly from on-chip coil antenna and achieves adiabatic energy-replenishing operation without any bulky external components. Adiabatic supply voltages, which can reach a differential range of up to 7.2V, are directly generated from an on-chip 190-MHz resonant LC tank via a selfcascading/folding rectifier network, bypassing the losses that would otherwise be introduced by the 0.8 V system supply-generating rectifier and regulator. The stimulator occupies 0.22 mm(2) in a 180 nm silicon-on-insulator process and produces differential currents up to 145 mu A. Using a charge replenishing scheme, the stimulator redirects the charges accumulated across the electrodes to the system power supplies for 63.1% of stimulation energy recycling. To benchmark the efficiency of stimulation, a figure of merit termed the stimulator efficiency factor (SEF) is introduced. The adiabatic power rails and energy replenishment scheme enabled our stimulator to achieve an SEF of 6.0.
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Issue Date
2019-02
Language
English
Article Type
Article
Citation

IEEE TRANSACTIONS ON BIOMEDICAL CIRCUITS AND SYSTEMS, v.13, no.1, pp.191 - 202

ISSN
1932-4545
DOI
10.1109/TBCAS.2018.2881800
URI
http://hdl.handle.net/10203/251898
Appears in Collection
BiS-Journal Papers(저널논문)
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