Almarri, Noora;
Jiang, Dai;
Langlois, Peter J;
Rahal, Mohamad;
Demosthenous, Andreas;
(2023)
High Efficiency Power Management Unit for Implantable Optical-Electrical Stimulators.
IEEE Open Journal of Circuits and Systems
, 4
pp. 3-14.
10.1109/ojcas.2023.3240644.
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Abstract
Battery-less active implantable devices are of interest because they offer longer life span and eliminate costly battery replacement surgical interventions. This is possible as a result of advances in inductive power transfer and development of power management circuits to maximize the overall power transfer and provide various voltage levels for multi-functional implantable devices. Rehabilitation therapy using optical stimulation of genetically modified peripheral neurons requires high current loads. Standard rectification topologies are inefficient and have associated voltage drops unsuited for miniaturized implants. This paper presents an integrated power management unit (PMU) for an optical-electrical stimulator to be used in the treatment of motor neurone disease. It includes a power-efficient regulating rectifier with a novel body biased high-speed comparator providing 3.3 V for the operation of the stimulator, a 3-stage latch-up charge pump with 12 V output for the input stage of the optical-electrical stimulator, and 1.8 V for digital control logic. The chip was fabricated in a 0.18 μm CMOS process. Measured results show that for a regulated output of 3.3 V delivering 30.3 mW power, the peak power conversion efficiency is 84.2% at 6.78 MHz inductive link tunable frequency reducing to 70.3% at 13.56 MHz. The charge pump with on chip capacitors has 90.9% measured voltage conversion efficiency.
| Type: | Article |
|---|---|
| Title: | High Efficiency Power Management Unit for Implantable Optical-Electrical Stimulators |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1109/ojcas.2023.3240644 |
| Publisher version: | https://doi.org/10.1109/OJCAS.2023.3240644 |
| Language: | English |
| Additional information: | This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third-party material in this article are included in the Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ |
| Keywords: | Rectifiers , Stimulated emission , Optical device fabrication , Nonlinear optics , Phasor measurement units , Optical pumping , Power system management |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10167990 |
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