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Dual Output Regulating Rectifier for an Implantable Neural Interface

Almarri, Noora; Jiang, Dai; Demosthenous, Andreas; (2021) Dual Output Regulating Rectifier for an Implantable Neural Interface. In: 2021 28th IEEE International Conference on Electronics, Circuits, and Systems (ICECS). IEEE: Dubai, United Arab Emirates. Green open access

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Abstract

This paper presents the design of a power management circuit consisting of a dual output regulating rectifier configuration featuring pulse width modulation (PWM) and pulse frequency modulation (PFM) to control the regulated output of 1.8 V, and 3.3 V from a single input ac voltage. The PFM control feedback consists of feedback-driven regulation to adjust the driving frequency of the power transistors through the buffers in the active rectifier. The PWM mode control provides a feedback loop to accurately adjust the conduction duration. The design also includes an adiabatic charge pump (CP) to power stimulators in an implantable neural interface. The adiabatic CP consists of latch up and power saving topologies to enhance its energy efficiency. Simulation results show that the dual regulating rectifier has 94.3% voltage conversion efficiency with an ac input magnitude of 3.5 Vp. The power transfer efficiency of the regulated 3.3 V output voltage is 82.3%. The dual output regulating rectifier topology is suitable for multi-functional implantable devices. The adiabatic CP has an overall efficiency of 92.9% with an overall on-chip capacitance of 60 pF. The circuit was designed in a 180-nm CMOS technology.

Type: Proceedings paper
Title: Dual Output Regulating Rectifier for an Implantable Neural Interface
Event: 2021 28th IEEE International Conference on Electronics, Circuits, and Systems (ICECS)
Dates: 28 Nov 2021 - 1 Dec 2021
ISBN-13: 9781728182810
Open access status: An open access version is available from UCL Discovery
DOI: 10.1109/icecs53924.2021.9665613
Publisher version: https://doi.org/10.1109/ICECS53924.2021.9665613
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Adiabatic charge pump, biomedical implant, inductive wireless power transfer, pulse frequency modulation, pulse width modulation, regulating rectifier
UCL classification: 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
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL
URI: https://discovery.ucl.ac.uk/id/eprint/10144575
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