Stand-Alone Broad Frequency Range Charge-Balancing System for Neural Stimulators

Conference paper (2023)

Authors

Jana M. Späth Technical University of Berlin, Fraunhofer Izm

K. Kolovou Kouri Bio-Electronics - , Fraunhofer Izm

L.F.M. Holzapfel Fraunhofer Izm, Bio-Electronics -

Roland Thewes Technical University of Berlin

Vasiliki Giagka Bio-Electronics - , Fraunhofer Izm

Research Group

Bio-Electronics () (TU Delft)

DOI: https://doi.org/10.1109/BioCAS58349.2023.10388758

Neural stimulation Active charge balancing Offset compensation Kilohertz frequency alternating current (KHFAC)

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Published Date

2023

Language

English

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Faculty

Electrical Engineering, Mathematics and Computer Science

Department

Microelectronics

Research Group

Bio-Electronics

Abstract

Safety is a critical consideration when designing an electrical neural stimulator, given the direct contact with neural tissue. This paper presents the design of a charge balancing system suitable for frequencies up to the kilohertz domain, to be used as an add-on system for stimulators over a wide range of frequencies, also covering nerve conduction blocking. It operates independently of the stimulator timing by continuously sensing the offset voltage, and applying a corrective current to the electrode, using the offset compensation technique. To ensure its stand-alone capability, the system is battery-powered, and includes a safety and start-up circuit. Electrical measurements verified the functionality of the circuit, demonstrating a residual offset of only 0.7 mV for 1 V biphasic pulses at 50 kHz. When tested for 20 kHz biphasic pulse at a 5 V amplitude, the offset was measured at -11.6 mV, which is still within the (commonly used) ±50 mV safety window.

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- Embargo expired in 18-07-2024