A closed-loop charge balancing FPAA circuit with sub-nano-amp DC error for electrical stimulation

Author

Kolbl, F. ; Guillaume, R. ; Hasler, J. ; Joucla, S. ; Yvert, B. ; Renaud, S. ; Lewis, N.

Author_Institution

IMS, Univ. of Bordeaux, Talence, France

fYear

2014

fDate

22-24 Oct. 2014

Firstpage

616

Lastpage

619

Abstract

The design of neuro-stimulator has to respect tissue safety conditions. Especially, electrical charge-balancing of stimuli is of major concern, and electrode drivers have to ensure correct stimulation whatever the load. This paper describes a new front-end stimulation topology based on a charge metering closed-loop. The circuit was developed on a Field-Programmable-Analog-Array. Characterisation shows an equivalent leakage current under 1nA and the stimulator was successfully used on a rat´s spinal-cord.

Keywords

bioelectric phenomena; biological tissues; biomedical electrodes; closed loop systems; field programmable analogue arrays; neurophysiology; patient rehabilitation; patient treatment; Field-Programmable-Analog-Array; charge metering closed-loop; closed-loop charge balancing FPAA circuit; correct stimulation; current 1 nA; electrical charge-balancing; electrical stimulation; electrode drivers; equivalent leakage current; front-end stimulation topology; neurostimulator design; spinal-cord; stimuli; sub-nano-amp DC error; tissue safety conditions; Current measurement; Field programmable analog arrays; Safety; Spinal cord; Threshold voltage; Tuning;

fLanguage

English

Publisher

ieee

Conference_Titel

Biomedical Circuits and Systems Conference (BioCAS), 2014 IEEE

Conference_Location

Lausanne

Type

conf

DOI

10.1109/BioCAS.2014.6981801

Filename

6981801