Pub Date : 1900-01-01DOI: 10.1109/BIOCAS.2010.5709597
Xiao Liu, A. Demosthenous, A. Vanhoestenberghe, N. Donaldson
This paper presents the outline design of a CMOS stimulator ASIC to be embedded in implantable electrodes. The stimulator is designed to drive four tripolar output channels on an electrode “book” with independent settings on the ratio of anodic currents for each individual channel. Power and data are sent to the ASIC via five wires from a central hub unit. This configuration significantly reduces the cable count for multichannel stimulation applications. The stimulator supports a quiescent mode in which only sub-μA current is drawn from the supply. The ASIC was designed in a 0.6-μm HV CMOS process and post-layout simulation results are presented.
{"title":"Design of a stimulator ASIC for active electrode books","authors":"Xiao Liu, A. Demosthenous, A. Vanhoestenberghe, N. Donaldson","doi":"10.1109/BIOCAS.2010.5709597","DOIUrl":"https://doi.org/10.1109/BIOCAS.2010.5709597","url":null,"abstract":"This paper presents the outline design of a CMOS stimulator ASIC to be embedded in implantable electrodes. The stimulator is designed to drive four tripolar output channels on an electrode “book” with independent settings on the ratio of anodic currents for each individual channel. Power and data are sent to the ASIC via five wires from a central hub unit. This configuration significantly reduces the cable count for multichannel stimulation applications. The stimulator supports a quiescent mode in which only sub-μA current is drawn from the supply. The ASIC was designed in a 0.6-μm HV CMOS process and post-layout simulation results are presented.","PeriodicalId":440499,"journal":{"name":"2010 Biomedical Circuits and Systems Conference (BioCAS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130790127","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.1109/BIOCAS.2010.5709607
D. Jiang, A. Demosthenous, D. Cirmirakis, T. Perkins, N. Donaldson
This paper presents the design of a multichannel stimulator ASIC for an implantable neural prosthesis to restore 3-D vestibular sensation. The stimulator can provide the three semicircular canals with biphasic current pulses at rates between 1 and 500 pps with current amplitudes up to 1 mA. The ASIC was implemented in 0.6 μm HV CMOS technology and post-layout simulations are presented.
{"title":"Design of a stimulator ASIC for an implantable vestibular neural prosthesis","authors":"D. Jiang, A. Demosthenous, D. Cirmirakis, T. Perkins, N. Donaldson","doi":"10.1109/BIOCAS.2010.5709607","DOIUrl":"https://doi.org/10.1109/BIOCAS.2010.5709607","url":null,"abstract":"This paper presents the design of a multichannel stimulator ASIC for an implantable neural prosthesis to restore 3-D vestibular sensation. The stimulator can provide the three semicircular canals with biphasic current pulses at rates between 1 and 500 pps with current amplitudes up to 1 mA. The ASIC was implemented in 0.6 μm HV CMOS technology and post-layout simulations are presented.","PeriodicalId":440499,"journal":{"name":"2010 Biomedical Circuits and Systems Conference (BioCAS)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117054918","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.1109/BIOCAS.2010.5709596
V. Valente, A. Demosthenous, R. Bayford
Active control over the electric field distribution during deep brain stimulation (DBS) can provide better focus of the stimulation field on target regions, beneficial to improve neural selectivity and reduce side effects arising from simulation of non-target regions. A current-steering tripolar electrode configuration can be adopted to achieve better selectivity in DBS. The tripole consists of a central cathode and two lateral anodes. The currents through the anodes are set by two complementary current sources. By varying the ratio between the amplitude of the anodic currents, the current can be steered toward one anode, while keeping the cathodic current constant. In this paper we present the design of a current-steering tripolar current source in 0.35μm CMOS technology. The current source is capable of delivering cathodic currents up to 1.5mA and generate exponential and quasi-trapezoidal pulses needed for anodal blocking. The average mismatch between sourcing and sinking currents is in the order of 0.4% and the output compliance ranges between 6.1V and 11.15V for a 12V supply, when the maximum and minimum anodic currents are supplied, respectively.
{"title":"Design of a current-steering implantable stimulator with electric field shifting for deep brain stimulation","authors":"V. Valente, A. Demosthenous, R. Bayford","doi":"10.1109/BIOCAS.2010.5709596","DOIUrl":"https://doi.org/10.1109/BIOCAS.2010.5709596","url":null,"abstract":"Active control over the electric field distribution during deep brain stimulation (DBS) can provide better focus of the stimulation field on target regions, beneficial to improve neural selectivity and reduce side effects arising from simulation of non-target regions. A current-steering tripolar electrode configuration can be adopted to achieve better selectivity in DBS. The tripole consists of a central cathode and two lateral anodes. The currents through the anodes are set by two complementary current sources. By varying the ratio between the amplitude of the anodic currents, the current can be steered toward one anode, while keeping the cathodic current constant. In this paper we present the design of a current-steering tripolar current source in 0.35μm CMOS technology. The current source is capable of delivering cathodic currents up to 1.5mA and generate exponential and quasi-trapezoidal pulses needed for anodal blocking. The average mismatch between sourcing and sinking currents is in the order of 0.4% and the output compliance ranges between 6.1V and 11.15V for a 12V supply, when the maximum and minimum anodic currents are supplied, respectively.","PeriodicalId":440499,"journal":{"name":"2010 Biomedical Circuits and Systems Conference (BioCAS)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126389150","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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