The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The effect of optical stimulation of neural tissue is considered in capacitively coupled CMOS microelectrode arrays used for in vitro extracellular recording from neural tissue. Using a 25-nm high-k TiO2 sensor dielectric with 20% ZrO2, light-induced currents through the dielectric are found at short wavelengths within the visible and relevant spectrum for the above-mentioned purpose. Purely capacitive...
A CMOS MEA with 4k recording and 1k stimulation sites is used for time-continuous recording of neural signals during stimulation. All sites consist of thin metal electrodes on the chip surface covered by a thin high-k dielectric. Recording and stimulation channels are electrically separated but physically superimposed so that recording at the site of stimulation is possible as well as at any other...
An overview and introduction is given concerning CMOS chips used for neural tissue interfacing. Some basics in the biological domain are discussed as well as extracellular neural tissue interfacing approaches, design philosophies applied to high spatiotemporal resolution devices, in-vitro and in-vivo applications, and related challenges in the engineering domain.
Local field potentials (LFPs) contain relevant information about neuronal population activity [1]. They are commonly measured in the brain to investigate information processing by neural circuits and for neuroprosthetics applications. We present a novel method allowing for in vivo ‘electrical imaging’ of LFPs. An oxide-insulated neural probe was implanted in the brain of a rat, establishing a capacitive...
CMOS-based neural tissue in-vivo recording chips with a purely capacitive interface are presented with 256 sites resp. 256 recording channels. A 3D post-CMOS ALD-based process allows to provide a highly efficient sensor dielectric and to realize a protective insulation layer for the non-active part of the fabricated devices. A simple interconnect-efficient sensor array topology is used. Electrical...
A high spatiotemporal resolution, wireline operation-based, in-vivo neural recording system is presented. The proposed system allows selecting 64 channels from 512 recording sites. The neural signals from the 64 selected sites are amplified, filtered, and finally multiplexed in the time domain. The output signals of each multiplexer are buffered, converted to the current domain, and then transferred...
Titanium dioxide, known as a high-k biocompatible dielectric transducer material, is processed by means of ALD and applied to a 3D structure with dimensions typical for multi-site multi-channel in-vivo neural interfaces. High uniformity, high areal capacitance, and in particular low leakage current densities are achieved within a sufficiently wide operation voltage window. The results demonstrate...
A CMOS-based microelectrode array (MEA) with 4225 recording sites and 1024 stimulation sites and a related data acquisition system are presented. The chip provides high spatiotemporal resolution on an active area of 1 mm × 1 mm or 2 mm × 2 mm, respectively, and allows in-vitro neural tissue interfacing experiments with full imaging capability. The entire chip surface is covered by a thin high-k dielectric...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.