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Contribution to Book
A 50µm Pitch, 1120-Channel, 20kHz Frame Rate Microelectrode Array for Slice Recording
2013 IEEE Biomedical Circuits and Systems Conference (BioCAS)
(2013)
Abstract
We present a 1,120 channel active microelectrode array with 50µm pitch recording sites for direct recording of neural slices. Every sensor site has a frontend low noise amplifier and photopixel for correlating optical stimulus with electrical activity. The frontend is AC-coupled and achieves area-efficiency by integrating the large input capacitor and recording electrode directly over the circuitry in conjunction with a single T-capacitor feedback network. Degraded PSRR (63dB) and CMRR (21dB) from the single feedback network are overcome by utilizing a virtual shared reference, improving rejection to 84dB and 66dB, respectively. Despite a small area, the frontend amplifier has an input-referred noise of 4.3µVrms with tunable high- and low-pass corners with very little variation from site-to-site. Experiments from a transgenic mouse olfactory bulb slice are shown. The array was implemented in a standard 180nm CMOS process.
Disciplines
Publication Date
2013
Publisher
IEEE
ISBN
978-1-4799-1471-5
DOI
10.1109/BioCAS.2013.6679651
Citation Information
Ben Johnson, Shane T. Peace, Thomas A. Cleland and Alyosha Molnar. "A 50µm Pitch, 1120-Channel, 20kHz Frame Rate Microelectrode Array for Slice Recording" Piscataway, NJ2013 IEEE Biomedical Circuits and Systems Conference (BioCAS) (2013) p. 109 - 112 Available at: http://works.bepress.com/benjamin-johnson01/6/