科研之友
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摘要
To enable chronic and stable neural recording, we have been developing an implantable multichannel neural recording system with impedance analysis functions. One of the important things for high-quality neural signal recording is to maintain well interfaces between recording electrodes and tissues. We have proposed an impedance analysis circuit with a very small circuit area, which is implemented in a multichannel neural recording and stimulating system. In this paper, we focused on the design of an impedance analysis circuit configuration and the evaluation of a minimal voltage measurement unit. The proposed circuit has a very small circuit area of 0.23mm(2) designed with 0.18 mu m CMOS technology and can measure interface impedances between recording electrodes and tissues in ultrawide ranges from 100 Omega to 10 M Omega. In addition, we also successfully acquired interface impedances using the proposed circuit in agarose gel experiments.
- 出版日期2016-4
