Design of a multichannel CMOS biosensor IC for extracellular neural recording

Document Type

Conference Proceeding

Date of Original Version



This paper describes in detail the design of a 32-channel mixed-signal full-customized CMOS integrated biopotential sensor chip for extracellular recording of neural signal Each analog channel has three major sub-circuit macros, which includes contact sensors, unity gain buffer and variable gain amplifier. Each channel has three working modes: test mode, run mode and zero mode. Analog channels are grouped and addressed by eight 4-1 decoders which obtain control signals from a 16-bit serial-in parallel-out shift register. This device was fabricated by MOSIS using AMI's 1.5 μm, double poly, double level metal CMOS technology.

Publication Title

Proceedings of the 2005 International Conference on Mathematics and Engineering Techniques in Medicine and Biological Sciences, METMBS'05

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