TY - JOUR
T1 - VLSI potentiostat array for distributed electrochemical neural recording
AU - Bandyopadhyay, Abhishek
AU - Mulliken, Grant
AU - Cauwenberghs, Gert
AU - Thakor, Nitish
PY - 2002/1/1
Y1 - 2002/1/1
N2 - A neurochemical sensor system is being developed to spatially sense and process neurotransmitters. This paper reports the design and VLSI implementation of a multi-channel potentiostat that interfaces to a nitric-oxide (NO) sensor array. Picoampere to microampere input currents are range-normalized with programmable gain, and digitized by a bank of current-mode delta-sigma analog-to-digital (A/D) converters. First-order noise shaping and 4,096-fold over-sampling provide high signal-to-noise ratio for the low-frequency NO transients. A shift register scans the buffered decimated delta-sigma outputs in bit-serial forward providing asynchronous sequential readout. An 8-channel potentiostat in 0.5 μm CMOS measures 1.5mm × 1.5mm, and consumes 0.5 mW power. The device is expected to serve as a valuable tool for neurophysiological research and implantable neural prostheses.
AB - A neurochemical sensor system is being developed to spatially sense and process neurotransmitters. This paper reports the design and VLSI implementation of a multi-channel potentiostat that interfaces to a nitric-oxide (NO) sensor array. Picoampere to microampere input currents are range-normalized with programmable gain, and digitized by a bank of current-mode delta-sigma analog-to-digital (A/D) converters. First-order noise shaping and 4,096-fold over-sampling provide high signal-to-noise ratio for the low-frequency NO transients. A shift register scans the buffered decimated delta-sigma outputs in bit-serial forward providing asynchronous sequential readout. An 8-channel potentiostat in 0.5 μm CMOS measures 1.5mm × 1.5mm, and consumes 0.5 mW power. The device is expected to serve as a valuable tool for neurophysiological research and implantable neural prostheses.
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U2 - 10.1109/ISCAS.2002.1011459
DO - 10.1109/ISCAS.2002.1011459
M3 - Article
AN - SCOPUS:0036292605
VL - 2
SP - 740
EP - 743
JO - Proceedings - IEEE International Symposium on Circuits and Systems
JF - Proceedings - IEEE International Symposium on Circuits and Systems
SN - 0271-4310
ER -