Design and measurements of low power multichannel chip for recording and stimulation of neural activity.
A 64-channel Neuro-Stimulation-Recording chip named NRS64 for neural activity measurements has been designed and tested. The NRS64 occupies 5×5 mm² of silicon area and consumes only 25 µW/channel. A low cut-off frequency can be tuned in the 60 mHz-100 Hz range while a high cut-off frequency can be set to 4.7 kHz or 12 kHz. A voltage gain can be set to 139 V/V or 1100 V/V. A measured input referenced noise is 3.7 µV rms in 100 Hz-12 kHz band and 7.6 µV rms in 3 Hz-12 kHz band. A digital correction is used in each channel to tune the low cut-off frequency and offset voltage. Each channel is equipped additionally with a stimulation circuit with an artifact cancellation circuit. The stimulation circuit can be set with 8-bit resolution in six different ranges from 500 nA-512 µA range.
AGH University of Science and Technology, Department of Measurements and Electronics, al. A. Mickiewicza 30, 30-059 Krakow, Poland. zoladz@agh.edu.pl
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M
Zoladz
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Kmon
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P
Grybos
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Szczygiel
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R
Kleczek
P
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Otfinowski
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Rauza
D000200:Action Potentials / Q000502:physiology*; D000669:Amplifiers, Electronic; D000703:Analog-Digital Conversion; D011211:Electric Power Supplies; D004558:Electric Stimulation / Q000295:instrumentation*; D004569:Electroencephalography / Q000295:instrumentation*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D012666:Semiconductors; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation*; D059629:Signal-To-Noise Ratio