Next Article in Journal
Power Scalable Radio Receiver Design Based on Signal and Interference Condition
Previous Article in Journal
Heavy Ion Characterization of a Radiation Hardened Flip-Flop Optimized for Subthreshold Operation. J. Low Power Electron. Appl. 2012, 2, 168-179
Article Menu

Export Article

Open AccessArticle
J. Low Power Electron. Appl. 2012, 2(4), 211-241; doi:10.3390/jlpea2040211

A Multi-Channel Low-Power System-on-Chip for in Vivo Recording and Wireless Transmission of Neural Spikes

1
Dipartimento di Elettronica e Informazione, Politecnico di Milano, Via Golgi 40, Milano 20133, Italy
2
Italian Institute of Technology (IIT), Department of Robotic, Brain and Cognitive Science, Genova 16163, Italy
Present address: STMicroelectronics, Via Tolomeo, Cornaredo 20010, Italy.
*
Author to whom correspondence should be addressed.
Received: 11 June 2012 / Revised: 6 September 2012 / Accepted: 21 September 2012 / Published: 28 September 2012

Abstract

This paper reports a multi-channel neural spike recording system-on-chip with digital data compression and wireless telemetry. The circuit consists of 16 amplifiers, an analog time-division multiplexer, a single 8 bit analog-to-digital converter, a digital signal compression unit and a wireless transmitter. Although only 16 amplifiers are integrated in our current die version, the whole system is designed to work with 64, demonstrating the feasibility of a digital processing and narrowband wireless transmission of 64 neural recording channels. Compression of the raw data is achieved by detecting the action potentials (APs) and storing 20 samples for each spike waveform. This compression method retains sufficiently high data quality to allow for single neuron identification (spike sorting). The 400 MHz transmitter employs a Manchester-Coded Frequency Shift Keying (MC-FSK) modulator with low modulation index. In this way, a 1:25 Mbit/s data rate is delivered within a limited band of about 3 MHz. The chip is realized in a 0:35 µm AMS CMOS process featuring a 3 V power supply with an area of 3:1 x 2:7 mm2. The achieved transmission range is over 10 m with an overall power consumption for 64 channels of 17:2 mW. This figure translates into a power budget of 269 µW per channel, in line with published results but allowing a larger transmission distance and more efficient bandwidth occupation of the wireless link. The integrated circuit was mounted on a small and light board to be used during neuroscience experiments with freely-behaving rats. Powered by 2 AAA batteries, the system can continuously work for more than 100 hours allowing for long-lasting neural spike recordings.
Keywords: neural recording; action potential; low-noise amplifier; wireless transmitter; bio-telemetry; FSK; Manchester-encoding neural recording; action potential; low-noise amplifier; wireless transmitter; bio-telemetry; FSK; Manchester-encoding
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

Scifeed alert for new publications

Never miss any articles matching your research from any publisher
  • Get alerts for new papers matching your research
  • Find out the new papers from selected authors
  • Updated daily for 49'000+ journals and 6000+ publishers
  • Define your Scifeed now

SciFeed Share & Cite This Article

MDPI and ACS Style

Bonfanti, A.; Ceravolo, M.; Zambra, G.; Gusmeroli, R.; Baranauskas, G.; Angotzi, G.N.; Vato, A.; Maggiolini, E.; Semprini, M.; Spinelli, A.S.; Lacaita, A.L. A Multi-Channel Low-Power System-on-Chip for in Vivo Recording and Wireless Transmission of Neural Spikes. J. Low Power Electron. Appl. 2012, 2, 211-241.

Show more citation formats Show less citations formats

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
J. Low Power Electron. Appl. EISSN 2079-9268 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top