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A switched-capacitor front-end for velocity-selective ENG recording
1Electrical Engineering Department, National Sun Yat-Sen University, 804 Kaohsiung, Taiwan. rrieger@mail.nsysu.edu.tw
IEEE Transactions on Biomedical Circuits and Systems
|July 30, 2013
Summary
This study introduces analog switched-capacitor circuits for velocity selective recording (VSR) using multi-electrode cuffs. This innovation reduces size and power consumption for nerve signal analysis.
Area of Science:
- Biomedical Engineering
- Neuroscience
- Signal Processing
Background:
- Multi-electrode cuffs (MECs) offer potential for enhanced nerve signal analysis.
- Velocity selective recording (VSR) aims to extract axon population velocity information.
Purpose of the Study:
- To implement a VSR system using analog switched-capacitor (SC) delay lines.
- To achieve significant size and power savings compared to digital VSR systems.
Main Methods:
- Replacement of digital signal processing with analog SC delay lines.
- Design and evaluation of two low-noise preamplifier circuits with 2nd rank SC gain stages (single-ended and fully differential).
- Fabrication of circuits using 0.8 μm CMOS technology.
Main Results:
- Both single-ended and fully differential SC systems demonstrated low-noise, low-power operation.
- Achieved practically identical channel gains and sample delay ranges suitable for VSR.
- Measured results from fabricated CMOS chips validate the approach.
Conclusions:
- Analog SC delay lines are a viable and efficient alternative for VSR implementation.
- The developed circuits meet the necessary specifications for effective velocity selective recording.
- This approach offers practical advantages in size and power for neural signal processing.
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