In this paper the design, fabrication and testing of a 10-channel array of identical amplifiers suitable for velocity selective electroneurogram (ENG) recording is described. The overall gain per channel is 10,000 and the total input-referred rms noise in a bandwidth 1 Hz-5 kHz is 290 nV per channel. The active area is 12 mm2 and the power consumption is 24 mW from ±2.5 V power supplies.
"The use of several hexagonal structures such as that presented above on a cuff electrode (see Fig. 5) could allow us to record more signals and thus increase the quantity of neural data. Furthermore, references ,  show that it is possible to extract the direction and the speed of the signal propagation of AP by using several successive poles. This principle is still relevant for our electrode and would thus allow us to obtain more accurate pieces of information about the direction and the speed of AP propagations. "
[Show abstract][Hide abstract] ABSTRACT: Sensory information coming from natural sensors and being propagated on afferent nerve fibers could be used as feedback for a more efficient closed-loop control of a functional electrical stimulation system. In order to extract and separate these signals according to their nerve fascicule origins, we propose a new architecture of a multipolar cuff electrode and an optimized integrated acquisition circuit. Concerning the electrode, we propose a specific configuration using a large number of poles in order to both reject parasitic signals, such as electromyogram and provide a maximum of recording channels in order to help the signal localization inside the nerve. Moreover, specific low-level analog signal processing was designed to extract the expected low-amplitude signal from its noisy environment. This signal processing is implemented in an ASIC that has to be implanted close to the electrode to achieve the best signal-to-noise ratio
[Show abstract][Hide abstract] ABSTRACT: With the advance in technology simultaneous recording of bio-signals from a large number of recording sites has become possible using multi-channel low-noise recording systems. However, the design of such systems poses a challenge, as operation at low power, provision of high gain in the presence of input offset voltages and excellent noise performance are mandatory. This paper highlights design strategies for recording system optimization and compares the performance of actual system implementations with the best-case performance achievable in theory. Special consideration is given to the noise vs. power and offset-tolerance vs. noise trade-off
International Symposium on Circuits and Systems (ISCAS 2007), 27-20 May 2007, New Orleans, Louisiana, USA; 01/2007
[Show abstract][Hide abstract] ABSTRACT: In order to extract and separate Action Potential (AP) signals according to their nerve fascicule origins, we propose a new architecture of a multipolar cuff electrode and an optimized integrated acquisition circuit. The proposed electrode has a specific layout of a large number of poles in order to both reject parasitic signals, such as electromyogram and provide a maximum of spatial selectivity for ENG signals. For one channel to be recorded, we need to consider seven recording sites. A low-noise integrated circuit (ASIC) has been designed in order to perform this first step of analog processing on each set of seven considered poles
Electronics, Circuits and Systems, 2007. ICECS 2007. 14th IEEE International Conference on; 01/2008
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