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In applications where MEMS accelerometers are used to acquire precision displacement data, the cumulative effect of the necessary double integration almost always exaggerates even minor inaccuracies, yielding sizable offset errors in the resulting displacement trends. The acquisition of reliable displacement data therefore presents a real challenge as many of the underlying causes of error are commonly...
A spiking chemical sensor (SCS) is presented for detection of neurogenic ion concentration associated with active nerve fibres in nerve bundles. Based on the "integrate-and-fire" circuit, the SCS uses a chemically-modified ISFET front end encoding the sense data in the spike domain. Used in an array, it provides a spatio-temporal map of chemical activity around the nerve bundle which may...
The output signal-to-interference (ENG/EMG) ratio of amplifier configurations connected to tripolar nerve cuff electrodes is affected by systematic interface errors which severely degrade neural recordings. These errors are contained in the term "cuff imbalance" and known causes include inhomogeneous tissue growth after cuff implantation and cuff manufacturing tolerances. In this paper we...
This paper describes the realisation of an automatic control system for use in nerve cuff recordings. The system compensates for any impedance mismatches in the cuff by adaptively adjusting the gains of the input differential amplifiers connected to the cuff electrodes. As a result, interference pick-up during nerve recordings is greatly reduced. The gains of the variable gain amplifiers are adjusted...
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