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Low-power spiking chemical pixel sensor

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3 Author(s)
P. Georgiou ; Inst. of Biomed. Eng., Imperial Coll. London ; T. G. Constandinou ; C. Toumazou

An ISFET-based integrate and fire neuron, forming the front-end of a chemical pixel sensor, is introduced. With the sense data being encoded in the spike domain, i.e. asynchronous/continuous time and discrete value, it is directly compatible with asynchronous communication hardware, e.g. address event representation. The circuit is shown to be tunable to yield a linear relation with both pH and actual hydrogen ion concentration, with a peak power consumption of 35 muW. Furthermore, its compact pixel footprint of under 6500 mum2, makes it ideal for use in arrayed architectures with application in biochemical imaging

Published in:

Electronics Letters  (Volume:42 ,  Issue: 23 )