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Minimal readout scheme for ISFET sensing arrays based on pulse width modulation

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PROJECT TITLE :

Minimal readout scheme for ISFET sensing arrays based on pulse width modulation

ABSTRACT:

Proposed is an ISFET readout scheme with minimum analogue components to minimise parasitic and noise effects in large-scale chemical sensing arrays. For each array pixel, a pair of complementary ISFETs shares the same floating gate in an inverter configuration. An additional electrical input is capacitively coupled to the same floating gate with a periodic reference signal input. In this way, the conventional ISFET analogue output is replaced by a chemically controlled pulse width modulated signal. Theoretical analysis and experimental results show a pulse width pH sensitivity of around 6%, of the input reference signal period, per pH. This is achieved along with %1%V offset suppressing capability.


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Minimal readout scheme for ISFET sensing arrays based on pulse width modulation - 4.9 out of 5 based on 71 votes

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