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@inproceedings{Liu:2019:10.1109/iscas.2019.8702636,
author = {Liu, Y and Constandinou, TG and Georgiou, P},
doi = {10.1109/iscas.2019.8702636},
publisher = {IEEE},
title = {A 32 x 32 ISFET array with in-pixel digitisation and column-wise TDC for ultra-fast chemical sensing},
url = {http://dx.doi.org/10.1109/iscas.2019.8702636},
year = {2019}
}

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TY - CPAPER
AB - This paper presents a 32×32 ISFET sensing array with in-pixel digitisation for pH sensing. The in-pixel digitisation is achieved using an inverter-based sensing pixel that is controlled by a triangular waveform. This converts the pH response of the ISFET into a time-domain signal whilst also increasing dynamic range and thus the ability to tolerate sensor offset. The pixels are interfaced to a 15-bit asynchronous column-wise time-to-digital converter (TDC), enabling fast sensor readout whilst using minimal silicon area. Parallel output of 32 TDC interfaces are serialised to achieve fast data though-put. This system is implemented in a standard 0.18 μm standard CMOS technology, with a pixel size of 26 μm × 26 μm and a TDC of 26 μm × 180 μm. Simulation results demonstrate that chemical sampling of up to 5k frames per second can be achieved with a clock frequency of 160 MHz and a TDC resolution of 190 ps. The total power consumption of the overall system is 7.34 mW.
AU - Liu,Y
AU - Constandinou,TG
AU - Georgiou,P
DO - 10.1109/iscas.2019.8702636
PB - IEEE
PY - 2019///
SN - 0271-4302
TI - A 32 x 32 ISFET array with in-pixel digitisation and column-wise TDC for ultra-fast chemical sensing
UR - http://dx.doi.org/10.1109/iscas.2019.8702636
UR - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000483076402103&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR - http://hdl.handle.net/10044/1/72538
ER -

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