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![Mingzheng Duan Headshot](https://confcats-catavault.s3.amazonaws.com/CATAVault/ieeecass/master/files/styles/cc_user_photo/s3/user-pictures/19601_0.jpg?h=ee558c48&itok=eXQBDKv8)
- Affiliation
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AffiliationHong Kong University of Science and Technology
- Country
This paper presents a high sensitivity and high frame rate hydrogen ion image sensor in standard CMOS process for high accuracy and high throughput hydrogen ion monitoring. A novel ion-to-current-to-voltage sensing front-end using 2-transistor (2T) and a column capacitive transimpedance instrumentation amplifier (CTIA) enable high pixel density, high sensitivity and rapid response time. A column successive approximate register (SAR)-Single Slope (SS) dual-mode analog-to-digital converter (ADC) is employed as it outperforms SS ADC on quantization speed and power efficiency while occupies less chip area to be able to fit in a pixel column compared with SAR ADC. Due to the novel sensing front-end and dual-mode ADC employed, the proposed CMOS ion image sensor system achieves a simulated 191mV/pH sensitivity and 2219 fps frame rate.