A Multi-Sensing Pixel for Integrated Opto-Chemical Sensing with Temperature Compensation

He, Minghuai; Moser, Nicolas; Georgiou, Pantelis

doi:10.1109/iscas45731.2020.9181098

Cited by 6 publications

(4 citation statements)

References 9 publications

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“…Due to that reason the research focus has been on developing robust compensation methods at the expense of deriving an accurate analytical temperature dependence model. Various temperature compensation schemes have been tried in literature, but these do not provide robust temperature compensation [32][33][34][35].…”

Section: ) Temperature Effectmentioning

confidence: 99%

ISFET Pixel Array With Selectable Sensitivity and Bulk-Based Offset-Drift Nullification Capability for Reduction of Non-Ideality Effects

Prathap

Titus

2023

IEEE Sensors J.

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This paper presents a monolithic, cost-effective, label free, low power, robust 3x2 fully differential ISFET pixel array aimed at pH sensing. Each pixel is based on a differential readout architecture which eliminates need for additional non-ideality compensation circuitry. Additionally, the design offers the capability to correct for residual drift and trapped charge offset through substrate-based voltage adjustment during calibration. The design also provides a unique ability for selecting pH sensitivity according to the desired mode of operation which has not been demonstrated previously. We present experimental results obtained from the pixel array fabricated in an unmodified AMS 0.35μm CMOS process using a 3.3V power supply. Each pixel demonstrates a differential sensitivity of 61mV/pH when operated in high sensitivity mode and 25mV/pH when operated in high non-ideality rejection mode over the entire pH range, with the ability to remove the already small drift of 0.3 mV/min and any offset mismatch by adjusting the substrate voltage.

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Section: ) Temperature Effectmentioning

confidence: 99%

ISFET Pixel Array With Selectable Sensitivity and Bulk-Based Offset-Drift Nullification Capability for Reduction of Non-Ideality Effects

Prathap

Titus

2023

IEEE Sensors J.

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Section: ) Temperature Effectmentioning

confidence: 99%

ISFET Pixel Array With Selectable Sensitivity and Bulk-Based Offset-Drift Nullification Capability for Reduction of Non-Ideality Effects

Prathap¹

2023

Preprint

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<p>This paper presents a monolithic, cost-effective, label free, low power, robust 3x2 fully differential ISFET pixel array aimed at pH sensing. Each pixel is based on a differential readout architecture which eliminates need for additional non-ideality compensation circuitry. Additionally, the design offers the capability to correct for residual drift and trapped charge offset through substrate-based voltage adjustment during calibration. The design also provides a unique ability for selecting pH sensitivity according to the desired mode of operation which has not been demonstrated previously. We present experimental results obtained from the pixel array fabricated in an unmodified AMS 0.35μm CMOS process using a 3.3V power supply. Each pixel demonstrates a differential sensitivity of 61mV/pH when operated in high sensitivity mode and 25mV/pH when operated in high non-ideality rejection mode over the entire pH range, with the ability to remove the already small drift of 0.3 mV/min and any offset mismatch by adjusting the substrate voltage </p>

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“…Throughout the literature, several papers have explored the opportunities of multisensing on ISFET platforms, achieving in-pixel thermo-chemical [11], opto-chemical [12], and optothermo-chemical sensing [13]. Although these architectures explore individual combinations of sensors, no unified solution has been proposed so far that accommodates all sensing modalities with no transmission overhead.…”

Section: Introductionmentioning

confidence: 99%

A Multi-Sensing ISFET Array for Simultaneous In-Pixel Detection of Light, Temperature, Moisture and Ions

Hua

Cacho-Soblechero

Georgiou

2021

2021 IEEE International Symposium on Circuits and Systems (ISCAS)

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This paper presents a multi-sensing pixel capable of sensing ion concentration, temperature, moisture and light from the same spatial point. The presented pixel is composed of an ISFET chemical sensor, a light sensor, a moisture sensor and a temperature sensor, all implemented in standard CMOS technology in a compact pixel. All sensing modalities are acquired simultaneously and modulated onto a single waveform using multi-frequency PWM modulation, overcoming the associated transmission overhead. Furthermore, ISFET non-idealities such as trapped charge are compensated through a global DAC, balancing the input linear OTA, while the light sensor dark current is mitigated in-pixel by subtracting its influence using a reference photodiode. The proposed pixel occupies 50x50 µm 2 , and it is integrated as part of a 4x4 multi-sensing array, along with on-chip biasing, instrumentation and digital control. To the best of our knowledge, this architecture represents the first multisensing architecture capable of extracting four features from the same spatial point simultaneously, enabling ISFET-based platforms to sense both the chemical signal and the external conditions influencing its measurement.

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A Multi-Sensing Pixel for Integrated Opto-Chemical Sensing with Temperature Compensation

Cited by 6 publications

References 9 publications

ISFET Pixel Array With Selectable Sensitivity and Bulk-Based Offset-Drift Nullification Capability for Reduction of Non-Ideality Effects

ISFET Pixel Array With Selectable Sensitivity and Bulk-Based Offset-Drift Nullification Capability for Reduction of Non-Ideality Effects

ISFET Pixel Array With Selectable Sensitivity and Bulk-Based Offset-Drift Nullification Capability for Reduction of Non-Ideality Effects

A Multi-Sensing ISFET Array for Simultaneous In-Pixel Detection of Light, Temperature, Moisture and Ions

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