Wide Input Dynamic Range Fully Integrated Capacitive Sensor for Life Science Applications

Tabrizi, Hamed Osouli; Farhanieh, Omid; Owen, Q.; Magierowski, Sebastian; Ghafar-Zadeh, Ebrahim

doi:10.1109/tbcas.2021.3075348

Cited by 12 publications

(3 citation statements)

References 47 publications

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“…Within our group's extensive research we have introduced a series of core-CBCM capacitive sensors explicitly developed for monitoring a spectrum of liquid samples characterized by diverse dielectric constants, encompassing water [31], ethanol [32], methanol [31,33], propanol [31], dichloromethane [31,33], and acetone [31,33]. Our previous work, detailed in [31], involves the introduction of a wide dynamic range core-CBCM capacitive-to-digital converter (CDC) featuring two electrodes. This design is marked by its versatility, enabling the sensor to precisely capture dynamic variations in droplets with a greater thickness during the evaporation process.…”

Section: Related Workmentioning

confidence: 99%

“…This paper highlights the advantages of the CBCM capacitive sensor array implemented in CMOS technology, emphasizing its increased accuracy in analyzing micro-liter droplet solutions. Within our group's extensive research we have introduced a series of core-CBCM capacitive sensors explicitly developed for monitoring a spectrum of liquid samples characterized by diverse dielectric constants, encompassing water [31], ethanol [32], methanol [31,33], propanol [31], dichloromethane [31,33], and acetone [31,33]. Our previous work, detailed in [31], involves the introduction of a wide dynamic range core-CBCM capacitive-to-digital converter (CDC) featuring two electrodes.…”

Section: Related Workmentioning

confidence: 99%

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A Multidisciplinary Approach toward CMOS Capacitive Sensor Array for Droplet Analysis

Osouli Tabrizi,

Forouhi,

Azadmousavi

et al. 2024

Micromachines

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This paper introduces an innovative method for the analysis of alcohol–water droplets on a CMOS capacitive sensor, leveraging the controlled thermal behavior of the droplets. Using this sensing method, the capacitive sensor measures the total time of evaporation (ToE), which can be influenced by the droplet volume, temperature, and chemical composition. We explored this sensing method by introducing binary mixtures of water and ethanol or methanol across a range of concentrations (0–100%, with 10% increments). The experimental results indicate that while the capacitive sensor is effective in measuring both the total ToE and dielectric properties, a higher dynamic range and resolution are observed in the former. Additionally, an array of sensing electrodes successfully monitors the droplet–sensor surface interaction. However practical considerations such as the creation of parasitic capacitance due to mismatch, arise from the large sensing area in the proposed capacitive sensors and other similar devices. In this paper, we discuss this non-ideality and propose a solution. Also, this paper showcases the benefits of utilizing a CMOS capacitive sensing method for accurately measuring ToE.

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Section: Related Workmentioning

confidence: 99%

Section: Related Workmentioning

confidence: 99%

A Multidisciplinary Approach toward CMOS Capacitive Sensor Array for Droplet Analysis

Osouli Tabrizi,

Forouhi,

Azadmousavi

et al. 2024

Micromachines

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“…CMOS technology enables the bulky and expensive instrumentation to be effectively integrated into a low-cost chip, and providing an accurate platform to measure physical changes comes from biological activity. CMOS sensors can be classified into various types based on the detection systems such as electro-chemical [10][11][12][13][14], optical [15][16][17][18][19], magnetic [20][21][22][23][24][25][26][27][28][29][30][31], mechanical [32,33], and thermal [34][35][36][37].…”

Section: Introductionmentioning

confidence: 99%

Design and Analysis of a Low-Voltage VCO: Reliability and Variability Performance

Azadmousavi,

Ghafar-Zadeh

2023

Micromachines

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This paper investigates an adaptive body biasing (ABB) circuit to improve the reliability and variability of a low-voltage inductor–capacitor (LC) voltage-controlled oscillator (VCO). The ABB circuit provides VCO resilience to process variability and reliability variation through the threshold voltage adjustment of VCO’s transistors. Analytical equations considering the body bias effect are derived for the most important relations of the VCO and then the performance is verified using the post-layout simulation results. Under a 0.16% threshold voltage shift, the sensitivity of the normalized phase noise and transconductance of the VCO with the ABB circuit compared to the constant body bias (CBB) decreases by around 8.4 times and 3.1 times, respectively. Also, the sensitivity of the normalized phase noise and transconductance of the proposed VCO under 0.16% mobility variations decreases by around 1.5 times and 1.7 times compared to the CBB, respectively. The robustness of the VCO is also examined using process variation analysis through Monte Carlo and corner case simulations. The post-layout results in the 180 nm CMOS process indicate that the proposed VCO draws a power consumption of only 398 µW from a 0.6 V supply when the VCO frequency is 2.4 GHz. It achieves a phase noise of −123.19 dBc/Hz at a 1 MHz offset and provides a figure of merit (FoM) of −194.82 dBc/Hz.

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Novel CMOS Thermo-Capacitive Sensing Method for Lab-on-Chip Applications

Forouhi,

Tabrizi,

Panahi

et al. 2023

2023 IEEE Biomedical Circuits and Systems Conference (BioCAS)

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Wide Input Dynamic Range Fully Integrated Capacitive Sensor for Life Science Applications

Cited by 12 publications

References 47 publications

A Multidisciplinary Approach toward CMOS Capacitive Sensor Array for Droplet Analysis

A Multidisciplinary Approach toward CMOS Capacitive Sensor Array for Droplet Analysis

Design and Analysis of a Low-Voltage VCO: Reliability and Variability Performance

Novel CMOS Thermo-Capacitive Sensing Method for Lab-on-Chip Applications

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