DVCC based Readout Circuitry for Water Quality Monitoring System

Whig, Pawan; Ahmad, Syed Naseem

doi:10.5120/7900-1162

Cited by 11 publications

(11 citation statements)

References 13 publications

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“…R 2 : If temperature is medium [20][21][22][23][24][25][26][27][28][29][30] and sensor output is low [5][6][7][8][9][10].…”

Section: Photo Catalysis Sensormentioning

confidence: 99%

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Controlling the Output Error for Photo Catalytic Sensor (PCS) Using Fuzzy Logic

Whig¹,

Sn²

2017

J Earth Sci Clim Change

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This paper presents novel method to control output error of the Photo Catalytic Sensor (PCS) using fuzzy interface. Whig and Ahmad in 2014, proposed the spice model of PCS which is a type of ion sensitive FET and very useful to estimate the parameter BOD (Biological Oxygen Demand) which is generally used to estimate quality of water. PCS can also be used to calculate the amount of concentration level of oxygen required to purify the polluted air and sanitization of surface. The purpose to control the output error due to variation in temperature is due to the fact that the fluctuation of O 2 influence the threshold voltage, which is internal parameter of FET can manifest itself as a voltage signal at output but as a function of trans conductance gain. Hence, a system controlled by fuzzy logic which control the output error is proposed. This novel method is very useful because of their simplicity, robustness and successful practical applications. The proposed system is fast in operation which is further helpful for PCS which operates under sub-threshold conditions and reduced computation time. The system is user friendly and the outcomes of simulation are fairly in agreement with the theoretical estimation.

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“…R 2 : If temperature is medium [20][21][22][23][24][25][26][27][28][29][30] and sensor output is low [5][6][7][8][9][10].…”

Section: Photo Catalysis Sensormentioning

confidence: 99%

“…Fuzzy inference engine (FIS) using inference method maps the fuzzy sets in the input space to the output space using fuzzy logic. Fuzzifier and defuzzifier transform the input variables to the fuzzy sets and vice versa respectively [23].…”

Section: Fuzzy Implementationsmentioning

confidence: 99%

Controlling the Output Error for Photo Catalytic Sensor (PCS) Using Fuzzy Logic

Whig¹,

Sn²

2017

J Earth Sci Clim Change

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“…The electron produced as a result of phenomena then reacts with oxygen in the sample to form O À 2 and hole reacts with surface hydroxyl groups to form OH radicals. 10 The radical species then attack the organic molecule and oxidized the organic molecules into carbon dioxide and water. Also, it will produce HCl if the organic molecule contains chlorine.…”

Section: Semiconductor Photo Catalysismentioning

confidence: 99%

Development of Economical Asic for PCS for Water Quality Monitoring

Whig

Ahmad

2014

J CIRCUIT SYST COMP

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In this paper, the design of an ASIC is presented that implement a low-cost system for the supervision of water quality in urban areas or rivers. Photo catalytic sensor (PCS) estimates the parameter biological oxygen demand (BOD) which is generally used to estimate quality of water. The system proposed in this paper involves a simple potentiometric approach that provides a correlation in the input-output signals of low-cost sensors. This approach which is more users friendly and fast in operation is obtained by modeling and optimization of sensor for water quality monitoring. This is to overcome several drawbacks generally found in the previous°o w injection analysis method of determining chemical oxygen demand (COD)-like complex designing, nonlinearity and long computation time. The system constitutes a signi¯cant cost reduction in the supervision of water quality monitoring. The main reason of employing a readout circuit to PCS circuitry, is the fact that the°uctuation of O 2 in°uences the threshold voltage, which is internal parameter of the FET and can manifest itself as a voltage signal at output but as a function of the trans-conductance gain. The trans-conductance is a passive parameter and in order to derive voltage or current signal from its°uctuations the sensor has to be attached to readout circuit. This circuit provides high sensitivity to the changes in percentage of O 2 in the solution. In this design simple potentiometric approach with few passive components are used to build a readout circuit. The paper focuses on the electronic implementation of the readout system for the PCS which optimize the circuit performance and increases reliability.

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“…At the interface between the gate insulator and the solution, there is an electric potential difference that depends on the concentration of H+ of the solution, or so called, pH value. The variation of this potential caused by the pH variation will lead to modulation of the drain current [8][9][10]. As a result, the I d -V gs transfer characteristic of the ISFET, working in triode region, can be observed similarly with that of MOSFET:…”

Section: Figure 1 Sub Circuit Block Of Isfet Macro Modelmentioning

confidence: 99%

CMOS Integrated VDBA-ISFET Device for Water Quality Monitoring

Whig¹,

Ahmad²

2014

IJIES

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The paper presents a performance analysis of low power CMOS Integrated "Voltage Differencing Buffered Amplifier Ion Sensitive Field Effect Transistor" (VDBA-ISFET). The main focus is on simulation of power and performance analysis along with the comparison with existing devices, which is used for water quality monitoring. This approach can improve the calibration of device to a fairly wide range without the use of a high speed digital processor. The conventional devices generally used consume high power and are not stable for long term monitoring. The conventional device has a drawback of low value of slew rate, high power consumption, and non linear characteristics but in this novel design, the device exhibits a better slew rate, piece-wise linear characteristics, and seen consuming low power of the order of 11.3µW. The functionality of the circuit is tested using Tanner simulator version 15 for CMOS process model. The proposed circuit reduces total power consumption per cycle, increases speed of operation, fairly linear and is simple to implement.This device has a simple architecture, and hence is very suitable for water quality monitoring applications.

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DVCC based Readout Circuitry for Water Quality Monitoring System

Cited by 11 publications

References 13 publications

Controlling the Output Error for Photo Catalytic Sensor (PCS) Using Fuzzy Logic

Controlling the Output Error for Photo Catalytic Sensor (PCS) Using Fuzzy Logic

Development of Economical Asic for PCS for Water Quality Monitoring

CMOS Integrated VDBA-ISFET Device for Water Quality Monitoring

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