Programmable calibration circuit for a MIM-ISFET device

Guerrero, E.; Sanz-Pascual, M.T.; Molina, Joel; Medrano, N.; Calvo, B.; Antolín, D.

doi:10.1109/i2mtc.2012.6229398

Cited by 1 publication

(7 citation statements)

References 12 publications

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“…From then on, the ISFET became highly favored and was used as a chemical sensor in several different applications throughout the industry. It has been used in environmental, biochemical, aquaculture, biomedical, and food industries, to name a few, for data acquisition and pH level monitoring [1][2][3]6]. Figure 1 [12] illustrates the difference between the MOSFET and ISFET.…”

Section: Ion-sensitive Field-effect Transistor (Isfet)mentioning

confidence: 99%

“…Its broad application in environmental, agricultural, aquaculture, biomedical, pharmaceutical, food, and other industries makes it in demand and popular [1][2][3][4][5][6]. The ISFET is normally used for data acquisition and monitoring the potential of hydrogen (pH) levels [2,3,[6][7][8]. Characteristics of pH sensors vary in time because of the changes in its electrodes [7,8].…”

Section: Introductionmentioning

confidence: 99%

“…Characteristics of pH sensors vary in time because of the changes in its electrodes [7,8]. Changes in the performance of the electrodes might affect the accuracy of its measurements [3]. Monitoring of the pH level is necessary to avoid further chemical reactions in a substance [2,6,9].…”

Section: Introductionmentioning

confidence: 99%

“…ISFET devices have different sensitivities and linearity, which can be attributed to different sensing membranes and trapped charges. Through calibration, the sensitivity of the ISFET will be maintained; hence, the measurements will be accurate and reliable [3]. One way to minimize errors due to non-linearity is by using multiple calibration points such as the three-point calibration [10,11].…”

Section: Introductionmentioning

confidence: 99%

“…In such cases, an expert may be needed and a sequence of procedures should be followed [1]. The procedure of calibrating an ISFET includes the measurement of a known solution and of an unknown one [3,9]. The pH's equivalent voltage of a measured known solution is saved in the memory registers inside the system for reference during calibration [1,9].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Characterization of an ISFET with Built-in Calibration Registers through Segmented Eight-Bit Binary Search in Three-Point Algorithm Using FPGA

Manlises

Cruz

Chung

et al. 2017

JLPEA

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Sensors play the most important role in observing changes in an environment they are a part. They detect even the smallest changes and send the information to other electronic devices. Making sure that these sensors provide an accurate output is equally crucial, as the data it measures and collects are used for analysis. Until now, calibrating sensors has been done manually by following a sequence of procedures, and is usually performed on-site or in a laboratory prior to deployment. To eliminate the manual procedure in the calibration (at the very least), an ion-sensitive field-effect transistor (ISFET) with a built-in calibration registers circuit was created through segmented eight-bit binary search in a three-point algorithm using a field-programmable gate array (FPGA). The circuit was created using a three-point calibration algorithm and three standard buffers (pH 4, pH 7, and pH 10). The block diagram, schematic diagram, and the number of logic gates were derived after synthesizing the Verilog program in Xilinx/FPGA. An average of 0.30% error was computed to prove the reliability of the created circuit using FPGA. Having an ISFET with built-in calibration registers will alleviate the work of experts in performing calibrations. This would follow the plug and play standard, hence its being a calibration-ready ISFET device. With this feature, it could be used as a pH level meter or a remote sensor node in several applications.

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Section: Ion-sensitive Field-effect Transistor (Isfet)mentioning

confidence: 99%