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Content Provider | IET Digital Library |
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Author | Lee, K. H. Lee, D. Yoon, J. Kwon, O. Lee, J. |
Abstract | A pH-sensitive sensor with a differential mode was developed to detect surface charges accumulated on the ion-sensitive layer. The device accurately monitors the relative pH value using the modified instrumentation amplifier with the DC electrode-offset compensation. The readout voltage is digitalised with the current-starved ring oscillator. The sensor achieves the DC offset compensation of 22.5 dB and the oscillating pH sensitivity of 1.3 MHz/pH. The feasibility of the sensor is demonstrated to monitor the hydrogen ion concentration comparing the oscillation frequency at differential mode with that at single mode. |
Starting Page | 251 |
Ending Page | 253 |
Page Count | 3 |
ISSN | 00135194 |
Volume Number | 53 |
e-ISSN | 1350911X |
Issue Number | Issue 4, Feb (2017) |
Alternate Webpage(s) | https://digital-library.theiet.org/content/journals/el/53/4 |
Alternate Webpage(s) | https://digital-library.theiet.org/content/journals/10.1049/el.2016.3330 |
Journal | Electronics Letters |
Publisher Date | 2017-01-10 |
Access Restriction | Open |
Rights Holder | © The Institution of Engineering and Technology |
Subject Keyword | Amplifiers Charge Measurement Chemical Sensor Chemical Variables Measurement Compensation Current-starved Ring Current-starved Ring Oscillator DC Electrode-offset Compensation Differential PH-sensitive Sensor Digital Readout Voltage Electrochemical Electrodes Electrochemical Sensor Electrochemistry And Electrophoresis Gain 22.5 DB Hydrogen Ion Concentration Instrumentation Amplifier Instrumentation Amplifiers Ion-sensitive Layer Measurement of Basic Electric And Magnetic Variables Oscillator PH Measurement Readout Electronics Surface Charge Detection |
Content Type | Text |
Resource Type | Article |
Subject | Electrical and Electronic Engineering |
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