Differential pH-sensitive sensor with DC electrode-offset compensation

被引：4
|
作者：
Lee, K. H. [1 ]
Lee, D. [1 ]
Yoon, J. [1 ]
Kwon, O. [1 ]
Lee, J. [2 ]
机构：
[1] Korea Inst Machinery & Mat, Daegu Res Ctr Med Devices & Rehab Engn, Daegu 42994, South Korea
[2] Korea Inst Machinery & Mat, Nanomech Syst, Daejeon 34103, South Korea
来源：
ELECTRONICS LETTERS | 2017年 / 53卷 / 04期
关键词：
pH measurement; compensation; electrochemical electrodes; electrochemical sensors; charge measurement; instrumentation amplifiers; oscillators; readout electronics; differential pH-sensitive sensor; DC electrode-offset compensation; surface charge detection; ion-sensitive layer; instrumentation amplifier; digital readout voltage; current-starved ring; current-starved ring oscillator; hydrogen ion concentration; gain; 22; 5; dB; ISFET;
D O I：
10.1049/el.2016.3330
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
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.
引用
收藏
页码：251 / 253
页数：2
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