CMOS Transimpedance Amplifier for Biosensor Signal Acquisition

被引：0
|
作者：
Ibrahim, Mark M. R. [1 ]
Levine, Peter M. [1 ]
机构：
[1] Univ Waterloo, Dept Elect & Comp Engn, Waterloo, ON N2L 3G1, Canada
来源：
2014 IEEE INTERNATIONAL SYMPOSIUM ON CIRCUITS AND SYSTEMS (ISCAS) | 2014年
关键词：
D O I：
暂无
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：
We present a 1-G Omega CMOS transimpedance amplifier (TIA) suitable for processing sub-nA-level currents in electrochemical biosensor signal-acquisition circuits. Use of a two-stage active transconductor provides resistive feedback in place of a single large-area linear resistor. We engineer the TIA feedback loop to suppress output offset caused by dc input leakage currents of +/- 0.9 nA. We also implement a mechanism to tune the low-frequency cutoff of the TIA from 0.7 Hz to 500 Hz which permits operation under variable environmental conditions. We report simulated and experimental results from our custom TIA fabricated in a 3.3-V 0.35-mu m CMOS process.
引用
收藏
页码：25 / 28
页数：4
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