A low noise CMOS preamplifier for femtoampere current detection

被引：5

作者：

Zhang, Ming ^{[1
]}

Llaser, Nicolas ^{[1
]}

Mathias, Herve ^{[1
]}

机构：

[1] Univ Paris 11, CNRS, F-91405 Orsay, France

来源：

PROCEEDINGS OF 2008 IEEE INTERNATIONAL SYMPOSIUM ON CIRCUITS AND SYSTEMS, VOLS 1-10 | 2008年

关键词：

D O I：

10.1109/ISCAS.2008.4541862

中图分类号：

TP3 [计算技术、计算机技术];

学科分类号：

0812 ;

摘要：

This paper presents a low noise CMOS preamplifier for femtoampere detection. Based on a classical charge amplifier, a ping-pong technique is proposed to reset the charge amplifier, keeping the preamplifier stable even in a strong parasitic DC current. With a low reset frequency, the undesired folding noise is greatly reduced and the signal-to-noise ratio (SNR) at the output can be kept almost constant. The simulation results show that using the proposed preamplifier, the output SNR can still be 72 for an input current of 200fA among a parasitic DC current of 100pA. The dynamic range is observed over 120dB.

引用

页码：2094 / 2097

页数：4

共 6 条

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