Wide bandwidth transimpedance amplifier for extremely high sensitivity continuous measurements
Wide bandwidth transimpedance amplifier for extremely high sensitivity continuous measurements
复制标题
DOI：
10.1063/1.2778626
复制
发表时间：
2007-09-01
影响因子：
1.6
通讯作者：
Sampietro, Marco
中科院分区：
文献类型：
--
作者：
Ferrari, Giorgio;Sampietro, Marco
本文介绍了一种基于积分器和微分器级的宽带互阻抗放大器，具有额外的反馈回路，用于从被测器件（DUT）释放驻电流，以确保与开关放电配置相比具有无限的测量时间机会，同时在整个带宽上保持大信号放大。该放大器在0.6 Hz至1.4 MHz范围内具有平坦响应，能够在DUT泄漏电流高达数十纳安的情况下工作，并且具有独立于DUT泄漏电流的正弦电流信号的轨到轨动态范围。还提供了一个稳定电流的监测输出，以跟踪实验缓慢漂移。该电路是理想的噪声光谱和纳米器件和生物分子的阻抗测量时，在存在的生理介质，并在所有情况下，要求高灵敏度电流测量，如在扫描探针显微镜系统。(c)2007年，美国物理学会。
This article presents a wide bandwidth transimpedance amplifier based on the series of an integrator and a differentiator stage, having an additional feedback loop to discharge the standing current from the device under test (DUT) to ensure an unlimited measuring time opportunity when compared to switched discharge configurations while maintaining a large signal amplification over the full bandwidth. The amplifier shows a flat response from 0.6 Hz to 1.4 MHz, the capability to operate with leakage currents from the DUT as high as tens of nanoamperes, and rail-to-rail dynamic range for sinusoidal current signals independent of the DUT leakage current. Also available is a monitor output of the stationary current to track experimental slow drifts. The circuit is ideal for noise spectral and impedance measurements of nanodevices and biomolecules when in the presence of a physiological medium and in all cases where high sensitivity current measurements are requested such as in scanning probe microscopy systems. (c) 2007 American Institute of Physics.