scholarly journals A 50nV/√Hz 2‐channel time multiplexed bio‐chopper amplifier with current‐attenuated feedback resistor

2021 ◽  
Author(s):  
Beomjin Yuk ◽  
Byeongseol Kim ◽  
Joonsung Bae
Keyword(s):  
Chopper Amplifier ◽  
Feedback Resistor

Noise Analysis and Simulation of Chopper Amplifier

2006 ◽  
Author(s):  
Tao Yin ◽  
Haigang Yang ◽  
Quan Yuan ◽  
Guoping Cui
Keyword(s):  
Noise Analysis ◽  
Chopper Amplifier

scholarly journals On the Performance of an Aerosol Electrometer with Enhanced Detection Limit

Sensors ◽  
2018 ◽  
Vol 18 (11) ◽  
pp. 3889 ◽  
Author(s):  
Yixin Yang ◽  
Tongzhu Yu ◽  
Jiaoshi Zhang ◽  
Jian Wang ◽  
Wenyu Wang ◽  
...  
Keyword(s):  
Detection Limit ◽  
Detection Efficiency ◽  
Particle Diameter ◽  
Electrical Current ◽  
Statistical Correlation ◽  
Measurement Noise ◽  
Mean Square ◽  
Particle Detection ◽  
Faraday Cup ◽  
Feedback Resistor

An aerosol electrometer with enhanced detection limit was developed for measuring the collected particles electrical current ranging from −50 pA to 50 pA with no range switching necessary. The detection limit was enhanced by suppressing the electric current measurement noise and improving the detection efficiency. A theoretical model for the aerosol electrometer has been established to investigate the noise effect factors and verified experimentally. The model showed that the noise was a function of ambient temperature, and it was affected by the characteristics of feedback resistor and operational amplifier simultaneously. The Faraday cup structure of the aerosol electrometer was optimized by adopting a newly designed cup-shaped metal filter which increased the surface area of the cup; thus the particle interception efficiency was improved. The aerosol electrometer performance-linearity, noise and the particle detection efficiency, were evaluated experimentally. When compared with TSI-3068B, a 99.4% ( R 2 ) statistical correlation was achieved. The results also showed that the root mean square noise and the peak-to-peak noise were 0.31 fA and 1.55 fA, respectively. The particle detection efficiency was greater than 99.3% when measuring particle diameter larger than 7.0 nm.

scholarly journals A Low-Noise Chopper Amplifier Designed for Multi-Channel Neural Signal Acquisition

2019 ◽  
Vol 54 (8) ◽  
pp. 2255-2265 ◽  
Author(s):  
Deng Luo ◽  
Milin Zhang ◽  
Zhihua Wang
Keyword(s):  
Low Noise ◽  
Signal Acquisition ◽  
Neural Signal ◽  
Chopper Amplifier

Emission Regulator Designed for Mass Spectrometer using a Chopper Amplifier

1960 ◽  
Vol 31 (10) ◽  
pp. 1153-1155 ◽  
Author(s):  
W. Corfield ◽  
H. McCullough ◽  
J. Lipson
Keyword(s):  
Mass Spectrometer ◽  
Chopper Amplifier
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