Novel Transimpedance amplifier for Noise Measurements on Bio-Electronic devices

2005 ◽  
Author(s):  
Giorgio Ferrari
Keyword(s):  
Electronic Devices ◽  
Transimpedance Amplifier ◽  
Noise Measurements

scholarly journals The Isotopx NGX and the ATONA Faraday Amplifiers

2020 ◽  
Author(s):  
Stephen E. Cox ◽  
Sidney R. Hemming ◽  
Damian Tootell
Keyword(s):  
Mass Spectrometer ◽  
Dynamic Range ◽  
Noble Gas ◽  
High Dynamic Range ◽  
High Gain ◽  
Low Noise ◽  
Transimpedance Amplifier ◽  
Noise Floor ◽  
Baseline Noise ◽  
Noise Measurements

Abstract. We installed the new Isotopx ATONA Faraday cup detector amplifiers on an Isotopx NGX mass spectrometer at Lamont-Doherty Earth Observatory in early 2018. The ATONA is a capacitive transimpedance amplifier, which differs from the traditional resistive transimpedance amplifier used on most Faraday detectors for mass spectrometry. Instead of a high gain resistor, a capacitor is used to accumulate and measure charge. The advantages of this architecture are a very low noise floor, rapid response time, stable baselines, and very high dynamic range. We show baseline noise measurements and measurements of argon from air and cocktail gas standards to demonstrate the capabilities of these amplifiers. The ATONA exhibits a noise floor better than a traditional 1013 Ω amplifier in normal noble gas mass spectrometer usage, superior gain and baseline stability, and an unrivaled dynamic range that makes it practical to measure beams ranging in size from below 10−16 A to above 10−9 A using a single amplifier.

Homemade-HEMT-based transimpedance amplifier for high-resolution shot-noise measurements

2021 ◽  
Vol 92 (12) ◽  
pp. 124712
Author(s):  
Takase Shimizu ◽  
Masayuki Hashisaka ◽  
Heorhii Bohuslavskyi ◽  
Takafumi Akiho ◽  
Norio Kumada ◽  
...  
Keyword(s):  
High Resolution ◽  
Shot Noise ◽  
Transimpedance Amplifier ◽  
Noise Measurements

The Development of a Cross-Flow Fan for Electronic Devices Cooling with a Focus on Laptop Computers

2014 ◽  
Vol 939 ◽  
pp. 577-583
Author(s):  
Ai Tsung Li ◽  
Ray Quen Hsu
Keyword(s):  
Acoustic Noise ◽  
Electronic Devices ◽  
Cross Flow ◽  
Optimal Number ◽  
Ansys Fluent ◽  
Laptop Computers ◽  
Fan Performance ◽  
2D Simulation ◽  
Noise Measurements ◽  
Cross Flow Fan

The directive is to develop a new type of cross-flow fan for cooling electronic devices. First, the module is based on the 60X60X6mm fan and attempts to use several parameters to enhance the fan’s performance. The parameters considered here include blade number, angle of the blade, impeller diameter, divergent structure, and outlet area. Both numerical and experimental analyses are carried out on the cross-flow fan which was oriented horizontally. The ANSYS Fluent software is used in a 2D simulation to predict the heat transfer coefficient and the flow fields. Next, the flow and acoustic noise measurements are carried out at different parameters with the aid of AMCA and semi-anechoic chambers. The results show that when the outlet vent size is 70% of fan outside diameter the outcome is an enhanced fan performance of 12%. The optimal number of blades is 37. A block is inserted below the fan blade to improve the fan performance by 8%. The numerical and experimental values of air flow were plotted and found to be consistent. In summary, this study provides a systematic process to develop a cross-flow fan that can meet the requirements for thin and light laptop computers.

scholarly journals The Isotopx NGX and ATONA Faraday amplifiers

Geochronology ◽  
2020 ◽  
Vol 2 (2) ◽  
pp. 231-243
Author(s):  
Stephen E. Cox ◽  
Sidney R. Hemming ◽  
Damian Tootell
Keyword(s):  
Mass Spectrometer ◽  
Dynamic Range ◽  
Noble Gas ◽  
High Dynamic Range ◽  
High Gain ◽  
Low Noise ◽  
Transimpedance Amplifier ◽  
Noise Floor ◽  
Baseline Noise ◽  
Noise Measurements

Abstract. We installed the new Isotopx ATONA Faraday cup detector amplifiers on an Isotopx NGX mass spectrometer at Lamont-Doherty Earth Observatory in early 2018. The ATONA is a capacitive transimpedance amplifier, which differs from the traditional resistive transimpedance amplifier used on most Faraday detectors for mass spectrometry. Instead of a high-gain resistor, a capacitor is used to accumulate and measure charge. The advantages of this architecture are a very low noise floor, rapid response time, stable baselines, and very high dynamic range. We show baseline noise measurements and measurements of argon from air and cocktail gas standards to demonstrate the capabilities of these amplifiers. The ATONA exhibits a noise floor better than a traditional 1013 Ω amplifier in normal noble gas mass spectrometer usage, superior gain and baseline stability, and an unrivaled dynamic range that makes it practical to measure beams ranging in size from below 10−16 to above 10−9 A using a single amplifier.

Atom-probe analysis of the solid-liquid interface

1995 ◽  
Vol 53 ◽  
pp. 676-677
Author(s):  
J.A. Panitz
Keyword(s):  
Molecular Level ◽  
Selective Adsorption ◽  
Electronic Devices ◽  
Atom Probe ◽  
Chemical Agent ◽  
Hostile Environment ◽  
Solid Interface ◽  
Solid Liquid Interface ◽  
Solid Liquid ◽  
Chemically Selective

The first few atomic layers of a solid can form a barrier between its interior and an often hostile environment. Although adsorption at the vacuum-solid interface has been studied in great detail, little is known about adsorption at the liquid-solid interface. Adsorption at a liquid-solid interface is of intrinsic interest, and is of technological importance because it provides a way to coat a surface with monolayer or multilayer structures. A pinhole free monolayer (with a reasonable dielectric constant) could lead to the development of nanoscale capacitors with unique characteristics and lithographic resists that surpass the resolution of their conventional counterparts. Chemically selective adsorption is of particular interest because it can be used to passivate a surface from external modification or change the wear and the lubrication properties of a surface to reflect new and useful properties. Immunochemical adsorption could be used to fabricate novel molecular electronic devices or to construct small, “smart”, unobtrusive sensors with the potential to detect a wide variety of preselected species at the molecular level. These might include a particular carcinogen in the environment, a specific type of explosive, a chemical agent, a virus, or even a tumor in the human body.

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