scholarly journals A 24 A, 100 kHz transconductance amplifier with stable current output constructed at Inmetro

2021 ◽  
Vol 18 ◽  
pp. 100064
Author(s):  
Gregory A. Kyriazis
Keyword(s):  
Current Output ◽  
Transconductance Amplifier ◽  
Stable Current

TUNABLE WAVEFORM GENERATORS USING SINGLE DUAL-CURRENT OUTPUT OTAs

2008 ◽  
Vol 17 (06) ◽  
pp. 1193-1202 ◽  
Author(s):  
YU-KANG LO ◽  
HUNG-CHUN CHIEN ◽  
HUANG-JEN CHIU
Keyword(s):  
Pulse Width ◽  
Experimental Results ◽  
Pulse Waveform ◽  
Operational Transconductance Amplifier ◽  
Switching Element ◽  
Passive Components ◽  
Current Output ◽  
Transconductance Amplifier ◽  
Theoretical Analyses

Two novel electronic-tunable waveform generators using a single dual-current output operational transconductance amplifier (DO-OTA) with a few passive components are proposed in this paper. The first one can produce symmetrical square and triangular waveforms simultaneously. Based on the first topology, an additional N-MOS is adopted as a switching element to construct the second proposed circuit, which can generate a pulse waveform by a negative triggering signal. The repetitive frequency and pulse width of the presented circuits are adjustable by external passive components. Moreover, the output levels of the proposed circuits can be controlled by the DO-OTA's bias currents. These waveform generators feature more compact configurations compared to the existing designs. Experimental results are close to the theoretical analyses.

Alumina Nanofluids As Electrolytes Comparisons to Various Neutral Aqueous Solutions Inside Battery

2015 ◽  
Vol 32 (3) ◽  
pp. 369-379 ◽  
Author(s):  
R.-T. Wang ◽  
J.-C. Wang
Keyword(s):  
Thermal Conductivity ◽  
Aqueous Solutions ◽  
Mineral Water ◽  
Ph Value ◽  
Tap Water ◽  
Synthesis Process ◽  
Current Output ◽  
Ultrasonic Technology ◽  
Alumina Nanofluid ◽  
Stable Current

AbstractThis study investigated four electrolytes (tap water, mineral water, seawater, and Al2O3 nanoparticles emulsified in deionized water) to prepare nanofluids for enhancing their microgeneration and heattransfer capabilities by conducting thermoelectric performance experiments on power generation facilities. This study first performed a two-step synthesis process by using emulsion-ultrasonic technology for fabricating an Al2O3 nanofluid to determine the optimal suspended stability for the alumina nanofluid used as an electrolyte according to the Zeta potential, pH value, thermal conductivity, and viscosity. The alumina nanofluid was then compared with the other aqueous solutions to determine the characteristics of the effects of the output currents, voltages, resistances, and temperature distributions at different operating temperatures, distances, and electrode areas. Finally, the emulsifying effect of the alumina nanofluid between 0 wt % and 2 wt % demonstrated the most favorable stability, particle fraction, thermal conductivity, and stable current output.

Design and Characteristic Analysis on Servo Amplifier

2014 ◽  
Vol 926-930 ◽  
pp. 1235-1238
Author(s):  
Yun Dan Lu ◽  
Liang Cai Zeng ◽  
Fei Long Zheng ◽  
Gang Sheng Kai ◽  
Qiang Hua Xi
Keyword(s):  
Rapid Development ◽  
Simulation Software ◽  
Servo Control ◽  
Characteristic Analysis ◽  
Current Output ◽  
Servo Valve ◽  
Hydraulic Servo ◽  
Drive And Control ◽  
And Control ◽  
Stable Current

With the rapid development of the electro-hydraulic servo control technology, the application of electro-hydraulic servo valve has become more and more widely. Servo amplifier is an important part of the electro-hydraulic servo control system to drive and control servo valve. This essay introduces the principle and the function of servo-amplifier, and designs a servo amplifier with the functions of proportional amplifier, zero adjustment, feedback and current limitation. The performance analysis and validation for the servo amplifier are carried out by using simulation software EDA .On the basis of the simulation, the servo amplifier is fabricated, and its performance is tested. The results indicate that the servo amplifier has features of stable current output, good linearity, rapid response, and fully meet designing requirements.

scholarly journals Electronically Controllable Explicit Current Output Sinusoidal Oscillator Employing Single VDTA

2012 ◽  
Vol 2012 ◽  
pp. 1-5 ◽  
Author(s):  
Dinesh Prasad ◽  
D. R. Bhaskar
Keyword(s):  
Current Mode ◽  
Frequency Stability ◽  
Good Frequency ◽  
View Point ◽  
Current Output ◽  
Transconductance Amplifier ◽  
Sinusoidal Oscillator ◽  
Condition Of Oscillation ◽  
Ready Availability ◽  
Electronically Controllable

A new current-mode sinusoidal oscillator employing a single voltage differencing transconductance amplifier (VDTA), two grounded capacitors, and one grounded resistor has been proposed. The proposed sinusoidal oscillator offers the following advantageous features: (i) use of grounded capacitors which are attractive from the view point of IC implementation as well as eliminating/accommodating parasitic capacitances, (ii) independent control of frequency of oscillation and condition of oscillation, (iii) ready availability of explicit current-mode output, (iv) low active and passive sensitivities, and (v) a very good frequency stability. The workability of the proposed configuration has been established by PSPICE simulations.

Design of Wide Bandwidth, High-CMRR Voltage and Transadmittance-Mode Instrumentation Amplifier Using a Single CBTA

2019 ◽  
Vol 29 (04) ◽  
pp. 2050060
Author(s):  
Mehmet Sagbas ◽  
Umut Engin Ayten
Keyword(s):  
High Performance ◽  
Supply Voltage ◽  
High Gain ◽  
Instrumentation Amplifier ◽  
Cmos Process ◽  
Wide Bandwidth ◽  
Current Output ◽  
Transconductance Amplifier ◽  
Low Offset ◽  
Electronically Tunable

In this work, a high-performance voltage and current output instrumentation amplifier circuit is proposed. The proposed circuit also has voltage-mode (VM) and transadmittance-mode (TAM) outputs at a time. It employs a single current backward transconductance amplifier (CBTA) and a grounded resistor. It has the advantage of having low input and high output impedances which makes it easy for cascadability. The presented circuit has electronically tunable property due to the bias current of the CBTA. The validity of the proposed circuit is demonstrated by PSPICE simulations using a 0.18[Formula: see text][Formula: see text]m CMOS process with [Formula: see text][Formula: see text]V supply voltage. Simulation results show that the proposed circuit has a high common mode rejection ratio (CMRR), wide bandwidth, low offset and high gain properties.

ADRC Applied in Micro Grid of Wind Turbine with Flywheel

2012 ◽  
Vol 455-456 ◽  
pp. 211-216
Author(s):  
Yan Ning Zhang ◽  
Long Yun Kang ◽  
Bing Gang Cao ◽  
Jian Ming Xu
Keyword(s):  
Wind Turbine ◽  
Disturbance Rejection ◽  
Load Resistance ◽  
Object Model ◽  
Current Output ◽  
The Third ◽  
The Core ◽  
Additional State ◽  
Micro Grid ◽  
Stable Current

The auto-disturbance-rejection-controller (ADRC) is a new control theory that doesn’t need the exact object model. The variation of load resistance is observed and estimated by an extended state observer, which is the core of the ADRC. It is known to all that t-he output power of wind turbine is direct ration to the third power of wind speed; hence the flywheel is introduced to keep the stable current output. The system is composed by the permanent magnetism synchronized generator wind turbine and the permanent magnetism synchronized generator flywheel. The control system is nonlinear, the nonlinear parts of the system can be considered as the disturbance which is estimated by an additional state. The Matlab simulink software and lab system have been carried out and the results confirm the robustness of the ADRC.

A Stable Field Emission Electron Source

1977 ◽  
Vol 35 ◽  
pp. 58-59
Author(s):  
W.R. Bottoms ◽  
G.B. Haydon
Keyword(s):  
Field Emission ◽  
Signal To Noise Ratio ◽  
High Brightness ◽  
Electron Sources ◽  
Brightness Field ◽  
Current Densities ◽  
Properties Of Materials ◽  
Stable Field ◽  
Stable Current ◽  
Careful Design

There is great interest in improving the brightness of electron sources and therefore the ability of electron optical instrumentation to probe the properties of materials. Extensive work by Dr. Crew and others has provided extremely high brightness sources for certain kinds of analytical problems but which pose serious difficulties in other problems. These sources cannot survive in conventional system vacuums. If one wishes to gather information from the other signal channels activated by electron beam bombardment it is necessary to provide sufficient current to allow an acceptable signal-to-noise ratio. It is possible through careful design to provide a high brightness field emission source which has the capability of providing high currents as well as high current densities to a specimen. In this paper we describe an electrode to provide long-lived stable current in field emission sources.The source geometry was based upon the results of extensive computer modeling. The design attempted to maximize the total current available at a specimen.

scholarly journals Wind driven semiconductor electricity generator with high direct current output based on a dynamic Schottky junction

RSC Advances ◽  
2021 ◽  
Vol 11 (31) ◽  
pp. 19106-19112
Author(s):  
Xutao Yu ◽  
Haonan Zheng ◽  
Yanghua Lu ◽  
Runjiang Shen ◽  
Yanfei Yan ◽  
...  
Keyword(s):  
Wind Energy ◽  
Direct Current ◽  
Schottky Junction ◽  
Current Output

In this study, a generator based on a metal/semiconductor dynamic Schottky junction has achieved ultrahigh and continuous direct current output by harvesting wind energy.

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