Improving power efficiency of a two-stage operational amplifier for biomedical applications

2015 ◽  
Vol 84 (2) ◽  
pp. 173-183 ◽  
Author(s):  
Meysam Akbari ◽  
Masoud Nazari ◽  
Leila Sharifi ◽  
Omid Hashemipour
Keyword(s):  
Operational Amplifier ◽  
Power Efficiency ◽  
Biomedical Applications ◽  
Two Stage

scholarly journals Analysis and control of micro-stepping characteristics of ultrasonic motor

2020 ◽  
Vol 15 (4) ◽  
pp. 585-599
Author(s):  
Ning Chen ◽  
Jieji Zheng ◽  
Xianliang Jiang ◽  
Shixun Fan ◽  
Dapeng Fan
Keyword(s):  
Biomedical Applications ◽  
Pulse Number ◽  
Open Loop ◽  
Two Stage ◽  
Compact Structure ◽  
Ultrasonic Motors ◽  
Output Torque ◽  
Field Programmable ◽  
Positioning Device ◽  
And Control

AbstractMicro-stepping motion of ultrasonic motors satisfies biomedical applications, such as cell operation and nuclear magnetic resonance, which require a precise compact-structure non-magnetization positioning device. When the pulse number is relatively small, the stopping characteristics have a non-negligible effect on the entire stepwise process. However, few studies have been conducted to show the rule of the open-loop stepwise motion, especially the shutdown stage. In this study, the modal differences of the shutdown stage are found connected with amplitude and velocity at the turn-off instant. Changes of the length in the contact area and driving zone as well as the input currents, vibration states, output torque, and axial pressure are derived by a simulation model to further explore the rules. The speed curves and vibration results in functions of different pulse numbers are compared, and the stepwise motion can be described by a two-stage two-order transfer function. A test workbench based on the Field Programmable Gate Array is built for acquiring the speed, currents, and feedback voltages of the startup-shutdown stage accurately with the help of its excellent synchronization performances. Therefore, stator vibration, rotor velocity, and terminal displacements under different pulse numbers can be compared. Moreover, the two-stage two-order model is identified on the stepwise speed curves, and the fitness over 85% between the simulation and test verifies the model availability. Finally, with the optimization of the pulse number, the motor achieves 3.3 µrad in clockwise and counterclockwise direction.

scholarly journals Design of CMOS Two-stage Operational Amplifier for ECG Monitoring System Using 90nm Technology

2014 ◽  
Vol 6 (5) ◽  
pp. 55-66 ◽  
Author(s):  
Fateh Moulahcene ◽  
Nour-Eddine Bouguechal ◽  
Imad Benacer ◽  
Saleh Hanfoug
Keyword(s):  
Monitoring System ◽  
Operational Amplifier ◽  
Ecg Monitoring ◽  
Two Stage

Two Stage Operational Amplifier with a Gain Boosted, Source Follower Buffer

2016 ◽  
Vol 34 (6) ◽  
pp. 256-259 ◽  
Author(s):  
S. Srinivas Rahul ◽  
◽  
P. Naga Tejaswi ◽  
Y. Mohan Sandeep ◽  
K. Hari Krishna
Keyword(s):  
Operational Amplifier ◽  
Two Stage ◽  
Source Follower

scholarly journals Design Procedures for a Fully Differential Telescopic Cascode Two-Stage CMOS Operational Amplifier

2012 ◽  
Vol 29 ◽  
pp. 4030-4034 ◽  
Author(s):  
M.Y. Ren ◽  
T. Wu ◽  
M.X. Song ◽  
C.X. Zhang
Keyword(s):  
Operational Amplifier ◽  
Two Stage ◽  
Design Procedures ◽  
Fully Differential
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