A fifth-order polynomial predistortion circuit for Mach-Zehnder modulator linearization in 65nm CMOS

Author(s):  
Jeffrey Okyere ◽  
Kunzhi Yu ◽  
Kamran Entesari ◽  
Samuel Palermo
AIAA Journal ◽  
2018 ◽  
Vol 56 (6) ◽  
pp. 2509-2513 ◽  
Author(s):  
Joel Storch ◽  
Isaac Elishakoff

Author(s):  
Nathan L. Cook ◽  
Wayne J. Book

A real-time optimization routine is presented. The routine calculates the “best” coefficients of a fifth-order polynomial trajectory. The trajectory is used to calculate the setpoints given to a servomotor every ten milliseconds to drive a patented hypotrochoidal gear mechanism as part of an industrial food packaging machine (Howard et al, 2000). It is desired to minimize the upward, vertical forces that the gear mechanism exerts on the machine. The optimization routine is shown in simulation to result in a trajectory that can reduce the upward force by 30–40%, without sacrificing the production rate, by explicitly taking into account the hypotrochoidal kinematics of the gear mechanism.


Author(s):  
Qian Lin ◽  
Hai-Feng Wu ◽  
Lin-Sheng Liu ◽  
Chun Cao

This paper discusses the impact of the adjacent channels on the 1-dB compression point, the IP3 and the IP5 of Radio Frequency (RF) amplifier by n-tone test. By combining the theoretical derivation and software simulation, the model analysis for the third/five order polynomial nonlinear amplifier has been achieved. Moreover, the control variable method is adopted to draw the curves for the input/output signals. The research shows that the 1-dB compression point, the IP3 and the IP5 drop as n increases, and they all have symmetry for a given n. The fifth-order polynomial nonlinear amplifier model is proposed, the research shows that the adjacent channels have a great impact on the 1-dB compression point, the IP3 and the IP5 of the desired channel. This effect must be taken into account in actual RF amplifier designs and wireless communication architectures.


2012 ◽  
Vol 232 ◽  
pp. 648-656 ◽  
Author(s):  
Atef A. Ata ◽  
Eman H. Haraz ◽  
A. Elfattah A. Rizk ◽  
Sarwat N. Hanna

The applications of flexible manipulators are increasing and due to the high demand on fuel consumption there is a need to optimize the energy consumption for stable and durable operation of the flexible manipulators. In the present work the Genetic Algorithm (GA) is employed to optimize the total torque and the torque of the first link of a two-link flexible manipulator with a fourth order polynomial trajectory. The mathematical model of the manipulator is obtained using the extended Hamilton's Principle where the flexible links are treated as Euler- Bernoulli's beam theory. A fifth order polynomial trajectory undergoes a rest-to rest maneuvering is proposed as a bench mark for validation.


2021 ◽  
Author(s):  
Gustavo Decol ◽  
Alejandro Ramirez

Several sectors, and especially the industrial environment, havebecome increasingly automated. Their processes end up need moresophisticated applications and, through a feedback control system,they seek to obtain a better performance, as in the case of servomechanisms.In addition, in certain applications, it is necessary to generate movements to provide a desired behavior in the mechanical axis, simplifying the operation of the controller. In this sense, trajectory generating algorithms assist in the configuration and implementation of the position, speed and acceleration profilewith unique characteristics for each situation. Considering the relevance of this theme, this work describes the development of a trajectory generating module, responsible for the generation of the movements of a servomechanism. The trajectory generation algorithms, known as cubic polynomial, fifth order polynomial and trapezoidal, were studied and implemented. A hardware based on the Arduino Mega, a power driver and a servomotor, was designedto validate these algorithms. The position, speed and acceleration profiles generated for a one axis servosystem and the feedback obtained by an encoder, allowed to validate the proposed strategy. It is hoped that the designed platform would become an important resource in a discipline of Robotics.


2015 ◽  
Vol 2015 ◽  
pp. 1-9
Author(s):  
Zuoxun Wang ◽  
Zhiguo Yan

In order to ensure the steady ability of the LED wafer transporting robot, a high order polynomial interpolation method is proposed to plan the motion process of the LED wafer transporting robot. According to the LED wafer transporting robot which is fast and has no vibration, fifth-order polynomial is applied to complete the robot’s motion planning. A new subsection search method is proposed to optimize the transporting robot’s acceleration. Optimal planning curve is achieved by the subsection searching. Extended Kalman filter algorithm and PID algorithm are employed to follow the tracks of planned path. MATLAB simulation and experiment confirm the validity and efficiency of the proposed method.


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