A 2.4-8 GHz Phase Rotator Delay-Locked Loop Using Cascading Structure for Direct Input-Output Phase Detection

Author(s):  
Hyunsu Park ◽  
Jincheol Sim ◽  
Yoonjae Choi ◽  
Jonghyuck Choi ◽  
Youngwook Kwon ◽  
...  
2021 ◽  
Vol 92 (8) ◽  
pp. 083501
Author(s):  
Y. Nozawa ◽  
M. Uchida ◽  
H. Igami ◽  
R. Kajita ◽  
H. Tanaka ◽  
...  

2021 ◽  
Vol 2131 (3) ◽  
pp. 032021
Author(s):  
A Voevoda ◽  
V Shipagin ◽  
K Bobobekov

Abstract Modification of the algorithm for the polynomial synthesis of a multi-channel controller was proposed to preserve all control channels in this article. In order to test the functionality of the proposed modification, an example of a linear model of an unstable multi-channel plant is considered. The choice of the plant was determined by the possibility of a visual algorithm demonstration for polynomial synthesis of the controller, taking into account the proposed modifications.The plant was represented as three series-connected standard links: an aperiodic link of the first order, an unstable link, and an integrator, and has three input and two output channels. The control in the system is carried out in the feedback of the system and is summed up with the input impact. The feature of the plant is to limit the task to the second output, since it is essentially a derivative of the first output. In addition, the plant has a direct input–output channel. That is, the traversal matrix of the system is nonzero (when described through the state space). The synthesis task was set as follows: it is necessary to achieve certain quality indicators of the output vector value while maintaining all three control channels of the plant.


2005 ◽  
Vol 2005 (3) ◽  
pp. 373-378 ◽  
Author(s):  
M. de la Sen ◽  
A. Bilbao-Guillerna

The appropriate use of fractional-order holds (β-FROH) of correcting gainsβ∈[−1,1]as an alternative to the classical zero-and first-order holds (ZOHs, FOHs) is discussed related to the positive realness of the associate discrete transfer functions obtained from a given continuous transfer function. It is proved that the minimum direct input/output gain (i.e., the quotient of the leading coefficients of the numerator and denominator of the transfer function) needed for discrete positive realness may be reduced by the choice ofβcompared to that required for discretization via ZOH.


2021 ◽  
Vol 9 (1) ◽  
pp. 26-38
Author(s):  
Odeh A.O ◽  
Okpaire L.A ◽  
Oyedoh E.A

Oxy-fuel Combustion is a technology with the potential of drastically reducing the amount of CO2 emission, it relies on the use of oxygen and recycled CO2 instead of air as the oxidant. This helps to reduce the amount of the CO2 and NOx emissions. This study focuses on the components of flue gas produced and their amounts for oxy-fuel combustion in a coal-fired power plant (CFPP) and also the boiler efficiency using the direct (input-output) method. The combustion process of pulverized coal in a 120MW power plant is studied using Aspen Plus 11. The amount of each component in flue gas in coal-fired processes with air or O2/ CO2 (using recycle of 20%, 40%, 60% and 80% of CO2) as oxidizer was obtained. From the process simulation, as the recycle % of CO2 was increased, the flame temperature, CO and NOx emissions were reduced. The simulation results of air combustion were compared with that of oxy-fuel combustion with 80% recycle and it was seen that the flame temperature dropped from 1894oC when air was used as oxidizer to 1679oC for oxy-fuel combustion with 80% recycle. Also, there was a reduction in the amount of NOx produced, but the SOx levels were constant for both combustion processes. The Gross Calorific Value (GCV) of the coal was calculated from its Proximate Analysis using Dulong’s formula and it was used to estimate the Boiler Efficiency using the Direct (Input-Output) method and a value of 83.6% was obtained.


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