scholarly journals New Synchronization Method for Transmission Systems with Variable Length of Bits

2015 ◽  
Vol 61 (1) ◽  
pp. 31-36 ◽  
Author(s):  
Juliusz Godek ◽  
Ryszard Golański ◽  
Jacek Kołodziej ◽  
Jacek Stępień
Keyword(s):  
Input Signal ◽  
Sampling Rate ◽  
Rate Adaptation ◽  
Rate Of Change ◽  
Variable Length ◽  
Transmission Systems ◽  
Synchronization Method ◽  
Signal Rate ◽  
Variable Duration ◽  
Evaluation Module

Abstract Based on the Spartan 3E evaluation module, a flexible platform for the implementation of different algorithms for A/D conversion was developed. The aim of presented work was to improve the concept of the sampling rate adaptation to the input signal rate of change in terms of practical issues including synchronization of delta codecs. The new, original synchronization method, useful in systems dedicated for transmission of variable duration of bits was proposed and experimentally verified. Performed measures and observations have shown elimination of the synchronization lose phenomenon

scholarly journals Functional Capabilities of Coupled Memristor-Based Reactance-Less Oscillators

2021 ◽  
Author(s):  
Vladimir V. Rakitin ◽  
Sergey G. Rusakov
Keyword(s):  
Input Signal ◽  
Pulse Sequences ◽  
Main Idea ◽  
Rate Of Change ◽  
Simple Circuit ◽  
Digital Signals ◽  
Oscillator Circuit ◽  
Control Approach ◽  
Functional Capabilities ◽  
Memristor Device

New functionalities of reactance-less memristor based oscillators are discussed which arise when two elementary oscillators are connected. It is shown that the system of coupled memristor based oscillators can be used for converting analog and analog-digital signals into binary pulse sequences. The approach to control the thresholds in memristor based oscillators is discussed. Standard control approach in memristor based oscillators is the exploitation of input signal to drive the rate of change in the state of the memristor. In contrast, the main idea of the considered controlling approach is to send the input signal not directly to the memristor device but to the comparator circuit and as result to control oscillator circuit behavior by change of interval of memristor resistor variation. The capabilities of coupled memristor based oscillators with control thresholds are sufficient for constructing the simple circuit elements of oscillatory computing architectures.

A Simple and Efficient Charge Injection Error Compensation Structure for MOS Sampling Switches

2018 ◽  
Vol 27 (08) ◽  
pp. 1850130 ◽  
Author(s):  
Saeed Naghavi ◽  
Mojde Nematzade ◽  
Niloofar Sharifi ◽  
Tohid Moradi Khanshan ◽  
Adib Abrishamifar ◽  
...  
Keyword(s):  
Input Signal ◽  
Dynamic Range ◽  
Supply Voltage ◽  
Sampling Rate ◽  
Charge Injection ◽  
Sampled Data ◽  
Sampling Errors ◽  
Wide Range ◽  
Sinusoidal Input ◽  
Simulation Results

This paper introduces a new technique to design an analog MOS switch to be used in sampled-data circuits. In any sampled-data system, the accuracy of the sampling switch is a critical parameter to determine the overall performance of the system. To satisfy accuracy requirements of the switch, a novel technique to reduce channel charge injection error is proposed. The proposed switch has a very simple structure and it uses a small area of the chip. Also, it has a low on-resistance and its variation over the input signal range is acceptable. In order to evaluate the performance of the proposed switch, simulations are done in a 0.18[Formula: see text][Formula: see text]m standard CMOS technology. Simulation results show that the sampling errors produced by the channel charge injection is eliminated through a cancellation technique using an auxiliary transistor. The output error charge due to charge injection over a wide range of the input signal variation is very low (less than 1.45[Formula: see text]fC). Also, simulation results show that the proposed switch achieves signal-to-noise plus distortion ratio (SNDR) of 85.05[Formula: see text]dB, effective number of bits (ENOB) of 13.83, total harmonic distortion (THD) of [Formula: see text]87.23[Formula: see text]dB and spurious-free dynamic range (SFDR) of 88.14[Formula: see text]dB for a 1[Formula: see text]MHz sinusoidal input of 800[Formula: see text]mV peak-to-peak amplitude at 50[Formula: see text]MHz sampling rate with a 1.8[Formula: see text]V supply voltage.

Forced response of translating media with variable length and tension: Application to high-speed elevators

2005 ◽  
Vol 219 (1) ◽  
pp. 35-53 ◽  
Author(s):  
W D Zhu ◽  
Y Chen
Keyword(s):  
High Speed ◽  
Initial Conditions ◽  
Control Volume ◽  
String Model ◽  
Forced Response ◽  
Rate Of Change ◽  
Variable Length ◽  
Lateral Response ◽  
Discretization Schemes ◽  
Fixed Boundaries

The lateral response of vertically translating media with variable length and tension, subjected to general initial conditions and external excitation, are determined. The translating media are modelled as a taut string and tensioned beams with pinned and fixed boundaries. In each model a rigid body is attached to the lower end of the medium and has a prescribed displacement along the horizontal direction. The rate of change in the energy of the translating medium is analysed from the control volume and system viewpoints. The models are used to predict the forced response of a moving cable in a high-speed elevator. Three spatial discretization schemes are used to calculate the response and shown to yield the same results. The convergence of the solution for each model is investigated. The approximate solution for the string model with constant tension is compared with its exact solution from the wave method.

The Research of the Jam Fault Features and Diagnostic Methods of the Slide Valve Oil Motive Based on DEH Data

2013 ◽  
Vol 860-863 ◽  
pp. 1791-1795
Author(s):  
Yong Xin Feng ◽  
Sun Cai ◽  
Chong Ming Song ◽  
Si Jia Wei ◽  
Jin Fu Liu ◽  
...  
Keyword(s):  
Fault Diagnosis ◽  
Steam Turbine ◽  
Input Signal ◽  
Slide Valve ◽  
Rate Of Change ◽  
Diagnostic Methods ◽  
Stable Operation ◽  
Limited Data ◽  
Fault Features ◽  
The Relationship

The jam fault diagnosis of slide valve oil motive has great significance on the safe and stable operation of steam turbine. As limited data available from DEH, the jam fault is difficultly diagnosed directly by DEH data. This paper defines insensitivity to represent the level of the jam fault of slide valve oil motive system. Through the simulation and research of the jam fault features of the slide valve oil motive, the relationship between the rate of change of the input signal and the insensitivity of the jam fault diagnosis is be found . Then jam fault diagnosis strategy based on DEH data was put forward and it shows good results with verification by the actual data.

Forced Response of Translating Media With Variable Length and Tension: Application to High-Speed Elevators

2004 ◽  
Author(s):  
W. D. Zhu ◽  
Y. Chen
Keyword(s):  
High Speed ◽  
Initial Conditions ◽  
Control Volume ◽  
String Model ◽  
Forced Response ◽  
Rate Of Change ◽  
Variable Length ◽  
Lateral Response ◽  
Discretization Schemes ◽  
Fixed Boundaries

The lateral response of vertically translating media with variable length and tension, subjected to general initial conditions and external excitation, are determined. The translating media are modeled as a taut string and tensioned beams with pinned and fixed boundaries. In each model a rigid body is attached to the lower end of the medium and has a prescribed displacement along the horizontal direction. The rate of change of the energy of the translating medium is analyzed from the control volume and system viewpoints. The models are used to predict the forced response of a moving cable in a high-speed elevator. Three spatial discretization schemes are used to calculate the response and shown to yield the same results. The convergence of the solution for each model is investigated. The approximate solution for the string model with constant tension is compared with its exact solution from the wave method.

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