scholarly journals Voltage-Mode Four-Phase Sinusoidal Generator and Its Useful Extensions

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Sudhanshu Maheshwari
Keyword(s):  
High Frequency ◽  
Second Order ◽  
Voltage Mode ◽  
Active Elements ◽  
Generator Circuit ◽  
Condition Of Oscillation ◽  
Simulation Results ◽  
Parasitic Effects

This paper introduces a new voltage-mode second-order sinusoidal generator circuit with four active elements and six passive elements, including grounded capacitors. The frequency and condition of oscillation can be independently controlled. The effect of active element’s nonidealities and parasitic effects is also studied; the proposed topology is good in absorbing several parasitic elements involved with the active elements. The circuit is advantageous for generating high frequency signals which is demonstrated for 25 MHz outputs. Several circuit extensions are also given which makes the new proposal useful for real circuit adoption. The proposed theory is validated through simulation results.

NEW REALIZATIONS OF VOLTAGE-MODE QUADRATURE OSCILLATORS USING CURRENT DIFFERENCING BUFFERED AMPLIFIERS

2010 ◽  
Vol 19 (05) ◽  
pp. 1069-1076 ◽  
Author(s):  
ABHIRUP LAHIRI
Keyword(s):  
Point Of View ◽  
Passive Components ◽  
Voltage Mode ◽  
Sinusoidal Oscillators ◽  
Integration Point ◽  
Condition Of Oscillation ◽  
Simulation Results ◽  
Quadrature Oscillators

A number of sinusoidal oscillators using current differencing buffered amplifiers (CDBAs) have been reported in the literature. However, only three of them are canonic quadrature oscillators (i.e., requiring two capacitors). The aim of this letter is to present additional realizations of single/dual-resistance-controlled quadrature oscillators using CDBAs. Four voltage-mode quadrature oscillators are proposed, which provide the following advantageous features: (i) use of reduced and canonic component count, viz. two CDBAs, three/four resistors and two capacitors, (ii) all passive components are grounded or virtually grounded, which is favorable from integration point of view and (iii) independent and non-interactive resistor control of the condition of oscillation (CO) and the frequency of oscillation (FO). Simulation results verifying the workability of the proposed circuits have been included.

scholarly journals High-Frequency Sections of Active Filters of Mixed-Signal SoC Based on Current Amplifiers

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Sergei Krutchinsky ◽  
Nikolai Prokopenko
Keyword(s):  
High Frequency ◽  
Sufficient Conditions ◽  
Basic Structure ◽  
Second Order ◽  
Active Filters ◽  
Order Unit ◽  
Mixed Signal ◽  
Active Elements

The sufficient conditions for the efficient use of active elements are formulated by analyzing the basic structure of second-order unit. The expediency of current amplifiers usage in HF and SHF filters is shown. The examples of a methodical nature are given and conclusions of application importance are formulated.

scholarly journals Condition of phase angle for a new VDGA-based multiphase variable phase shift oscillator from 0o to 90o

2020 ◽  
Vol 10 (4) ◽  
pp. 3801
Author(s):  
Kasim K. Abdalla
Keyword(s):  
Phase Angle ◽  
Harmonic Distortion ◽  
Cmos Technology ◽  
Electronic Control ◽  
Variable Phase ◽  
Voltage Mode ◽  
Condition Of Oscillation ◽  
Simulation Results ◽  
First Time ◽  
Modern Building

A novel interesting type of variable phase angle voltage mode oscillator using modern building block has been presented in this paper. The new proposed oscillator configuration which uses four voltage differencing gain amplifier (VDGA) and two grounded capacitors can generate two sinusoidal signals that change out of phase by 0 to 90 degree. It has four floating and explicit voltage mode outputs where every two outputs have the same phase. The circuit is characterized by (i) the condition of phase angle of the oscillation (PO) (this concept is introduced for the first time in this paper) can be tuned electronically (ii) the gain of the floating outputs can be controlled independently (iii) it provides electronic control of condition of oscillation (CO) and independent control of frequency of oscillation (FO). The Total Harmonic Distortion (THD) of the output waveforms was obtained and the results were reasonability values (less than 4.5%). The non-ideal analysis and simulation results are investigated and confirmed the theoretical analysis based upon VDGAs implementable in 0.35μm CMOS technology. Simulation results include time response and frequency response outputs generated by using the PSPICE program.

scholarly journals On The Realization of Low/High Frequency CCII+ Based Oscillators Employing Grounded Resistors and Lossy Capacitors

1995 ◽  
Vol 17 (4) ◽  
pp. 269-274 ◽  
Author(s):  
Muhammad Taher Abuelma'atti ◽  
Muhammad Haroon Khan
Keyword(s):  
High Frequency ◽  
Second Generation ◽  
Current Conveyors ◽  
Independent Control ◽  
Low Frequencies ◽  
Positive Current ◽  
Condition Of Oscillation ◽  
Simulation Results ◽  
Oscillator Circuits

New RC oscillator circuits are presented. Each circuit uses two second-generation positive current-conveyors, three grounded capacitors and four grounded resistors. The circuits enjoy independent control of the frequency and the condition of oscillation and are very attractive for integration. The circuits can realize high and low frequencies of oscillation. Simulation results are included.

scholarly journals Sinusoidal Generator withπ/4-Shifted Four/Eight Voltage Outputs Employing Four Grounded Components and Two/Six Active Elements

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Sudhanshu Maheshwari
Keyword(s):  
Sine Wave ◽  
Wave Generation ◽  
Interesting Application ◽  
Active Elements ◽  
Circuit Structure ◽  
Simulation Results ◽  
Parasitic Effects ◽  
Output Stages ◽  
Good Agreement

This paper presents a new circuit proposal for multiphase sine-wave generation, employing two active elements and four grounded passive elements. The proposed oscillator provides four 45° phase-shifted voltage outputs. Incorporation of additional inverters for generation of eight-phase outputs is further shown. Simultaneous current outputs can also be generated with additional output stages. The compact circuit structure is studied for nonideal and parasitic effects and simulation results are given, which are in good agreement with the theory. The utility of the proposal forπ/4-QPSK generation is explored as an interesting application example with supporting results.

Voltage Mode Second Order Notch/All - Pass Filter Realization Using OTRA

2016 ◽  
Vol 6 (2) ◽  
pp. 22
Author(s):  
ANURAG RASHIKA ◽  
PANDEY NEETA ◽  
CHANDRA ROHAN ◽  
PANDEY RAJESHWARI ◽  
◽  
...  
Keyword(s):  
Second Order ◽  
Pass Filter ◽  
Voltage Mode

scholarly journals Zero Watermarking Algorithm for Vector Geographic Data Based on the Number of Neighboring Features

Symmetry ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 208
Author(s):  
Qifei Zhou ◽  
Changqing Zhu ◽  
Na Ren ◽  
Weitong Chen ◽  
Weiteng Gong
Keyword(s):  
Copyright Protection ◽  
Second Order ◽  
Superior Performance ◽  
Statistical Characteristics ◽  
First Order ◽  
Geographic Data ◽  
Simulation Results ◽  
Topological Characteristics ◽  
Zero Watermarking ◽  
Critical Challenge

Zero watermarking is an important part of copyright protection of vector geographic data. However, how to improve the robustness of zero watermarking is still a critical challenge, especially in resisting attacks with significant distortion. We proposed a zero watermarking method for vector geographic data based on the number of neighboring features. The method makes full use of spatial characteristics of vector geographic data, including topological characteristics and statistical characteristics. First, the number of first-order neighboring features (NFNF) and the number of second-order neighboring features (NSNF) of every feature in vector geographic data are counted. Then, the watermark bit is determined by the NFNF value, and the watermark index is determined by the NSNF value. Finally, combine the watermark bits and the watermark indices to construct a watermark. Experiments verify the theoretical achievements and good robustness of this method. Simulation results also demonstrate that the normalized coefficient of the method is always kept at 1.00 under the attacks that distort data significantly, which has the superior performance in comparison to other methods.

A Numerical Simulation of Non-Linear Air-Gap for Deepwater Semi-Submersible Platform

2021 ◽  
Author(s):  
Zhuang Kang ◽  
Yansong Zhang ◽  
Haibo Sui ◽  
Rui Chang
Keyword(s):  
Air Gap ◽  
Second Order ◽  
Difference Frequency ◽  
Hydrodynamic Performance ◽  
Wave Loads ◽  
Order Difference ◽  
Motion Response ◽  
Nonlinear Motion ◽  
Non Linear ◽  
Simulation Results

Abstract Air gap is pivotal to the hydrodynamic performance for the semi-submersible platform as a key characteristic for the strength assessment and safety evaluation. Considering the metocean conditions of the Norse Sea, the hydrodynamic performance of a semi-submersible platform has been analyzed. Based on the three-dimensional potential flow theory, and combined with the full QTF matrix and the second-order difference frequency loads, the nonlinear motion characteristics and the prediction for air gap have been simulated. The wave frequency motion response, the second-order nonlinear air gap response and nonlinear motion response of the platform have been analyzed. By comparing the simulation results, the air gap response of the platform considering the nonlinear motion is more intense than the results simulated by the first-order motion without considering the second-order difference frequency loads. Under the heavy metocean conditions, for the heave and pitch motion of the platform, the non-linear simulation values for some air gap points and areas are negative which means the wave slam has been occurred, but the calculation results of linear motion response indicate that the air gap above has not appeared the wave slamming areas. The simulation results present that the influence of the second-order wave loads is a critical part in the air gap prediction for the semi-submersible platform.

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