A quadrature sinusoidal oscillator with phase-preserving linear frequency control and independent static amplitude control

2006 ◽  
Author(s):  
D.N. Loizos ◽  
P.P. Sotiriadis
Keyword(s):  
Frequency Control ◽  
Amplitude Control ◽  
Linear Frequency ◽  
Sinusoidal Oscillator

scholarly journals Partially Active-R Grounded-Capacitor CFOA-Based Sinusoidal Oscillators

1996 ◽  
Vol 19 (2) ◽  
pp. 105-109 ◽  
Author(s):  
Muhammad Taher Abuelma'atti ◽  
Muhammad Haroon Khan
Keyword(s):  
Frequency Control ◽  
Experimental Results ◽  
Sinusoidal Oscillators ◽  
Sinusoidal Oscillator ◽  
Oscillator Circuits

New grounded-capacitor CFOA-based sinusoidal oscillator circuits with independent frequency control are presented. Experimental results are included.

scholarly journals Two Phase Motor under Control

2019 ◽  
Vol 8 (3) ◽  
pp. 4218-4221
Keyword(s):  
Single Phase ◽  
Frequency Control ◽  
Phase Control ◽  
Voltage Source ◽  
Control Voltage ◽  
Two Phase ◽  
Machine Material ◽  
Amplitude Control ◽  
Nominal Voltage ◽  
Starting Torque

The use of symmetrical two-phase stator windings with time phase control, (leaving the phase voltages eqal in magnitudes), leads to better utilization of machine material. This aidea can be extended to include many methods of control such as amplitude control, time-phase control, frequency control, voltage control and voltage-frequency control methods. If any of these methods is used, either Vc, , f and/or Vr may be varied with the control signal. For these sugested methods, the reference voltage Vr, changes w.r.t nominal voltage Vrn, the frequency changes w.r.t the nominal frequency fn, the control voltage Vc, changes w.r.t nominal voltage Vrn and the time phase angle  decreases than 90o, respectively. In this paper, the operation of 2-phase motor from single-phase supply is carried out by connecting one stator phase directly to the voltage source, and exciting the second stator phase through a phase shifting element.Compared to single-phase operation, good performance characteristics with higher starting torque are achieved. It is necessary to start the analysis by using the known equivalent circuits of both forward and backward components to obtain the relations between the sequence parameters and the phase values. In this method of control, starting torque and maximum torque values are controlled by changing the stator field from a pulsating field at zero degree to a pure rotating field which must be achieved at 90o electrical degrees

scholarly journals Electronically Tunable Quadrature Oscillator Using Translinear Conveyors and Grounded Capacitors

2003 ◽  
Vol 26 (3) ◽  
pp. 193-196 ◽  
Author(s):  
Sudhanshu Maheshwari
Keyword(s):  
Frequency Control ◽  
Current Mode ◽  
Current Control ◽  
External Current ◽  
Quadrature Oscillator ◽  
Sinusoidal Oscillator ◽  
Wide Range ◽  
Simulation Results ◽  
Electronically Tunable

A new electronically tunable current-mode sinusoidal oscillator with three quadrature outputs is presented. The proposed circuit employs three translinear conveyors and two grounded capacitors to realize three quadrature outputs with independent frequency control. The circuit requires no resistors and the frequency of the oscillator can be varied over a wide range by external current control. RSPICE simulation results using the bipolar implementation of translinear conveyors are given to support the proposed circuit.

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