In order to get current-mode multiphase sinusoidal oscillator with high frequency, high accuracy, high stability and easy to be integrated, a multiphase sinusoidal oscillator circuit is presented. The oscillator can produce N output-currents (N being even or odd) with equal-amplitude and equal- phase spaced. The circuit uses adjoint Op-Amp, grounded capacitors and enjoys low passive sensitivities. The oscillation condition and frequency for the oscillator can be tuned independently. The simulated results are illustrated.
A kind of 5Nm prototype LABLTM (Limited-Angle Brushless Torque Motor) is presented and designed. The basic structure of the motor is deliberated. The method of calculating the electromagnetic torque is provided. The Magnet software is used to optimize some important parameters of the motor. The prototype is fabricated. The test results of the prototype indicate that the LABLTM, with high torque and high reliability, does meet the requirements of direct drive actuator of precision welding equipment. It has a promising future in automatic control, electrical drive, etc.
A systematic synthesis approach for floating gyrators employing single z-copy current-controlled current conveyor trans-conductance amplifier (CCCCTA) is presented in this work. Initially, the pathological models of two types of the CCCCTA, namely z-copy z +-output CCCCTA (CCCCTA+) and z-copy z −-output CCCCTA (z-copy CCCCTA−), are derived by virtue of the nodal admittance matrix (NAM) expansion method. Moreover, these models are then used in the synthesis of floating gyrator using single z-copy CCCCTA. Two floating gyrators are acquired by expanding the NAM of floating gyrator. The synthesised gyrators employ one z-copy CCCCTA and a grounded admittance. Adjusting bias currents of the CCCCTA can tune the parameter of the gyrators. The hand analysis and PSPICE simulation show that the used synthesis method is simple, systematic and valid.
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