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A new four-phase quadrature oscillator using single DO-CFTA with current control

Saetiaw C., Summart S.

Przegląd Elektrotechniczny

2018

R. 94, nr 7

12--16

This article presents a four-phase current-mode quadrature oscillator based on dual current follower transconductance amplifier (DOCFTA). It uses single DO-CFTA and two grounded capacitors without additional external resistors. In addition, the condition and frequency of oscillation can be adjusted by electronic method by adjusting the bias currents of the DO-CFTA. It has high output impedance appropriate for cascade connection in current mode technique. Moreover, the oscillator uses only grounded capacitors, it is considerably appropriate for further developing into an integrated circuit. The results of PSPICE simulation program are corresponding to the theoretical analysis.

WQ artykule opisano czterofazowy generator wykorzystujący trankonduktancyjny wzmacniacz DO-CFTA. Układ wykrzystuje pojedynczy wzmacniacz i dwa uziemione kondensatory bez zewnetrznych rezystorów. Generator może być strojony przez prąd pomocniczy wzmacniacza. Symulacje w programie PSPICE potwierdziły teoretyczne założenia.

Mathematical model of gas-liquid-sand mixture separation in the four-phase separator of inertial type for subsea application

Kopey B. V., Kryvonozhko T. A., Liakh M. M., Yuriev E. V.

AGH Drilling, Oil, Gas

2016

Vol. 33, no. 2

361--377

In this article the construction and mathematical model of four-phase separator is realized, which is based on inertial separation mechanism of gas-liquid-sand mixture. Also we have put the problem on the basis of this model to obtain the dependence of separator efficiency on the parameters which play a crucial role in the technological process of separating gas-oil-water-sand mixture into a solid, liquid and a gas phase.