Czasopismo | PRZEGLĄD ELEKTROTECHNICZNY | Rocznik 2016 - zeszyt 2

Second Order Current-mode Quadrature Oscillators Using OTAs

10.15199/48.2016.02.43

nr katalogowy: 96943
10.15199/48.2016.02.43

This article presents new current-mode quadrature oscillator circuits using OTA which are designed from block diagram. The proposed circuits consist of three OTAs and two grounded capacitors. The circuits have high output impedance appropriate for cascade connection application in current mode technique which is capable to directly drive load. The oscillators use only grounded capacitor which is very appropriate for further development into an integrated circuit. In addition, the condition of oscillation can be adjusted orthogonally from the frequency of oscillation. The results of PSPICE simulation program are corresponding to the theoretical analysis. Streszczenie. W artykule opisano nowy prądowy generator wykorzystujący OTA - operacyjny transkonduktancyjny wzmacniacz. Układ składa się z trzech wzmacniaczy i dwóch uziemionych kondensatorów. Obwód ma dużą impedancję wyjściową Oscylator prądowy drugiego rzędu wykorzystujący wzmacniacze transkonduktancyjne Keywords: Current-mode; quadrature oscillator; OTA. Słowa kluczowe: oscylator, wzmacniacz transkonduktancyjny, wyjście prądowe. Introduction The oscillator is important in electrical and electronic engineering. These circuit have been worldwide implemented like in communication system measuring tool systems, and signal processing. According to recent research reviews on designing current-mode quadrature oscillator circuit using active building block, the most recommended qualifications for an appropriate circuit design are functioning without additional external resistor, using grounded capacitors, consisting of high output impedance and being able to be controlled by electronic method, for instance. Quadrature oscillator (QO) is one of oscillator which provides two sinusoidal signals with 90 degrees phase difference. Some applications for quadrature signals are employed in telecommunications for single-sideband modulators and quadrature mixers [1]. In the recent years electroni[...]

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