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ŠOTNER, R. JEŘÁBEK, J. HERENCSÁR, N. VRBA, K. DOSTÁL, T.
Original Title
Features of multi-loop structures with OTAs and adjustable current amplifier for second-order multiphase/quadrature oscillators
Type
journal article in Web of Science
Language
English
Original Abstract
This contribution presents two types of second-order multiphase oscillators based on the multiple-loop transfer modification. The main aim of this paper is to show the possibilities of two structures to generate multiphase outputs (phase shifts of multiples of pi/2 and pi/4) and the features resulting from this type of synthesis. We focused on independently and electronically adjustable oscillation condition for simple implementation of automatic amplitude gain control circuit (AGC) and linear electronic control of oscillation frequency. Basic two-loop structure (typical for band-pass response in multifunctional filtering structures) with additional loop of the feedback for control of oscillation condition was used. There are two different requirements for oscillation condition fulfillment in the same topology. These aspects (actual polarity of the loops transfers) are important for design of the AGC in specific case. Mutual relations between generated signals at available outputs of the circuits are studied. Design is supported by the detailed signal-flow graphs. Final circuits were verified by PSpice simulations.
Keywords
Current amplifier, electronic control, multiphase oscillator, operational transconductance amplifier, quadrature oscillator, signal flow graphs.
Authors
ŠOTNER, R.; JEŘÁBEK, J.; HERENCSÁR, N.; VRBA, K.; DOSTÁL, T.
RIV year
2015
Released
8. 3. 2015
Publisher
Elsevier
ISBN
1434-8411
Periodical
AEU - International Journal of Electronics and Communications
Year of study
69
Number
5
State
Federal Republic of Germany
Pages from
814
Pages to
822
Pages count
9
URL
http://ac.els-cdn.com/S1434841115000278/1-s2.0-S1434841115000278-main.pdf?_tid=72689b14-af8f-11e4-839d-00000aab0f6b&acdnat=1423399316_01be415bb882de9f93029779ebfbcbff
BibTex
@article{BUT112830, author="Roman {Šotner} and Jan {Jeřábek} and Norbert {Herencsár} and Kamil {Vrba} and Tomáš {Dostál}", title="Features of multi-loop structures with OTAs and adjustable current amplifier for second-order multiphase/quadrature oscillators", journal="AEU - International Journal of Electronics and Communications", year="2015", volume="69", number="5", pages="814--822", doi="10.1016/j.aeue.2015.01.012", issn="1434-8411", url="http://ac.els-cdn.com/S1434841115000278/1-s2.0-S1434841115000278-main.pdf?_tid=72689b14-af8f-11e4-839d-00000aab0f6b&acdnat=1423399316_01be415bb882de9f93029779ebfbcbff" }