High input impedance voltage-mode universal filter and its modification as quadrature oscillator using VDDDAs
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Date
2017-05-23
Authors
Tuntrakool, Sunti
Kumngern, Montree
Šotner, Roman
Herencsár, Norbert
Suwanjan, Peerawut
Jaikla, Winai
0000-0002-2430-1815Advisor
Referee
Mark
Journal Title
Journal ISSN
Volume Title
Publisher
NISCAIR ONLINE PERIODICALS REPOSITORY (NOPR)
Abstract
The second order universal voltage-mode filter using voltage differencing differential difference amplifiers (VDDDAs) has been proposed. It has high input impedance voltage-mode biquad filter with orthogonal tune of natural frequency and quality factor. The proposed filter simultaneously provides five filter responses: low-pass (LP), high-pass (HP), band-reject (BR), all-pass (AP) and band-pass (BP) in the same circuit topology. The natural frequency and quality factor can be tuned electronically and orthogonally dc bias current. The output impedance at output nodes HP, AP and BR has low impedance which can connect to other circuit without the use of voltage buffers. The proposed filter consists of three VDDDAs, one grounded resistor and two grounded capacitors. This makes the proposed filter suitable for integrated circuit development. With slightly modifying the proposed filter, the voltage-mode qudrature sinusoidal oscillator with low output impedance and independent control of condition of oscillation (CO) and frequency of oscillation (FO) has been achieved. The results shown in this paper are from PSPICE simulation and experiment to validate the proposed circuits.
Description
Citation
INDIAN JOURNAL OF PURE & APPLIED PHYSICS. 2017, vol. 55, issue 5, p. 324-332.
http://nopr.niscair.res.in/handle/123456789/41817
http://nopr.niscair.res.in/handle/123456789/41817
Document type
Peer-reviewed
Document version
Published version
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Language of document
en
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Defence
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Creative Commons Attribution-NonCommercial-NoDerivatives 2.5 Generic
http://creativecommons.org/licenses/by-nc-nd/2.5/
http://creativecommons.org/licenses/by-nc-nd/2.5/