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A +/- 0.2 V, 0.12 mu W CCTA USING VTMOS AND AN APPLICATION FRACTIONAL-ORDER UNIVERSAL FILTER

TitleA +/- 0.2 V, 0.12 mu W CCTA USING VTMOS AND AN APPLICATION FRACTIONAL-ORDER UNIVERSAL FILTER
Publication TypeJournal Article
Year of Publication2557
Secondary Authorsพัฒนา อินทนิ
JournalJOURNAL OF CIRCUITS SYSTEMS AND COMPUTERS
Volume23
Issue9
Date PublishedOCT 2014
Type of Articleบทความวิจัย
ISSN0218-1266
Accession NumberWOS:000341242900007
KeywordsCCTA, fractional order, VTMOS
Abstract

In this paper, a variable threshold voltage metal oxide semiconductor (VTMOS)field effect transistor is used to improve an ultra-low voltage, ultra-low power current conveyor transconductance amplifier (CCTA). To achieve the desired result, an analytical subthreshold VTMOS model is used. Designs that utilize the TSMC 0.18 mu m technology are verified using PSPICE simulation. The power consumption is simply 0.12 mu W at a +/- 0.2 V supply voltage. The proposed CCTA is synthesized using fractional-order (FO) universal filters that can simultaneously realise low pass (LP), high pass (HP) and bandpass (BP) responses with independent control of quality factor and pole frequency by transconductances (g(m)). Moreover, the circuit has low input and high output impedance which would be an ideal choice for cascading in current-mode circuit. The FO filters are constructed using two FO capacitors of orders alpha and beta (0 < alpha, beta <= 1). The FO filters provide improved performance in terms of pole frequency compared with conventional-order filters. The filter has a low power consumption of 0.71 mu W at a +/- 0.2 V supply voltage. The validity of the proposed filter is verified through PSPICE simulations.

URLhttps://www.worldscientific.com/doi/pdf/10.1142/S0218126614501266
DOI10.1142/S0218126614501266
Reprint EditionComedang, T (reprint author)