A ± 0.2 V, 0.12 Μw Ccta Using Vtmos and an Application Fractional-Order Universal Filter

Abstract

In this paper, a variable threshold voltage metal oxide semiconductor (VTMOS)¯eld e®ect transistor is used to improve an ultra-low voltage, ultra-low power current conveyor transconductance ampli¯er (CCTA). To achieve the desired result, an analytical subthreshold VTMOS model is used. Designs that utilize the TSMC 0.18 m technology are veri¯ed using PSPICE simulation. The power consumption is simply 0.12 W at a AE 0.2 V supply voltage. The proposed CCTA is synthesized using fractional-order (FO) universal¯lters 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 FŌ lters are constructed using two FO capacitors of orders and (0 < ; 1). The FO¯lters provide improved performance in terms of pole frequency compared with conventional-order lters. The¯lter has a low power consumption of 0.71 W at a AE 0.2 V supply voltage. The validity of the proposed¯lter is veri¯ed through PSPICE simulations. J CIRCUIT SYST COMP 2014.23. Downloaded from www.worldscientific.com by THE UNIVERSITY OF NEW SOUTH WALES on 03/16/15. For personal use only. T. Comedang & P. Intani 1450126-2 J CIRCUIT SYST COMP 2014.23. Downloaded from www.worldscientific.com by THE UNIVERSITY OF NEW SOUTH WALES on 03/16/15. For personal use only. A AE 0.2 V, 0.12 W CCTA Using VTMOS and an Application FO Universal Filter 1450126-9 J CIRCUIT SYST COMP 2014.23. Downloaded from www.worldscientific.com by THE UNIVERSITY OF NEW SOUTH WALES on 03/16/15. For personal use only. A AE 0.2 V, 0.12 W CCTA Using VTMOS and an Application FO Universal Filter 1450126-17 J CIRCUIT SYST COMP 2014.23. Downloaded from www.worldscientific.com by THE UNIVERSITY OF NEW SOUTH WALES on 03/16/15. For personal use only. T. Comedang & P. Intani 1450126-18 J CIRCUIT SYST COMP 2014.23. Downloaded from www.worldscientific.com by THE UNIVERSITY OF NEW SOUTH WALES on 03/16/15. For personal use only.

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