Electronically tunable current-mode biquad filter employing CCCDTAs and grounded capacitors with low input and high output impedance

Jaikla, Winai; Khateb, Fabian; Siripongdee, Surapong; Supavarasuwat, Piya; Suwanjan, Peerawut

doi:10.1016/j.aeue.2013.05.014

Cited by 29 publications

(28 citation statements)

References 11 publications

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“…This will be economical on the numbers of transistors in CCTA. The transfer functions for the three responses of the¯lter can be expressed as [32][33][34][35] : The pole frequency (! 0 ) and the quality factor (Q) are de¯ned as:…”

Section: Ccta For Fractional Order Universal Filtersmentioning

confidence: 99%

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

Comedang¹,

Intani²

2014

J CIRCUIT SYST COMP

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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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Section: Ccta For Fractional Order Universal Filtersmentioning

confidence: 99%

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

Comedang¹,

Intani²

2014

J CIRCUIT SYST COMP

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“…Comparing some others active device, the outstanding features of this active element are larger dynamic range, high slew rate, electronic adjustability and low-input and high-output impedance etc. Meanwhile, from our investigations, CDTA element and its some modified devices have been widely used in analog signal processing circuit in recently years [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31]. However, so far, all of the reported CDTAs have two unavoidable problems: first, the transconductanse of the CDTA can not linearly tunable by controlling external bias current in a large input current range.…”

Section: Introductionmentioning

confidence: 96%

Multi-function Current Differencing Cascaded Transconductance Amplifier (MCDCTA) and Its Application to Current-Mode Multiphase Sinusoidal Oscillator

Jin

2015

Wireless Pers Commun

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In this study, a new versatile active element, namely multifunction current differencing cascaded transconductance amplifier (MCDCTA) is proposed. The proposed MCDCTA enjoys the advantages of low voltage, low-input and high-output impedance, wide bandwidth etc., and it simplifies the design of the current-mode analog signal processing circuit greatly, especially the design of high-order filter and oscillator circuits. Moreover, an example, a new current-mode multiphase sinusoidal oscillator (MSO) using the proposed MCDCTA is described in this paper. The proposed MSO consists only one MCDCTA and minimum grounded passive elements, it could provide 2n (n ] 2) output current signals with equally phase difference, and the output current signals are all at high output impedance terminals. The oscillation condition and the oscillation frequency of the MSO could be linearly and electronically adjusted by controlling the bias currents of MCDCTA, and it is suitable for variable frequency oscillator application. The operation of the proposed oscillator has been verified through PSPICE simulation and experimental results.

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“…There are few papers published on different structures of CDTA [2][3][4][5][6][7][8][9][10] in which its advantages and disadvantages have been shown and compared with other state of the art solutions. Apart from work on the structures of CDTA, there are numerous papers published on the applications such as current limiter [11], filters [12][13][14][15][16][17][18][19], modulators [20], multiplier [21], oscillators [22][23][24][25][26][27][28][29][30][31][32][33][34][35], rectifiers [36][37][38], Schmitt trigger [39], and squarer and square rooter circuit [40]. Tranconductance of CDTA plays a vital role in all the applications cited above.…”

Section: Introductionmentioning

confidence: 99%

Performance enhancement of current differencing transconductance amplifier (CDTA) by using a new approach of gm boosting and its application

Kumar

Gupta

2016

Optik

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Electronically tunable current-mode biquad filter employing CCCDTAs and grounded capacitors with low input and high output impedance

Cited by 29 publications

References 11 publications

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

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

Multi-function Current Differencing Cascaded Transconductance Amplifier (MCDCTA) and Its Application to Current-Mode Multiphase Sinusoidal Oscillator

Performance enhancement of current differencing transconductance amplifier (CDTA) by using a new approach of gm boosting and its application

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