CFTA Based MISO Current-mode Biquad Filter
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1 CFTA Based MISO Current-ode Biquad Filter PEERAWUT SUWANJAN and WINAI JAIKLA Departent of Engineering Education, Faculty of Industrial Education King Mongkut's Institute of Technology Ladkrabag Chalongkrung Rd., Ladkrabang, Bangkok, THAILAND Abstract: - This article presents a four-inputs single output biquadratic filter perforing copletely standard functions: low-pass, high-pass, band-pass, band-reject and all-pass functions, based on single current follower transconductance aplifier (CFTA). The features of the circuit are that; the quality factor and natural frequency can be tuned electronically via the input bias current; the circuit description is very siple, consisting of erely 1 CFTA, 1 resistor and 2 grounded capacitors; the filter does not require inverting-type input current signal. Additionally, each function response can be selected by suitably selecting input signals with digital ethod. Using only single active eleent and grounded capacitors, the proposed circuit is very suitable to further develop into an integrated circuit. The PSPICE siulation results are depicted. The given results agree well with the theoretical anticipation. The total power consuption is approxiately 2.01W at ±1.25V supply voltages. Key-Words: - analog filter, current ode, CFTA, ultiple-inputs single-output. 1 Introduction Recently, current-ode circuits have been receiving considerable attention due to their potential advantages such as inherently wide bandwidth, higher slew-rate, greater linearity, wider dynaic range, sipler circuitry and lower power consuption [1]. One of the standard research topics in current-ode circuit design is an analog filter. This circuit is iportant in electrical and electronic applications, widely used for continuoustie signal processing. It can be found in any fields: including, counications, easureent, and instruentation, and control systes [2-3]. One of ost popular analog current-ode filters is a ultiple-input single-output biquadratic filter (MISO) which different output filter functions can be realized siply by different cobinations of switching on or off the input currents where the selection can be done digitally using a icrocontroller. Moreover, the high-output ipedance of current-ode filters are of great interest because they ake it easy to drive loads and they facilitate cascading without using a buffering device [4-5]. Fro our survey, it is found that several ipleentations of MISO current-ode filters have been reported [6-21]. Unfortunately, these reported circuits suffer fro one or ore of following weaknesses: Use ore than one active eleent [7, 9, 13, 14, 16, 17, 18, 19, 20, 21]. Excessive use of the passive eleents, especially external resistors [7, 9, 10, 11, 14, 15, 16]. Requireent of inverting-type input current signal(s) to realize all the responses [6, 14, 15, 17, 18, 20]. Lack of electronic adjustability [7, 10, 11, 15, 16]. Requireent of changing circuit topologies to achieve several functions [10]. Requireent of eleent-atching conditions [10, 11, 15, 18]. Use of floating capacitor which is not desirable for IC ipleentation [15]. The current follower transconductance aplifier (CFTA) is a recently reported active coponent. It see to be a versatile coponent in the realization of a class of analog signal processing circuits, especially analog frequency filters [22-23]. It is really current-ode eleent whose input and output signals are currents. In addition, it can also adjust the output current gain. This work is arranged to propose a new MISO current ode biquadratic filter, ephasizing on use of single CFTA. The features of proposed circuit are that: the proposed universal filter can provide ISBN:
2 copletely standard functions without changing circuit topology by appropriately selecting the input signals: the circuit description is very siple, it consists of single CFTA, single resistor and 2 grounded capacitors, which is suitable for fabricating in onolithic chip: the filter does not require inverting-type input current signal(s). In addition, the natural frequency and the bandwidth can be tuned electronically by adjusting the bias currents. Its perforances are illustrated by PSPICE siulations, they show good agreeent as entioned. 2 Principle of Operation 2.1 Basic concept of CFTA Since the proposed circuit is based on CFTA, a brief review of CFTA is given in this section. The scheatic sybol and the ideal behavioural odel of the CFTA are shown in Fig. 1(a) and (b), respectively. It has one low-ipedance current input f port. The current flows fro port z. In soe applications, to utilize the current through z terinal, an auxiliary z c (z-copy) terinal is used [22]. The internal current irror provides a copy of the current flowing out of the z terinal to the z c terinal. The voltage v z on z terinal is transferred into current using transconductance g, which flows into output terinal x. The g is tuned by I B. In general, CFTA can contain an arbitrary nuber of x terinals, providing currents I x of both directions. The characteristics of the ideal CFTA are represented by the following hybrid atrix: Vf I f I z, zc Vx. (1) I 0 0 g x V z For CMOS CFTA, the g is written as I out 1 g 2 1 g s I I I s s I RC RC C RC RC C 1 g in1 in2 in3 in v f v f 2 s s RC 1 RC 1 C 2 f I B CFTA z z v z v z (a) g v c i v zc zc z c v zc (b) Figure 1. CFTA (a) Sybol (b) Equivalent circuit. x i x i x v x v x.(3) Fro Eq. (3), the agnitudes of input currents I in1, I in2, I in3 and I in4 can be chosen as in Table I to obtain a standard function of the network. The circuit of digital selection can be seen in [24]. It is found that the proposed filter does not require inverting-type input current signal to synthesis all the filter responses. Fro Eq. (3), the natural frequency (ω 0 ) and quality factor (Q 0 ) of each filter response can be expressed as and g 0, (4) CC R Q 1 2 CRg 1 0. (5) C2 It is found fro Eqs. (4) and (5) that if g ki B, the natural frequency and quality factor can be electronically adjusted. g ki, (2) B I B where k C W L O OX. Here k and I B are the physical transconductance paraeter of the MOS transistor and input bias current, respectively. I in1 I in2 C 1 R f I in3 CFTA z z c x I in4 2.2 Proposed MISO current-ode filter The proposed MISO current-ode filter is shown in Fig. 2. Straightforwardly analyzing the circuit in Fig. 2, the output current can be obtained as C 2 I out Figure 2. Proposed MISO current-ode biquadratic filter. ISBN:
3 TABLE I The I in1, I in2, I in3 and I in4 value selections for each filter function response Filter Responses Input selections I O I in1 I in2 I in3 I in4 LP HP BP BR AP Circuit sensitivities The sensitivities of the proposed circuit can be found as and S S 1 1, S, (6) C1, C2, R g 1 1 ; S. (7) 2 2 Q0 Q0 C1, R, g C2 Therefore, all the active and passive sensitivities are equal or less than unity in agnitude. 3 Siulation Results To prove the perforances of the proposed filter, the PSPICE siulation progra was used for the exaination. Internal construction of CFTA used in siulation is shown in Fig. 4. The PMOS and NMOS transistors have been siulated by respectively using the paraeters of a 0.25µ TSMC CMOS technology [25]. The aspect ratios of PMOS and NMOS transistor are listed in Table II. The circuit was biased with ±1.25V supply voltages, V BB =-0.55V, C 1 =C 2 =0.1nF, I B =100µA and R=1kΩ. It yields the natural frequency of 1.71MHz. The results shown in Fig. 4 are the gain and phase responses of the proposed biquad filter fro Fig. 2. There are seen that the proposed filter can provide low-pass, high-pass, band-pass, band-reject and allpass functions dependent on selection as shown in Table I, without odifying circuit topology. TABLE II Diensions of the MOS transistors MOS Transistors W( )/ L( ) M1, M2 M15, M16 M14 Another PMOS Another NMOS 1/ / /0.25 5/0.25 3/ d 100d 0d Figure 3. Internal construction of CFTA Gain -100d k 100k 300k 1.0M 3.0M 10M 30M 100M Frequency (Hz) (a) (b) (c) (d) (e) Figure 4. Gain and phase responses of the biquad filter in voltage-ode for (a) LP (b) HP (c) BP (d) BR (e) AP. Fig. 5 shows gain responses of band-pass function where I B is set for several values. It is found that natural frequency can be adjusted electronically. The transient response of the ISBN:
4 proposed filter fro band-pass function for center frequency of 1.71MHz can be seen in Fig. 6. Total power consuption is about 2.01W. Current (µa) Figure 5. Current-ode band-pass responses for different values of I B. Figure 6. Transient responses at center frequency of 1.71MHz obtained fro the proposed filter for BP function. 4 Conclusion The ultiple-inputs single output biquadratic filter based on single CFTA is presented. The advantages of the proposed circuit are that: it perfors lowpass, high-pass, band-pass, band-reject and all-pass functions dependent on an appropriate selection of three signals: the bandwidth and the natural frequency can be electronically controlled via input bias currents, it is easily odified to use in control systes using a icrocontroller [1]. The circuit description coprises only 1 CFTA, 1 resistor and 2 grounded capacitors. With entioned features, it is very suitable to realize the proposed circuit in onolithic chip to use in battery-powered, portable electronic equipents such as wireless counication syste devices. References: [1] C. Touazou., F. J. Lidgey, and D. G. Haigh, Analogue IC design: the current-ode approach, London: Peter Peregrinus, [2] A. S. Sedra, and K. C. Sith, Microelectronic circuits, 3rd ed., Florida: Holt, Rinehart and Winston, [3] M. A. Ibrahi, S. Minaei, and H. A. Kuntan, A 22.5 MHz current-ode KHN-biquad using differential voltage current conveyor and grounded passive eleents, International Journal of Electronics and Counication (AEU), vol. 59, pp , [4] A. M. Solian, New current ode filters using current conveyors, International Journal of Electronics and Counication (AEU), vol. 51, pp , [5] W. Tangsrirat and W. Surakapontorn, Systeatic realization of cascadable currentode filters using CDTAs, Frequenz, vol. 60, pp , [6] M. Siripruchyanun and W. Jaikla, Electronically controllable current-ode universal biquad filter using single DO- CCCDTA, Circuits Syste Signal Processing, vol. 27, no. 1, pp , [7] J-W. Horng, Current-ode universal biqudaratic filter with five inputs and one output using tree ICCIIs, Indian Journal of Pure & Applied Physics, vol. 49, pp , [8] S. V. Singh, S. Maheshwari, D. S. Chauhan, Single MO-CCCCTA-based electronically tunable current/trans-ipedance-ode biquad universal filter, Circuits and Systes, vol. 2, pp. 1-6, [9] C.-N. Lee, Multiple-ode OTA-C universal biquad filters, Circuits Syst Signal Process, vol. 29, pp , [10] E. Arslan, B. Metin, O. Cicekoglu, Multiinput single-output cacadable current-ode universal filter topology with a single current conveyor, Proceedings of the Third IASTED International Conference Circuits, Signals, and Systes, pp , [11] R. Senani, K. K. Abdalla, D. R. Bhaskar, A state variable ethod for the realization of universal current-ode biquads, Circuits and Systes, vol. 2, pp , [12] N. Pandey, S. K. Paul, VM and CM universal filters based on single DVCCTA, Active and Passive Electronic Coponents, vol. 2011, Article ID [13] S. V. Singh, S. Maheshwari, D. S. Chauhan, Electronically tunable current-ode SIMO/MISO universal biquad filter using MOCCCCTAs, International J. of Recent Trends in Engineering and Technology, vol. 3, no. 3, pp , [14] W. Chunhua, L. Haiguang, Z. Yan Universal current-ode filter with ultiple inputs and one output using MOCCII and MO-CCCA, International Journal of Electronics and Counication (AEU), vol. 63, pp , ISBN:
5 [15] S. Özcan, H. Kuntan, O. Çiçekoglu A novel ulti-input single-output filter with reduced nuber of passive eleents using single current conveyor, Proceedings of 43rd IEEE Midwest Syp. on Circuits and Systes, pp. 1-3, [16] V. Sawangaro, T. Duawipata, W. Tangsrirat, W. Surakapontorn Cascadable three-input single-output current-ode universal filter using CDBAs, The 2007 ECTI International Conference, pp , [17] O. Channusin, T. Pukkalanun, W. Tangsrirat, Universal current-ode biquad with iniu coponents, Proceedings of the 2011 International Multi-Conference of Engineering and Coputer Scientists, [18] W. Tangsrirat and W. Surakapontorn, Electronically tunable current-ode universal filter eploying only plus-type currentcontrolled conveyors and grounded capacitors, Circuits Syste Signal Processing, vol. 27, no. 6, pp , [19] W. Tangsrirat, Cascadable current-controlled current-ode universal filters using CDTAs and grounded capacitors, Journal of Active and Passive Electronic Devices, vol. 4, pp , [20] W. Tangsrirat, T. Duawipata, W. Surakapontorn Multiple-input single-output current-ode ultifunction filter using current differencing transconductance aplifiers, International Journal of Electronics and Counication (AEU), vol. 61, pp , [21] W. Tangsrirat, T. Pukkalanun, Structural generation of two integrator loop filters using CDTAs and grounded capacitors, International Journal of Circuit Theory and Applications, vol. 39, pp , [22] D. Biolek, R. Senani, V. Biolkova, Z. Kolka, Active eleents for analog signal processing: classification, review, and new proposals, Radioengineering, vol. 17, no. 4, p , [23] N. Herencsar, J. Koton, K. Vrba and J. Misurec, A novel current-ode SIMO type universal filter using CFTAs, Conteporary Engineering, Sciences, vol.2, no.2, pp.59-66, [24] Y. Maruyaa, A. Hyogo, and K. Sekine, A digitally prograable CMOS biquad filter using current-ode integrators, IEICE Transactions on fundaentals, vol. E85-A, pp [25] P. Proee, K. Angkeaw, M. Sodunyakanok, K. Dejhan. CMOS-based near zero-offset ultiple inputs ax in circuits and its applications, Analog Integr. Circuits Signal Process, vol. 61, pp , ISBN:
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