High Frequency Controlled Universal Current Mode Filter using second generation conveyor CCII
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1 SSN: nternational Journal of Advances in Computer and Electronics Engineering Volume: ssue: 3, March 7, pp. 6 High Frequency Controlled Universal Current Mode Filter using second generation conveyor CC Thouraya ETTAGHZOUT, Dr. Néjib HASSEN, Dr. Kamel BESBES 3 Micro-electronics and instrumentation laboratory University of Monastir, Tunisia Centre for Research on Microelectronics and Nanotechnology of Sousse, Technopole of Sousse, Tunisia &3 thourayataghzouti@yahoo.fr ; nejib.hassen@fsm.rnu.tn ; kamel.besbes@fsm.rnu.tn 3 Abstract: A new universal current mode filter circuit composed by three multi-output second generation current conveyor circuits (MOCC), two controlled active resistances and two passive capacitors is presented. This filter can realize all the five standard filter functions, namely low pass, band pass, high pass, notch and all pass, without changing the circuit topology. TSPCE simulation using.8 µm process BSM3V3 level 49 and ±.8 V power supply voltage confirm the theoretical analysis. Simulated frequency response of gain confirms the theoretical prediction of low sensitivity for passive and active components. Keyword: Second generation current conveyor (CC); Controlled active resistance; Universal filter; Current mode.. NTRODUCTON Analogue filters are considered as a basic building block of signal processing. t can be found in almost every telecommunication systems, measurement, instrumentation and control systems. These types of circuits can be used to separate audio signals before applying to loudspeakers, to combine or to separate several telephone conversations or to select a particular radio station from the radio receiver by rejecting all other channels. Since 97, many universal filter configurations using second generation current conveyor (CC) have been reported in the literature. There are those who have multiple inputs single output (MSO) [-3], others who have a single input multiple output (SMO) [4-6] and others who have multiple-input multipleoutput (MMO) [7,8] operating in current mode, voltage mode or mixed mode. n 7, Worapong Tangsrirat and al. [7] have proposed a controlled current-mode universal biquadratic filter with two inputs and three outputs. The proposed circuit employs only three DOCCCs and two grounded capacitors, which provides the advantage of an electronic tuning capability. n, Hua-Pin Chen [9] has proposed a voltage mode universal filter with three inputs and two outputs employing one second generation current conveyor CC, three resistors and two capacitors. n 8, P. KUMAR has proposed a high input impedance voltage-mode second order universal filter composed by three second generation current conveyors (CCs), three resistors and two capacitors []. This circuit can realized all the standard filter functions, namely low pass, high pass, band pass, notch and all-pass filter from the same configuration. n 3, Neeta Pandey [] has proposed an electronically tunable mixed mode universal filter based on multiple output current controlled current conveyor (MOCCC) and two grounded capacitors. The proposed topology can be used to realize all four modes without any alteration i.e., voltage (VM), current (CM), transimpedance (TM) and transadmittance (TAM). n this paper, a new current mode universal filter constructed by three multi-output second generation current conveyor circuits, two grounded resistances and two capacitors is presented. n order to minimize surface and temperature of filter, the passive resistances are replaced by controlled active resistances, through the use of input stage of standard controlled second generation current conveyor circuit (CCC). The proposed filter can realized all the five standard function filters without changing the circuit topology. The simulation results are performed by TSPCE with TSMC.8 μm CMOS process parameters and ±.8 V supply voltage.. PROPOSED CURRENT MODE UNVERSAL FLTER. Circuit Description
2 SSN: nternational Journal of Advances in Computer and Electronics Engineering Volume: ssue: 3, March 7, pp. 6 N BP C MOCC MOCC HP RP R C MOCC LP AP R Figure Universal current mode filter circuit based on MOCC The proposed single input five outputs current mode universal filter is shown in Fig. This filter is com- posed by three multi- output second generation current conveyor circuits, two grounded resistances and two capacitors. t can realize all the five standard filter functions without changing the topology. Using standard notation, the relationship between input and output terminals of second generation current conveyor circuit can be characterized by: V V Z Z After routine analysis of this filter, its transfer functions can be described as: Low pass filter (LP): LP High pass filter (HP): HP Band pass filter (BP): BP Reject pass filter (RP): RP All pass filter (AP): s R RCC src s R RCC s R RCC src sr C s R RCC src s R RCC s R RCC src () () (3) (4) The natural angular frequency and the quality factor expressions can be given as: Q R R C C RC RC Both ω and Q passive sensitivities are given by: SR S R S C S C S S S Q Q R C Q Q R C S Taking the non-idealities of CC into account, the relationships between terminal devices are become as follows: V V Z Z Where α = - ε i and ε i denotes the current tracking error, also β = - ε v and ε v denotes the voltage tracking error. The transfer functions have become: Low pass filter (LP): LP s R R C C s R C 33 (6) AP s R RCC src s R RCC src (5) High pass filter (HP):
3 SSN: nternational Journal of Advances in Computer and Electronics Engineering Volume: ssue: 3, March 7, pp. 6 HP s R RCC s R R C C s R C 33 (7) Band pass filter (BP): BP s RC s R R C C s R C 33 Reject pass filter (RP): RP s R RCC s R R C C s R C 33 All pass filter (AP): AP s R RCC s RC 33 s R R C C s R C 33 (8) (9) () Figure Two active resistances controlled by bias current Fig. presents the input stage of standard controlled second generation current conveyor circuit. This circuit is composed by a mixed trans-linear loop (M, M, M3, M4), two current mirrors (M5, M6 and M7, M8, M9) and two current sources M, M. The relationship between terminals and is given by: V V -V V -V () gsm gsm sgm 4 sgm 3 The natural angular frequency and the quality factor expressions have become as: Q R R C C RC RC 3 3 Both ω and Q active sensitivities are given by: S S S S S Q Q Q Q 3 3 S S S S Q S From the above calculations, it can be seen that all sensitivities are smaller than.5 in magnitude. To minimize the temperature effect, passive resistances are replaced by active resistances controlled by current source, through the use of input stage of standard controlled second generation current conveyor circuit (CCC) [, 3]. Since the drain currents of transistors M and M3 are equal to, the expression of potential difference V has become as: V V M W W C C n ox n ox L M L M C W W C M 4 p ox p ox L M4 L M3 () (3) The current at terminal is equal to the different drain currents of transistors M and M4. For that, the voltage expression at terminal is given by: V V W W C C C ox p ox n ox L M4 L M (4) By connecting the terminal to ground, the voltage at terminal is as the form of ground resistance traversed by current and variable by a bias current. The active resistance expression is given by: R W W Cox p n L M4 L M (5) n case of need more than a resistance, it's enough to duplicate the output stage as shown in Fig.. 3
4 Active resistance (kohm) Central frequency (MHz) (db) SSN: nternational Journal of Advances in Computer and Electronics Engineering Volume: ssue: 3, March 7, pp. 6 V DD M7 M M9 M M8 M M9 M6 M3 M7 M8 Z M4 M3 M5 M6 M M M4 M5 V SS Figure 3 Second generation current conveyor circuit. Simulation Results To verify the theoretical results obtained of proposed current mode universal filter, the simulations are perform by using TSPCE simulation program based on BSM3v3 transistor model (level 49) for TSMC.8 μm CMOS process available from MOSS at 5ºC and CMOS implementation of second generation current conveyor circuit [4] as shown in Fig.3 with the dimensions transistors are taken as specified in Table. The CC circuit is powered at supply voltage ±.8V. t has a rail to rail dynamic range, good accuracy, low resistor at borne (4.79 Ω), low power consumption (.9 mw) and wide bandwidth current mode (3.9 GHz) and voltage mode (4.3 GHz). The simulation results of current-mode universal filter are in good agreement with the theoretical results. The variation of bias current causes variation of active resistance and center frequency. The simulation result presented in Fig 4 is obtained by fixing two capacitors C and C to 3pF and varied each time the current polarization. 3,,5,,5,,5 Active resistance Central frequency, Bias current (µa) Figure 4 Variation of value active resistor and center frequency according by bias current 5 TABLE ASPECT RATOS OF THE TRANSSTORS Transistor W(μm)/L (μm) M, M, M9 5/.8 M3, M4, M5, M6, M, M, /.8 M3, M4, M5 M7, M8, M9, M, M6, M7, /.8 M8, Ma, Mb Fig. 5 presents respectively the simulation results of high-pass, band-pass, reject-pass, low-pass, all-pass current mode filter with a bias current equal to µa. The simulated frequency responses and phase responses agree well with the theoretical ones as expected, where as the difference between them arises from non-idealities such as non-ideal gain and parasitic impedance effects of the MOCC. t is possible to vary the center frequency of current mode universal filter to keeping the quality factor set to unity by varying only bias current (Fig 6). - 6µA µa µa 6µA M Figure 6 Center frequency variation of current mode universal filter G 4
5 (db) (db) (db) (db) (db) SSN: nternational Journal of Advances in Computer and Electronics Engineering Volume: ssue: 3, March 7, pp M M G M M G Frequency(Hz) (a) (b) M M G M M G Frequency(Hz) (c) (d), 8 -, 78 -,4 76 -,6 74 -, , 68 -, 66 -,4 M M G (e) Figure 5 Current mode simulation results of mixed mode universal filter: (a): High pass, (b): Band pass, (c): Reject pass, (d): Low pass, (e): All pass 5
6 SSN: nternational Journal of Advances in Computer and Electronics Engineering Volume: ssue: 3, March 7, pp CONCLUSON n this paper, a new current mode universal filter composed by three multi output second generation current conveyor (MOCC) circuits, two active resistances and two passive capacitors is presented. t can realize all the standard filter functions, namely low-pass, band-pass, high-pass, notch and all-pass, without changing the circuit topology. This filter is characterized by high output impedances good for cascadability to another circuits, a power consumption about.73mw, a maximal frequency of.4 GHz and low active and passive sensitivities. The simulation results with TSPCE using.8μm TSMC CMOS technology have a good accurate with the theoretical results. REFERENCES [] Winai JAKLA, Surapong Siripongdee, (), "Peerawut SUWANJAN, MSO Current-mode Biquad Filter with ndependent Control of Pole Frequency and Quality Factor", Radioengineering, VOL., NO. 3. [] Pipat Prommee, Montri Somdunyakanok, (), "CMOSbased current-controlled DDCC and its applications to capacitance multiplier and universal filter", nternational journal of electronics and communication, PP -8, 65. [3] Ashish Ranjan and Sajal K. Paul, (), "Universal Filter Using Analog Building Block", nternational Conference on Circuits, System and Simulation. [4] Chunhua Wanga, Jing ua, Ali Ümit Keskinb, Sichun Dua, Qiujing Zhang, (), "A new current-mode current-controlled SMO-type universal filter", nternational Journal of Electronics and Communications. [5] Chunhua Wang, an Zhao, Qiujing Zhang, Sichun DU, (9), "A New Current Mode SMO-Type Universal Biquad Employing Multi-Output Current Conveyors (MOCCs)", Radioengineering, VOL. 8, NO.. [6] Thouraya Ettaghzouti, Néjib Hassen, Kamel Besbes, (5), "Novel second generation current conveyor and voltage mode universal filter application", Systems, Signals & Devices (SSD), th nternational Multi-Conference on. [7] Worapong Tangsrirat, Wanlop Surakampontorn, (7), "High output impedance current-mode universal filter employing dual-output current-controlled conveyors and grounded capacitors", nternational Journal of Electronics and Communications. [8] Kasim Karam Abdalla, (3), "Universal Current-Mode Biquad Employing Dual Output Current Conveyors and MO- CCCA with Grounded Passive Element", Circuits and Systems, 4, [9] Hua-Pin Chen, (), "Single CC-based voltage-mode universal filter, Analog ntegr Circ Sig Process, 6, pp [] P. Kumar, K. Pal, S. Rana, (9), "High nput mpedance Universal Biquadratic Filters Using Current Conveyors", Journal of Active and Passive Electronic Devices, Vol. 3, pp [] Neeta Pandey, (3), "Mixed mode universal filter, Journal of Circuits, Systems and Computers,. [] Néjib Hassen, Thouraya Ettaghzouti, Kamel Besbes, (), "High-performance Second-Generation Controlled Current Conveyor CCC and High Frequency Applications", World Academy of Science, Engineering and Technology, 6. [3] Zia Abbas, Giuseppe Scotti and Mauro Olivieri, (), "Current Controlled Current Conveyor (CCC) and Application using 65nm CMOS Technology", nternational Journal of Electrical, Computer, Energetic, Electronic and Communication Engineering Vol:5, No:7. [4] Thouraya Ettaghzouti, Néjib Hassen, Kamel Besbes, (5), "A Novel Low-Voltage Low-Power CC Based On Super Class AB CMOS OTA Cells And Filter Application", th nternational Multi-Conference on Systems, Signals & Devices. Authors Biography Thouraya Ettaghzouti was born in Tozeur in 983, Tunisia. She received the M.S. degree from the Faculty of Sciences of Monastir in 8, the Ph.D. degree from at the same University at the Microelectronic and nstrumentation Laboratory in 6. She is interested to the implementation of low voltage low power integrated circuit design. Dr. Néjib HASSEN was born in 96 in Moknine, Tunisia. He received the B.S. degree in EEA from the University of Aix- Marseille, France in99, the M.S. degree in Electronics in 99 and the Ph.D. degree in 995 from the University Louis Pasteur of Strasbourg, France. From 99 to 996, he has worked as a researcher in CCD digital camera design. He implemented RDS new technique radiuses CCD noise at CRN of GOA in Strasbourg. n 995, he joined the Faculty of Sciences of Monastir as an n 995, he joined the Faculty of Sciences of Monastir as an Assistant Professor of physics and electronics Since 997, he has worked as researcher in mixed-signals neural networks. Currently, he is professor of microelectronics and electronics to SMM University of Monastir. He is focusing on the implementation low voltage - low power mixed and analog circuits. Dr. Kamel BESBES was born in Monastir, Tunisia, in 96. He received the B.S. degree from the Faculty of Sciences of Monastir in 985, the M.S. degree from the Ecole Centrale de Lyon, Lyon, France, in 986, the Ph.D. degree from the nstitut National des Sciences Appliquées de Lyon (NSA), Lyon, in 989, and the Doctorat d Etat degree from the Faculty of Sciences of Tunis, Tunisia, in 995. n 989, he joined the Faculty of Sciences of Monastir as an Assistant Professor of physics and electronics. He is now Director of Centre for Research on Microelectronics and Nanotechnology of Sousse (CRMN), Director of Microelectronic and nstrumentation Laboratory and Professor at University of Monastir. His research work and interest are focused on microelectronics, modeling, and instrumentation. 6
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