Yazar "Sagbas, Mehmet" seçeneğine göre listele

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    Component reduced floating +/- L, +/- C and +/- R simulators with grounded passive components
    (ELSEVIER GMBH, URBAN & FISCHER VERLAG, 2011) Sagbas, Mehmet
    In this study, a novel immittance simulator circuit is proposed. The proposed circuit can simulate any one of the floating positive or negative inductor simulator (+/- L), positive or negative capacitor simulator (+/- C) and positive or negative resistor simulator (+/- R). It uses only one current backward transconductance amplifier (CBTA) and two grounded passive components. The proposed simulator can be tuned electronically by changing the transconductance value of the CBTA. Moreover, the circuit does not require any conditions of component matching. It has a good sensitivity performance with respect to the tracking errors and the passive components. The performance of the proposed immittance simulator is demonstrated on the fourth-order voltage- and current-mode band-pass filters by using Pspice simulations based on the 0.25 mu m TSMC level-7 CMOS technology parameters. (C) 2011 Elsevier GmbH. All rights reserved.
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    Current mode leapfrog ladder filters using a new active block
    (ELSEVIER GMBH, URBAN & FISCHER VERLAG, 2010) Ayten, Umut E.; Sagbas, Mehmet; Sedef, Herman
    In this paper, a new multi-terminal active component, namely current backward transconductance amplifier (CBTA) is proposed. The design procedure for the systematic realization of current-mode ladder filters using proposed active component is also presented. In order to demonstrate that the CBTA considerably simplifies the leapfrog structure of the current-mode ladder filters, a fifth-order Butterworth low-pass filter that requires a minimum of active components is presented. The theoretical results are demonstrated by using PSPICE simulation. (C) 2009 Elsevier GmbH. All rights reserved.
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    Current-Mode SITO Filter Using a Single Active Component
    (IEEE, 2009) Ayten, Umut Engin; Sagbas, Mehmet; Sedef, Herman
    In this paper, current-mode filter using new active component, namely; current backward transconductance amplifier (CBTA) is presented. The proposed filter uses two resistors, two capacitors and only one CBTA. It has low active and passive sensitivities. The validity of the proposed circuit is demonstrated by PSPICE simulations and experimental results.
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    Design of CDBA-based active polyphase filter for low-IF receiver applications
    (TUBITAK SCIENTIFIC & TECHNICAL RESEARCH COUNCIL TURKEY, 2011) Sagbas, Mehmet
    A novel first-order active-RC polyphase filter section, using current differencing buffered amplifiers (CDBAs), is presented. The section uses 6 resistors, 2 capacitors, and 2 CDBAs. The transfer function of the proposed section has a single pole and optionally a single zero. Increasing the number of cascading sections, any higher order polyphase filter can be realized. This paper also introduces the leakage caused by element deviation and the effects of the amplifier in nonideal cases. Furthermore, nonideal performances of the proposed filter section are tested with PSpice simulations.
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    Electronically tunable floating inductance simulator
    (ELSEVIER GMBH, URBAN & FISCHER VERLAG, 2009) Sagbas, Mehmet; Ayten, Umut E.; Sedef, Herman; Koksal, Muhammed
    In this letter, a new floating inductance simulator circuit is presented. The proposed structure consists of only one grounded capacitor without any external resistors and two different active elements. The active elements are dual-output current-controlled current conveyor (DO-CCCII) and operational transconductance amplifier (OTA). The proposed inductance simulator can be tuned electronically by changing the biasing current of the DO-CCCIIs or by changing the current of the OTA. Moreover, the circuit does not require any conditions of component matching. It has a good sensitivity performance with respect to tracking errors. As an application, the proposed inductance simulator is used to construct a fourth-order resistively terminated LC band-pass filter. The theoretical analysis is verified by the SPICE simulation results. (C) 2008 Elsevier GmbH. All rights reserved.
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    A New Compact CMOS Realization of Sinusoidal Oscillator Using a Single Modified CBTA
    (BRUNO UNIV TECHNOL, DEPT RADIO ELECTRONICS, 2011) Herencsar, Norbert; Koton, Faroslav; Vrba, Kamil; Lahiri, Abhirup; Ayten, Umut E.; Sagbas, Mehmet; Dufek, I; Dusek, M; Fedra, Z; Fryza, T; Jakubova, I; Polak, L; Sebestova, D; Slanina, M; Sramek, P; Vsetula, P; Wolansky, D; Zachar, J
    In this paper, a new compact realization of sinusoidal oscillator using modified current backward transconductance amplifier (MCBTA) is reported. The proposed circuit employs a single MCBTA and four passive components including two grounded capacitors. The circuit provides completely de-coupled condition of oscillation (CO) of the frequency of oscillation (FO), i.e. no term in the CO is present in the FO and vice versa. Both the CO and FO are independently tunable by two different grounded resistors. The FO is also tunable by means of the transconductance and thereby is electronically tunable. SPICE simulation results have confirmed the workability of the proposed circuit.
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    REALIZATION OF A GENERAL RESISTORLESS ACTIVE BIQUAD USING CBTA
    (WORLD SCIENTIFIC PUBL CO PTE LTD, 2012) Sagbas, Mehmet; Koksal, Muhammet
    In this paper, a general electronically tunable resistorless biquad, which realizes current ratio transfer function using current backward transconductance amplifiers is proposed. The biquad contains only two active components and two grounded capacitors, which make it convenient for production by the integrated circuit technology. The proposed biquad realizes all of the basic second order filter characteristics: low pass, high pass, band pass, band reject, and finally all pass. It is convenient for cascading with other similar biquads as well as with any two-port circuit with low impedance input to achieve higher order filter characteristics. The simulations that are performed using PSPICE simulator exhibit satisfactory results coherent with the theory.
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    Voltage-Mode Multiphase Sinusoidal Oscillators Using CBTAs
    (IEEE, 2012) Sagbas, Mehmet; Ayten, Umut Engin; Herencsar, Norbert; Minaei, Shahram
    A voltage-mode multiphase sinusoidal oscillator (MSO) structure using current backward transconductance amplifier (CBTA) is presented. The oscillator can generate n voltage signals (n being even or odd) equally spaced in phase. n+1 CBTAs, n grounded capacitor and a grounded resistor are used for nth-state oscillator. The oscillation frequency can be independently controlled through transconductance (g(m)) of the CBTAs which are adjustable via bias currents. The effects caused by the non-ideality of the CBTA on the oscillation frequency and condition have been analyzed. The performance of the proposed circuit is demonstrated on a third-stage MSO by using PSPICE simulations based on the 0.25 mu m TSMC level-7 CMOS technology parameters.