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    Current operational amplifier based voltage-mode MOS-C all-pass filter and its application
    (Gazi Üniversitesi, 2020) Çiçekli, Hasan; Karacan, İhsan; Gökçen, Ahmet
    In this work, a novel first order voltage-mode all-pass filter employing single active element named current operational amplifier (COA), two resistors, one capacitor and it’s application as sinusoidal oscillator is presented. The resistors are implemented by using MOSFETs, so the resulting MOS-C circuit is suitable for integration and the central frequency of the filter is electronically tunable. Workability of the proposed filter and it’s application is validated by PSPICE simulation software using TSMC 0.18 micron CMOS model parameters. Simulation results are in good consistency with theoretical analysis. The proposed circuit features precise frequency tuning, operability at low voltage, low distortion and low phase error.
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    Design of voltage-mode multifunction filter using single current operational amplifier
    (IEEE Computer Society, 2014) Çiçekli, Hasan; Gökçen, Ahmet
    In this study, a new voltage-mode multifunction filter based on single current operational amplifier (COA) is presented. The proposed topology employs single CMOS based COA and it provides lowpass, highpass, bandpass and notch filter functions by modifying only three admittances. The COA used in this study is implemented by CMOS based current conveyors and the validity of the proposed circuit is verified by PSPICE simulation programme. In simulation, the MOSIS 0.35 ?m CMOS process parameters are used. It is seen that the simulation results agree very well with the theoretical analysis. Also, the proposed circuit achieves a good THD (Total Harmonic Distortion) performance and the sensitivities of angular frequency to the passive components are shown to be low. © 2014 IEEE.
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    Realization of voltage mode notch filter based on current differencing transconductance amplifier
    (2013) Çiçekli, Hasan; Gökçen, Ahmet
    In this study, a new voltage mode notch filter based on Current Differencing Transconductance Amplifier (CDTA), which is a recently common used active building block in analog signal processing applications, is presented. The proposed filter's performance has been evaluated by PSPICE. In simulation the MOSIS CMOS 0.35?m model parameters used for CMOS based CDTA. The simulation results show that the proposed filter has high performance in terms of working both at low and high frequencies. It was seen that the simulation results verified the theory. Also, the sensitivities of the passive circuit components are shown to be low. © 2013 IEEE.