trakya univ j sci Trakya Üniversitesi Fen Bilimleri Dergisi 1305-6468 Trakya University VOLTAGE TYPE FIRST ORDER ALL-PASS FILTER EMPLOYING FULLY DIFFERENTIAL CURRENT FEEDBACK OPERATIONAL AMPLIFIER AND QUADRATURE OSCILLATOR Ün Mahmut Beykent University Ayazağa, Faculty of Eng.-Arch., Elect-Communication Eng. Dept, Şişli, İstanbul Kaçar Fırat İstanbul University, Faculty of Eng., Elect.-Electronic Eng. Dept., Avcılar, İstanbul 08 05 2016 9 1 1 5 08 05 2016 Copyright © 2000, Trakya Üniversitesi Fen Bilimleri Dergisi 2000 Trakya Üniversitesi Fen Bilimleri Dergisi

An improvement voltage mode first order all-pass filter configuration is proposed. The presented circuit uses a single fully differential current feedback operational amplifier (FDCFOA), resistors and a grounded capacitor. High input impedance of the proposed filter enables the circuit to be cascaded without additional buffers. It does not impose any component matching constraint in analog signal processing circuits. Also higher order all-pass filter could be achieved by cascading the proposed all-pass sections. In order to demostrate the performance of the proposed filter a new voltage mode oscillator is introduced as an application example. Furthermore the theoretical results are verified with SPICE simulations using a CMOS realization of FDCFOA

Gerilim modunda birinci dereceden tüm geçiren yeni bir süzgeç devresi önerilmiştir. Önerilen devrede bir tam diferansiyel akım geribeslemeli işlemsel kuvvetlendirici, dirençler ve topraklı bir kapasite bulunmaktadır. Önerilen devrenin yüksek giriş direnci, ek tampon kullanılmadan devrenin kaskad bağlanabilmesini sağlamaktadır. Analog işaret işleme devrelerinde herhangi bir eleman denkleştirme koşuluna gerek duyulmamaktadır. Aynı zamanda daha yüksek dereceden tüm geçiren süzgeçler önerilen birinci dereceden süzgeçler kaskad bağlanarak elde edilebilmektedir. Önerilen süzgecin başarımını göstermek amacıyla, bir uygulama örneği olarak gerilim modunda yeni bir osilatör tanıtılmıştır. Bundan başka teorik sonuçlar, FDCFOA elemanının CMOS gerçeklenmesi kullanılarak SPICE benzetimleriyle doğrulanmıştır.

 Tüm geçiren süzgeç tam farksal akım geribeslemeli işlemsel kuvvetlendirci analog tümdevreler quadrature osilatör All-pass filter fully differential current feedback operational amplifier analog integrated circuits quadrature oscillator. [1] Schauman, R., Valkenburg E., Design of analog filters. Oxford University Press, New York, 2001. [2] Donald, T. C., David, T. C., Jason, R. G., A high frequency integrable band-pass filter configuration, IEEE Transactions on Circuits and Systems, 44 (1997) 856-860. [3] Cicekoglu, O., Kuntman, H., Berk, S., Single CCII+ based all-pass filters, Int. J. of Electronics, 86 (1999), 947-959. [4] Çam, U., Cicekoglu, O., Gülsoy, M., Kuntman, H., New voltage and current mode first-order all-pass filters using single FTFN, Frequenz, 7-8 (2000), 177-179. [5] Higashimura M., Fukai, Y., Realization of all-pass and notch filters using a single current conveyor, Int. J. of Electronics, 65 (1988), 823-828. [6] Toker, A., Ozoguz, S., Cicekoglu, O., Acar, C., Current mode all-pass filters using current differencing buffered amplifier and new high-Q band-pass filter configuration, IEEE Transaction on Circuits and Systems-II, 47 (2000), 949- 954. [7] Sudhanshu, S., Iqbal, A.K., Novel first order allpass section using single CCIII, Int. J. Electronics, 88 (2001), 773-778. [8] Çam, U., A new transadmittance type first order allpass filter employing single third generation current conveyor , Analog Integ. Circuits and Signal Proces., 43 (2005), 97-99. [9] Wang, H. Y., Lee, C. T., Systematic synthesis R-L and C-D immitances using single CCIII, Electronic Letters, 88 (2000), 293-294. [10] Minai ,S., A new high performance CMOS third generation current conveyor (CCIII) and its application, Electrical Engineering, 85 (2003), 147-153. [11] Toker, A., Cicekoglu, O., Özcan, S., Kuntman, H., High output impedance transadmittance type continious-time multifunction filter with minimum active elements, International Journal of Electronics, 88 (2001), 1085-1091. [12] Soliman A. M., Awad, I. A., Fully differential CMOS current feedback operational amplifier, Analog Integ. Circuits and Signal Processing, 43 (2005), 61-62. [13] Haritantis, I., General method for designing RC harmonic oscillators, International Journal of Electronics, 58 (1985), 295-305.