Hakan KUNTMAN, Muhammed Abdulbaki İBRAHİM

Düşük-giriş yüksek-çıkış empedanslı yeni bir akım-modlu KHN-süzgeci

Bu çalışmada, yeni bir ikinci dereceden akım-modlu Kerwin-Huelsman-Newcomb (KHN) süzgeci önerilmiştir. Önerilen devre, üç diferansiyel gerilim akım taşıyıcı (DVCC), iki kapasitör ve üç direnç kullanmaktadır. Devre, yüksek geçiren (YG), bant geçiren (BG) ve alçak geçiren (AG) 'den oluşan üç temel süzgeç fonksiyonunu eş zamanda üretmektedir. Tümgeçiren (TG) ve bant söndüren (BS) süzgeç fonksiyonları uygun süzgeç çıkış işaretleri doğrudan bağlanarak elde edilebilir. Giriş işareti düşük empedanslı düğüme bağlandığından ve tüm çıkış işaretleri yüksek empedanslı düğümlerden alındığından dolayı önerilen devre akım-modlu çalışmalarda artarda bağlanma açısından yarar sağlamaktadır.

A new low-input high-output impedance current-mode KHN-filter

The well-known Kerwin-Huelsman-Newcomb biquad, or KHN-biquad, is a filter circuit that consists of two integrator and a summer circuits. Based on the active elements used in the integrator and summer circuits, several KHN-biquads have been presented in the literature. In this paper, a current-mode (CM) KHN-biquad is proposed. The circuit employs three differential voltage current conveyors (DVCCs) as active elements together with two capacitors and three resistors as passive elements. Tracking error effect and sensitivity analyses of the circuit are performed. SPICE simulation results are given to verify the prediction's. It is seen that the circuit enjoys the following advantages: a) providing the basic three filter functions (BP, HP and LP) simultaneously, b) realizing the notch and allpass functions by connecting appropriate output currents directly without using additional active or passive elements, c) low input impedance and high output impedances, which is important for cascade connections in current-mode operations, d) use of only grounded passive elements, which is attractive in integrated circuit implementation, e) control of the quality factor Q without disturbing the parameter $omega_0$ of the filter and f) low active and passive sensitivities. The grounded resistors of the circuit are realized using electronic resistors of which each constructed with two MOS transistors.

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1.Altuntas, E. and Toker, A., (2002). Realization of voltage and current mode KHN biquads using CCCIIs, AEÜ International Journal of Electronics and Communication, 56, 45 - 49.
2.Chang, C. M. and Lee, M. J., (1999). Voltage-mode multifunction filter with single input and three outputs using two compound current conveyors, IEEE Transactions on Circuits and Systems I Fundamental Theory and Applications, 46, 1364− 1365.
3.Cicekoglu, O., (2001). Current-mode biquad with a minimum number of passive elements, IEEE Transactions on Circuits and Systems II: Analog and Digital Signal Processing, 48, 221 − 222.
4.Elwan, H. O., and Soliman, A. M., (1996). A novel CMOS current conveyor realization with an electronically tunable current mode filter suitable for VLSI, IEEE Transactions on Circuits and Systems II: Analog and Digital Signal Processing, 41, 663 - 670.
5.Elwan, H. O. and Soliman, A. M., (1997). Novel CMOS differential voltage current conveyor and its applications, IEE Proceedings of Circuits Devices and Systems, 144, 195 - 200.
6.Ibrahim. M. A., Minaei, S. ve Kuntman, H., (2003). DVCC elemanı ile gerçekleştirilen yeni bir akım modlu KHN-süzgeçi", 11. Sinyal İşleme ve İletişim Uygulamaları Kurultayı, Koç Üniversitesi, 211 – 214, İstanbul.
7.Kerwin, W., Huelsman, L. and Newcomb, R., (1967). State variable synthesis for insensitive integrated circuit transfer functions, IEEE Journal of Solid-State Circuits, SC-2, 87 - 92.
8.Khaled, N. S. and Soliman, A. M., (2000). Voltage mode Kerwin-Huelsman-Newcomb circuit using CDBAs, Frequenz, 54, 90 - 93.
9.Senani, R. and Singh, V. K., (1995). KHNequivalent biquad using current conveyors, Electronics Letters, 31, 626 - 628.
10.Soliman, A. M., (1994). Kerwin-Huelsman- Newcomb circuit using current conveyors, Electronics Letters, 30, 2019 - 2020.
11.Toker, A., Ozoguz, S. and Acar, C., (1999). Currentmode KHN-equivalent biquad using CDBAs, Electronics Letters, 35, 1682 - 1683.
12.Toumazou, C., Lidjey, F., Haigh, D., (1990). Analog IC Design: The Current-Mode Approach, Peter Peregrinus, Exeter, UK.
13.Wang, H. Y., and Lee, C. T., (2001). Versatile insensitive current-mode universal biquad implementation using current conveyors, IEEE Transactions on Circuits and Systems II: Analog and Digital Signal Processing, 48, 409 − 413.
14.Wang, Z., (1990). 2-MOSFET transistors with extremely low distortion for output reaching supply voltage, Electronics Letters, 26, 951-952.