## Prof. Dr. Cevdet Acar

**Prof. Dr. Cevdet ACAR**

**Professor of Circuits and Systems**

**Yeditepe University
Department of Electrical & Electronics Engineering
**

**acar@yeditepe.edu.tr**

**Education**

B.Sc. : Istanbul Technical University, Turkey, 1965

M.Sc. : Istanbul Technical University, Turkey, 1967

Ph.D. : Istanbul Technical University, Turkey, 1972

**Academic Titles**

1972: Assistant Professor

1977: Associate Professor

1988: Professor

**Academic Positions**

2000- : Professor, Yeditepe University.

1988-2000: Professor, Istanbul Technical University (İTÜ).

1977-1988: Associate Professor, Istanbul Technical University (İTÜ).

1972-1977: Assistant Professor, Istanbul Technical University (İTÜ).

1967-1972: Research Assistant , İTÜ

1984-1986: Visiting Associate Professor, University of California, Davis.

1974-1976: Postdoctoral, Wayne State University, Detroit.

**Administrative Positions**

2000- : Chairman, “Electrical and Electronics Engineering Dept.”, Yeditepe University.

1994-1998 : Head, “Circuits and Systems Division”, Istanbul Technical University.

**Awards**

1978: Scientific and Technological Research Council of Turkey (TÜBİTAK), Research Support Award

1973: TÜBİTAK Best Research Award

**Research Areas:**

Sensitivity and Tolerance Analysis

Statistical Sensitivity Measures

Signal-Flow Graphs

Return Differences and Feedback Concepts

Active Network Design

**Invention:**

### Current Differencing Buffered Amplifier (CDBA)

**Published Journal Papers (International)**

Ucak C., and Acar C., “Convergence and periodic solutions for the input impedance of a standard ladder network”, Europian Journal of Physics, V. 28, pp. 321-329, 2007.

Ali Ümit Keskin, Cemal Aydın, Erhan Hancıoğlu, Cevdet Acar, “Quadrature oscillators using Current Differencing Buffered Amplifiers”, Frequenz (Journal of RF-Engineering and Telecommunications), accepted for publication, 2006.

Keskin, A. Ü. Pazarcı, D., and Acar, C. “Comment on the Paradoxical behavior of an infinite ladder network of inductors and capacitors”, American Journal of Physics, Vol. 73, Issue 9, pp: 881-882, September 2005.

Acar C., Sedef H. “Realization of nth-order Current Transfer Function Using Current-Differencing Buffered Amplifiers”, International Journal of Electronics, V90, No. 4, pp. 277-283, 2003.

Ozoguz, S., Acar, C., Toker, A., and Gunes, E. O. “Derivation of low-sensitivity current mode CCII-based filters”, IEEE Proceedings- Circuits Devices and Systems, Vol. 148, Iss 3, pp. 115-120, 2001

Acar, C and Ozoguz, S. “Nth-order current transfer function sysnthesis using current differencing buffered amplifier: signal-flow graph approach”, Microelectronics J., vol. 31, pp. 49-53, 2000

Ozcan, S., Toker, A., Acar, C., Kutman, H., and Oguzhan, Ç. “Single resistance-controlled sinusoidal oscillators employing current differencing buffered amplifier”, Microelectronics J., vol. 31, pp. 169-174, 2000

Acar, C. and Ozoguz, S. “Nth-order voltage transfer function synthesis using a commercially available active component, CFA: signal-flow graph approach”, Frequenz, vol. 54, no. 5-6, pp. 134-137,2000

Acar, C. and Sedef, H. “On the realisation of voltage-mode filters function using CDBA” Frequenz, vol. 54, no. 9-10, pp. 198-202, 2000

Acar, C. and Sedef, H. “Nth-order lowpass current transfer function synthesis using CCII based unity gain current follower”, Frequenz-*International Journal of Telecommunication* vol. 54, no. 7-8, pp. 180-181, 2000.

Toker, A., Ozoguz, S. and Acar, C. “CDBA-based fully integrated gyrator circuit suitable for electronically tunable inductance simulation”, Int. J. Electron. Commun (AEU), vol. 54, no. 5, pp. 293-296, 2000

Acar, C. and Sedef, H. “A new floating FDNR circuit using differential voltage current conveyors”, *AEÜ-International Journal of Electronics and Communication* ,vol. 54, no. 5, pp. 297-301, 2000

Toker, A., Ozoguz, S., Çiçekoğlu, O., and Acar, C. “Current mode all-pass filters using current differencing filter configuration”, IEEE Transactions on Circuits and Systems, vol. 47, no. 9, pp. 949-954, September 2000.

Acar, C. and Ozoguz, S. “Nth-order voltage transfer function synthesis using a commercially available active component, CFA: signal-flow graph approach”, accepted for publication in Frequenz, Vol. 54, pp. 134 -137, 5-6 2000.

*Sedef H.**, and Acar C.: “On the Realization Of Voltage-Mode Filters Using CDBA”, Frequenz-International Journal of Telecommunication, Band 54, 9-10/2000, pp. 197-202.*

Sedef, H. and Acar, C. “A new floating inductor circuit using differential voltage current conveyors”, Frequenz, *International Journal of Telecommunication,* Vol.54, pp. 123 – 125, 5-6 2000.

Ozcan, S., Toker, A., Acar, C., Kuntman, H and Cıcekoglu, O. “Single resistance controlled sinusoidal oscillators employing current differencing buffered amplifier”, Microelectronics J., Vol. 31, pp. 169-174, 2000.

Acar, C. and Ozoguz, S. “Nth-order current transfer function synthesis using current differencing bufered amplifier: signal-flow graph approach”, Microelectronics J., Vol. 31, pp. 49-53, 2000.

Toker, A., Özoğuz, S. and Acar, C. “Current-mode KHN-equivalent biquad using CDBAs” , Electronics Letters, Vol. 35, No.20, pp. 1682-1683, 1999.

Ozoguz, S., Toker, A. and Acar, C. “Current-mode continuous-time fully-integrated universal filter using CDBAs”, Electron. Letters, Vol. 35, No. 2, pp. 97-98, 1999.

Ozoguz, S. and Acar C. “A new versatile building block: current differencing buffered amplifier suitable for analog signal-processing filters”, Microelectronics J., Vol. 30, No. 2, pp. 157-160, 1999.

Sedef, H., Acar, C., “Simulation of resistively terminated LC ladder filters using a new basic cell involving current conveyors”, Microelectronics Journal, Vol. 30, No. 1, pp. 63-68, 1999.

Acar C., and Kuntman, H. “Limitations on input signal level in voltage-mode active-RC filters using current conveyors”, Microelectronics Journal, Vol. 30, No. 1, pp. 69-76, 1999.

Cam., U., Kuntman, H. and Acar. C. “On the realization of OTA-C oscillators”, Int. J. Electron., Vol. 85, No. 3, pp. 313-326, 1998.

Ozoguz S. and Acar C., “On the realisation of floating immitance functions using current conveyors”, Int. J. Electronics, Vol. 85, No. 4, pp. 463-475, 1998.

Ozoguz, S. and Acar, C. “Single-input and three-output current-mode universal filter using a reduced number of active elements”, Electronics Letters, Vol. 34, No.7, pp. 605-606, April 1998.

Acar, C. “On the realization of current-mode filters using second-generation current conveyors”, International Journal of Circuit Theory and Applications, Vol.25, pp.229-233, 1997.

Ozoguz, S., and Acar, C. “Universal current-mode filter with reduced number of active and passive components”, Electronics Letters, Vol. 33, No.11, pp. 948-949, May 1997.

Acar, C.: “Nth-order voltage transfer function synthesis using a commercially available active component: Signal-flow graph approach”, Electronics Letters, Vol. 32, No.21, pp. 1933-1934, October 1996.

Acar, C., and Kuntman, H. “Limitations on input signal level in current-mode active-RC filters using CCIIs”, Electronics Letters, Vol. 32, No.16, pp. 1461-1462, August 1996.

Acar, C. “Nth-order allpass voltage transfer function synthesis using CCII+s: Signal-flow graph approach”, Electronics Letters, Vol. 32, No.8, pp. 727-729, April 1996.

Acar, C. “Nth-order lowpass voltage transfer functin synthesis using CCII+s: signal-flow graph approach”, Electronics Letters, Vol. 32, No.3, pp. 159-160, February 1996

Acar, C., and Ozoguz, S. “High-order voltage transfer function synthesis using CCII+ based unity gain current amplifiers”, Electronics Letters, Vol. 32, No.22, pp. 2030-2031, February 1996.

Acar, C., Ghausi, M.S. “Fully integrated active RC-filters using MOS and non-balanced structure”, International Journal of Circuit Theory and Appliations, Vol. 15, pp. 105-121, 1987.

Tan. M.A., Acar, C. and Ghausi, M.S. “Design of switched-capacitor filters using non-ideal op. amps.” Journal of the Franklin Institute, Vol. 323, No.1, pp. 52-72, 1987.

Tan, M.A., and Acar, C. “All-pole biquadratic filter realizition with the minimum ripple due to parameter variations”, International Journal of Circuit Theory and Applications, Vol. 12, No.4, pp. 329-335, October 1984.

Karagoz, C., and Acar, C., “Active switched-capacitor filter realization for a biquadratic voltage transfer function”, International Journal of Electronics, Vol.54, No.2, pp.211-220.

Acar, C. “Dependent and independent sensitivities in signal-flow graphs” Proc. of IEE, Vol.130, pt.G, No.3, June 1983.

Acar, C., and Tan, M.A. “Second-order active R filters with zero pole Q sensitivities due to gain-bandwidth products”, International Journal of Circuit Theory and Applications Vol.11, pp. 397-425, 1983.

Karagoz, C., and Acar, C. “Active switched-capacitor network realization for nth-order voltage transfer functions: a signal-flow graph approach”, International Journal of Circuit Theory and Applications, Vol.10, No. 4, pp.377-403, October 1982.

Tan, M.A. and Acar, C. “Sensitivity minimization in signal flow graphs”, International Jurnal of Circuit Theory and Applications, Vol. 10, pp. 19-25, January 1982.

Karagoz, C., and Acar, C. “Strays-insensitive switched-capacitor network realization for nth-order voltage transfer functions”, Electronics Letters, Vol. 18, No.22, pp. 966-967, October 1982.

Acar, C. “Critical element analysis for the transfer, gain and phase functions in linear active filters”, International Journal fo Circuit Theory and Applications, Vol.7, No.2, pp.201-208, April 1979.

Acar, C. “Statistical multiparameter sensitivity measures for transfer, gain and phase functions”, International Journal of Circuit Theory and Applications, Vol.7, No.2, pp.143-150, 1979.

Acar, C., Ghausi, M.S. and Laker, K.R. “Critical block analysis for the transfer, gain and phase functions in multipleloop feedback networks”, International Journal of Circuit Theory and applications, Vol. 6, No.2, pp. 89-104, 1978.

Acar, C. and Ozker, T. “Active-R-network realization for n th-order voltage transfer functions: a signal-flow graph approach”, AEÜ, Band 32, Heft 11, pp. 463-464, November 1978.

Acar, C. “Realisation of nth-order lowpass voltage transfer function by active R circuit: signal-flow graph approach” , Electronics Letters, Vol. 14, No.23, pp.729-730 November 1978.

Acar, C., Ghausi, M.S. “Design of high-order active filters in integrated circuits”, IEEE Journal of Solid-State Circuits, Vol. SC-13, No.2 pp.273-276, April 1978.

Acar, C., Ghausi, M.S. “Statistical multiparameter sensitivity measure of gain and phase functions”, International Journal of Circuit Theory and Applications, Vol.5, No.1, pp.13-22, January 1977.

Acar, C., Ghausi, M.S., and Laker, K.R. “Statistical multiparameter sensitivity measures in high Q networks”, Journal of the Franklin Institute , Vol.300, No.4, pp. 281-297, October 1975.

Acar, C. “Voltage transfer function synthesis using RLC-Ladder networks”, AEÜ, Band 29, Heft 6, pp. 265-269, June 1975.

Acar. C. “New return difference matrix” International Journal of Circuit Theory and Applications, Vol.3, No.1, pp.87-94, March 1975.

Acar, C. “On the evalution of sensitivity for graph transfer functions” AEÜ, Band 28, Heft 7/8, pp. 337-338, July/August 1974.

Acar, C. “Formulation of the sensitivity function using signal-flow graphs”, Proc. of IEE, Vol.121, No.2, pp.91-94, February 1974.

Acar, C. “Simple derivation of Chen’s multiple-node removal algorithm”, Electronics Letters, Vol.9, No.8/9, pp.186-187, May 1973.

Acar, C. “New active-RC-network realisation for nth-order transfer functions: signal-flow graph approach”, Proc. of IEE, Vol.120, No5, pp.557-55 9, May 1973

Acar, C. and Anday, F. “On the Analysis of active networks containing voltage, operational and differantial-input operational amplifiers”, Proc. of IEEE, Vol.60., No.1, pp.128-130, January 1972.

Acar, C. “New expansion for signal-flow graph determinant”, Electronics Letters, Vol.7, No.26, pp.766-767, December 1971.

Acar, C. “RLC-Ladder-Network synthesis: signal-flow graph approach”, Electronics Letters, Vol.7, No.19, pp.586-587, September 1971.

Acar, C. “New transformations in signal-flow graphs”, Electronics Letters, Vol.7, No.2, pp.27-28, January 1971.

Acar, C “Direct Formulation of the state equations: signal-flow graph approach in time domain”, Electronics Letters, Vol. 6, No.13, pp.395-39 7, June 1970.

Acar, C. “Formulation of the state equations by signal-flow graphs”, Electronics Letters,Vol.6, No.3, pp.82-84, February 1970.

Acar, C. “New return difference”, Electronics Letters, Vol.5 No.22, pp. 544, October,1969.

**Published Conference Papers (International)**

Deniz Pazarcı, Ali Ümit Keskin, Cevdet Acar, “On The Behavior of The Input Impedance of The Infinite Ladder Network”, ELECO 2005, 7-11 December 2005, Bursa.

Özoğuz, S., Acar, C. and Toker, A. “Transformation methods for reducing sensitivities of current-mode CCII-based filters” accepted for publication in ISCAS’2000, Geneva, Switzerland, 28-31 May, 2000.

Özoğuz, S., Toker, A., İbrahim, M. A. and Acar, C., “A new versatile building block: current differencing buffered amplifier and its applications”, Proc. of ECCTD’99, Vol. II, pp.90-93, Stresa, Italy, 29 Aug.-2 Sep. 1999.

Ozoguz S. and Acar. C, “On the current-mode current conveyor-based high-order filter realisations”, Proc. of ICECS, Lisbon, Portugal, 1998.

Ozoguz S., Tarim N., Acar C. and Kuntman H., “Novel voltage-mode universal filter based on a lossy inductance simulation”, Proc. of Melecon, pp. 595-599, Tel-Aviv, Israel, May, 1998.

Acar, C., and Ghausi M.S. “Fully integrated active filter design using MOS technology and non-balanced structure”, Proc. of the European Conference on Circuit Theory and Design, pp. 307-314, Paris, France, September, 1987.

Tan, M.A., and Acar, C. “All-pole biquadratic filter realization with minimum ripple due to parameter variations”, Proc. of the Fifth International Symposium on Network Theory, pp.141-146, Sarajevo, Yugoslavia, September 1984.

Acar. C., Anday, F., and Korürek, M. “Realization of Nth-order voltage transfer functions using only current differencing amplifiers and resistors”, Proc. of the Fifth International Symposium on Network Theory, pp. 445-4 49, Sarajevo, Yugoslavia, September 1984.

Acar, C., and Tan, M.A, “Second order active R filters with zero Q sensitivities due to gain-bandwidth products”, Proc. of the Sixth European Conference on Circuit Theory and Design, pp. 170-172, Stuttgart, Federal Republic of Germany, September, 1983.

Acar, C. “Determination of dependent and independent sensitivity fu nctions in signal-flow graphs”, Proc. of the 1981 European Conference on Circuit Theory and Design, pp.1039-1042, The Haugi, The Netherlands, August 1981.

Acar. C. “Active R filter realisation for the second order voltage transfer function: signal-flow graph approach”, Proc. of the Fourth International Symposium on Network Theory, pp.221-226 Ljubljyana, Yugoslavia, September 1979.

Chien, M.J., and Ghausi, M.S., and Acar, C. “Multiparameter multiport sensitivity measure”, Proc. of the 1978 IEEE International Symposium on Circuits and Systems, pp.1040-1045, New-York, NY, USA, May 1978.

Acar, C. “Critical element analysis for the transfer, gain and phase functions in linear active filters”, Proc. of the 1978 IEEE Internationa l Symposium on Circuits and Systems, pp.139-140, New-York, NY, USA, May 1978.

Acar, C., and Özker, T. “Active R network realization for nth-order voltage transfer functions: a signal-flow graph approach”, Proc. of the 1978 European Conference on Circuit Theory and Design, pp.73-77, Lousanne Switzerland, September 1978.

Acar, C., Ghausi, M.S. “Computer-Aided Design of high order active filters in integrated circuits”, Proc. of the International Conferences on Computer-Aided Design of Electronics, Microwave Circuits and Systems, pp. 134 University of Hull, Hull, England, July 1977.

Acar, C.,Ghausi, M.S. and Laker. K.R. “Critical block analysis for the transfer, gain and phase functions in multipleloop feedback networks”, Proc. of the 19th Midwest Symposium on Circuits and Systems, University of Wisconsin-Milwaukee, pp. 209-211, USA, August 1976.

Acar, C. “Statistical multiparameter sensitivity measures for transfer, gain and phase functions”, Proc. of the 14th Allerton Conference on Circuit and System Theory, pp. 587-596, Allerton House, Monticello, Illinois, October 1976.

Acar, C. and Ghausi, M.S. “Statistical multiparameter sentsitivity measure of gain and phase functions”, Proc. of the 3rd International Symposium on Network Theory, pp.169-183 Siplit, Yugoslavia, September 1975.

**Published Journal Papers (National)**

Cevat, E., Toker, A., and Acar, C. “Ota-C based proportional-integral-derivative (PID) controller and calculating optimum parameter tolerances”, Turkish Journal of Electrical engineering and Computer Sciences, vol. 9., no. 2, pp. 189-198, 2001.

Cevat, E., Toker, A., and Acar, C. “A new proportional-integral-derivative (PID) controller realization by using current conveyors and calculating optimum parameter tolerances”, Istanbul University Engineering Faculty Journal of Electrical and Electronics, vol. 1, no. 2, pp. 267-273, 2001

Acar, C., Eriş. E. ve Yanıkoğlu, Y. “Haberleşme Sistemlerinde kullanılan LC filtrelerinde self elemanlarına ilişkin Q değerlerinin belirlenmesi”, TUBİTAK Doğa Bilim Dergisi, Cilt 7, Sayı 1, Sayfa 1-5, Ankara 1983.

Acar, C., Anday, F., ve Korürek, M. “Norton kuvvetlendiricilerle aktif R filtrelerinin Sentezi”, TÜBİTAK Doğa Bilim Dergisi, Cilt 3, Sayı 2, Sayfa 79-82, Ankara 1979.

Acar, C. “Frequency independent sensitivity measure”, Bulletin of the Technical University of İstanbul, Vol. 32, No.2, pp.117-125, İstanbul 1979.

Acar, C. “Realisation of the second-order active R filters: signal-flow graph approach”, Bulletin of the Technical University of İstanbul, Vol . 32, No.2, pp.126-138, İstanbul 1979.

Acar, C. “On the effect of external feedback”, Bulletin of the Technical University of Istanbul, Vol.22, No.2, pp.69-81, 1969.

**Published Conference Papers (National)**

Sedef, H., Acar, C., ve Alsan, S. “İkinci kuşak akım taşıyıcı kullanarak basamaklı türden LC-devrelerinin similasyonu”, Elek. Müh. 6. Ulusal Kongresi, Sayfa 1051-1055, Bursa, 11-17 Eylül, 1995.

Ozcan, S., Toker, A., Acar, C. ve Kutman, H. “Akım farkı alan tampon devreli kuvvetlendirici (CDBA) kullanarak sinüsoidal osilatörlerin gerçeklenmesi”, Elektrik-Elektronik ve Bilgisayar Mühendisliği 8. Ulusal Kongresi, sayfa: 49-51, Gaziantep, 6-12 Eylül 1999.

Özoğuz, S., Kutman, H., Bodur, S. ve Acar, C. “Gerilim izleyicili akım fark kuvvetlendiricisi (CDBA) için bir makromode”, ELECO”2000 Bursa, sayfa: 33-37, 8-12 Kasım 2000.

**Published Books**

Acar, C. “Elektrik Devrelerinin Analizi” (Electrical Circuit Analysis), Book, İTÜ Library, no. 1553, Istanbul 1995.

Acar, C. “Duyarlık ve Tolerans Analizi” (Sensitivity and Tolerance Analysis), Book, İTÜ Library, no. 1156, Istanbul 1979.

Acar, C. “Duyarlık Analizinde Yeni Olanaklar” (New Methods in Sensitivity Analysis), İTÜ Library, no. 1135, İstanbul 1979.

Acar, C. “İşaret Akış Diyagramları ile Devreler Teorisinde Yeni Olanaklar” (New Methods in Circuit Theory using Signal-Flow Graphs), PhD Thesis, İTÜ, Electrical Engineering Faculty, Istanbul 1972.

**Other Papers**

Cevat, E., Toker, A., and Acar, C. “A proportional-integral-derivative (PID) controller realisation by using current feedback amplifiers (CFAs) and calculating optimum parameter tolerances”, Pakistan Journal of Applied Sciences, vol. 1, no. 3, pp. 325-328, 2001.

**Projects**

Acar, C. ve Eriş, E. : ” Haberleşme sistemlerinde kullanılan LC filtrelerinde self elemanlarına ilişkin Q değerlerinin belirlenmesi “, Türkiye Bilimsel ve Teknik Araştırma Kurumu, Proje No: MAG-587, 1 Kasım 1981 – 1 Kasım 1982, ( Proje Yürütücüsü).** **

Acar, C. ve Anday, F. : ” Aktif R filtrelerinin sentezi “, Türkiye Bilimsel ve Teknik Araştırma Kurumu, Proje No: MAG-465, 1 Mayıs 1977- 1 Mayıs 1978, (ProjeYürütücüsü).

Acar, C. and Ghausi, M.S. : ” Low sensitivity RC active network design involving large variation in parameters “, National Science Foundation Unde r Grant ENG 75-10181 February 1, 1975 – July 31, 1977, (Research Associate).

Acar, C. ve Özker, T. : ” İşaret-akış grafları ile devre sentezinin esasları “, Türkiye Bilimsel ve Teknik Araştırma Kurumu, Proje no: MAG-213, 1 Aralık 1969 – 1 Aralık1970, (Yardımcı Araştırmacı).