Dr. Gursel Duzenli
Electronic Engineer
About Me
28 /04/1970 (Hamburg, Germany)
Turk
Married, 3 Children
1976-1980 Primary School, Hamburg, Germany
1980-1986 High School, Hamburg, Germany
1986-1988 High School, Istanbul, Turkey
B.Sc.:
1989-1990 Karadeniz Technical University,
Faculty of Electrical and Electronics Engineering, Turkey
1990-1993 Istanbul Technical University,
Faculty of Engineering, Turkey
M.Sc.:
Improving the OTA's operation in subthreshold region and its medical applications
Operational Transconductance Amplifier (OTA) filters are mostly operating in strong inversion region. The frequency bands of EEG signals are so low that a large value of capacity elements are required. However, with our proposed OTA design operating in subthreshold region the capacity values are small and these gives us the possibility to integrated the filter in a chip.
We also designed a symmetrical CMOS OTA and symmetrical Cascade OTA that operate in subthreshold region with a 3V battery-power. Comparison of both the symmetrical CMOS OTA and Cascade OTA that operate with low-voltage and ± 5V were made.
Another OTA called "Anti Phase Common Source Pair" (ACSP) has been designed for subthreshold region operating. This ACSP OTA has been designed for improvement of the gm linearity. Also the dynamic range of the ACSP OTA is larger than the symmetrical OTA. ACSP OTA and Cascade ACSP OTA are compared with the other OTA's.
A simple and accurate macro model for symmetrical CMOS OTA has been proposed. The OTA characteristics are simulated by using this macro model and compared with the simulation results obtained by SPICE device level models. The results show that the proposed OTA macro model represents the symmetrical CMOS OTA approximately with the same accuracy of semiconductor SPICE device models, but with a significantly reduced computer time.
In order to test the proposed OTA and filter performances two different chips were fabricated with TÜBİTAK-YİTAL 3 micro technology. One of them includes three OTAs and the other includes four band-pass filters. Comparison of spice simulation results with experimental results are in excellent agreement.
1993-1996 Istanbul Technical University,
Faculty of Electrical and Electronics Engineering, Turkey
Ph.D.:
Development of MOSFET models suitable for simulation of analog CMOS circuits after hot-carrier stress
The focus of this study is the modeling of parameter degradation reliability of p-MOS and n-MOS transistors due to the hot-carriers under analog operation. A lot of efforts have been devoted to study the mechanisms due to the hot-carrier and modeling the device degradation due to these effects. However, these modelings are often performed on digital applications. Analog applications differ from digital ones by a number of points. Analog circuit reliability prediction has to take analog circuit design variables such as channel length, biasing conditions, and circuit topography into consideration. The proposed models combines the advantages of the parameter fitting method and the so-called delta Id model. The essence of the model is the translation of the physical mechanisms leading to degradation into the MOSFET model equations "suitable" place via an empirical description. Because of the "suitable" place of the empirical description in the MOSFET model equations the parameter extraction will be as simple as that of the so-called delta Id model. The empirical description was found from different degradations and fresh devices, so the accuracy is as high as that of the parameter fitting method. Another important feature of the proposed models is the prediction of the device lifetime at real life. This is an important feature because most of the developed degradation models are not able to predict the device lifetime. The proposed model includes a hot-carrier degradation model and a lifetime prediction model as a single model suitable for analog applications. The accuracy of the presented models has been verified with experimental data.
1996-2003 Istanbul Technical University,
Faculty of Electrical and Electronics Engineering, Turkey
Publications 
Projects
Cost effective and rapid blood cultures measurement system
SAU class attendance monitoring system with RFID
SAU building security automation system with RFID
Design, fabricating and optimization of a new-generation semi-active suspension system
Development of nanodevice MOSFET models suitable for simulation of analog CMOS circuits after hot-carrier stress
On the devolopment of models and algorithms for analysis and simulation of electric circuit elements used in our national industry (Turkey)
A 3D analysis and measurement system of force and the shape of punch in boxing
SAU restaurant automation system with RFID
Air leakage detection instrument
Development of MOSFET models suitable for simulation of analog CMOS circuits after hot-carrier stress
Control system for pre-paid electric, gas and water meters
Contactor rely life-time validation test system
Testing instruments for measuring human's physical activities
Improving the OTA's operation in subthreshold region and its medical applications
Get In Touch
Patent
Oğuz KARABAY, Gürsel Düzenli - A pressure-based method for measuring blood cultures. (2015/04/21) - TPE - 2015
Publications
Düzenli Gürsel (2015). A new security approach for public transport application against tag cloning with neural network-based pattern recognition. Neural Computing and Applications, 26(7), 1681-1691., DOI: 10.1007/s00521-015-1837-8.
Düzenli Gürsel (2015). RFID card security for public transportation applications based on a novel neural network analysis of cardholder behavior characteristics. Turkish Journal of Electrical Engineering and Computer Sciences, 23(4), 1098-1110., DOI: 10.3906/elk-1306-96.
Düzenli Gürsel, Karabay Oguz (2014). A new cost effective and rapid method for the measurement of blood cultures. Journal of the Faculty of Engineering and Architecture of Gazi University, 29(3), 617-624., DOI: 10.17341/gummfd.37710.
Düzenli Gürsel (2013). Improving the drain-current expression of BSIM4 for hot-carrier degradation modeling that is suitable for analog applications. Turkish Journal of Electrical Engineering and Computer Sciences, DOI: 10.3906/elk-1306-98.
Kocamaz Ugur, Düzenli Gürsel (2010). Improving the performance of quicksort algorithm by using a neural sorting network in small partitions. 7th International Symposium on Intelligent & Manufacturing Systems, 331-332.
Bozkurt Ferda, Düzenli Gürsel, Bozkurt Mehmet Recep, Yumusak Nejat (2004). Genetik algoritma yöntemini kullanarak yari iletken diyoda ait parametre çikarimi. Elektrik-Elektronik-Bilgisayar Müh. Sempozyumu, 284-288.
Yener Suayb, Düzenli Gürsel (2004). PSpice’a ait BJT modelinin gelistirilmesine yönelik yeni bir yöntem. Elektrik-Elektronik-Bilgisayar Müh. Sempozyumu, 148-152.
Düzenli Gürsel, Kuntman Hakan (2003). P-MOSFET’lerdeki sicak tasiyici yorulmalarinin modellenmesi. ITÜ Dergisi, 3(3), 31-36.
Düzenli Gürsel, Kuntman Hakan (2003). BSIM3v3.2 MOSFET modeline uygun sicak tasiyici modeli. 10. Elektrik-Elektronik-Bilgisayar Müh. Kongresi, 357-360.
Düzenli Gürsel, Kuntman Hakan (2002). The Basic of an Analytical Model Development for the PMOS Transistor Degradation. 8th International Conference on Optimization of Electrical and Electronic Equipment, 829-834.
Düzenli Gürsel, Kuntman Hakan (2002). A Study to Improve Symmetrical CMOS OTA Behaviour in Subthreshold Region. 8th International Conference on Optimization of Electrical and Electronic Equipment, 835-840.
Düzenli Gürsel, Kuntman Hakan (2002). A study to improve symmetrical CMOS OTA behaviour in subthreshold region. IU-Journal of Electrical & Electronics Engineering, 2(2), 527-535.
Düzenli Gürsel, Kuntman Hakan (2002). N-MOSFET’lerde sicak tasiyicilarin modellenmesi için yeni bir yöntem. Elektrik-Elektronik ve Bilgisayar Mühendisligi Sempozyumu, 99-103.
Düzenli Gürsel, Kuntman Hakan (2001). P-Mosfet'lerde Sicak Tasiyicilarin Modellenmesi Için Yeni Bir Yöntem. 9. Elektrik-Elektronik-Bilgisayar Müh. Kongresi, 355-358.
Kaçar Firat, Kuntman Ayten, Kuntman Hakan, Düzenli Gürsel (2000). MOSFET'lerde sicak tasiyicilarin esik gerilimine etkisinin modellenmesi için yeni bir yaklasim. Elektrik-Elektronik-Bilgisayar Müh. Sempozyumu, 53-57.
Düzenli Gürsel, Kilic Yavuz, Kuntman Hakan, Ataman Atilla (1999). On the design of low frequency filters using CMOS OTAs operating in the subthreshold region. Microelectronics Journal, 30(1), 45-54., DOI: 10.1016/S0026-2692(98)00084-6.
Düzenli Gürsel, Kuntman Hakan (1999). Düsük Güçlü, Düsük Besleme Gerilimli CMOS Simetrik OTA'nin Esikalti Çalismasinin Iyilestirilmesi. 8. Elektrik-Elektronik-Bilgisayar Müh. Kongresi.
Düzenli Gürsel, Kuntman Hakan (1998). Haberlesme cihazlari için düsük güçlü süzgeçler. V. Bilgisayar-Haberlesme Sempozyumu.
Düzenli Gürsel, Kuntman Hakan (1996). CMOS simetrik OTA'nin esikalti çalismasinin iyilestirilmesi. IX. Mühendislik Sempozyumu Elektronik ve Haberlesme Mühendisligi.