Ehsan Azad
Myfyriwr ymchwil, Yr Ysgol Peirianneg
- azadem@cardiff.ac.uk
- Room C/3.10, Adeiladau'r Frenhines-Adeilad Canolog, 5 The Parade, Ffordd Casnewydd, Caerdydd, CF24 3AA
Mae'r cynnwys hwn ar gael yn Saesneg yn unig.
Trosolwg
I am a PhD research student at the Centre for High Frequency Engineering (CHFE), School of Engineering; under the supervision of Dr Roberto Quaglia, Dr James J. Bell, and Prof. Paul J. Tasker.
My research addresses the problems encountered in the field of non-linear RF and microwave power amplifier design. My research activities include design, modelling and characterisation of non-linear RF and microwave transistors and power amplifier circuits.
I have published several peer-reviewed scientific papers.
My peers and I participated in two High Efficiency Power Amplifier (HEPA) student design competitions. Our team won second place in the 2022 RWW/ARFTG MTT-S HEPA Student Design Competition, Las Vegas, USA; and the third place award in the 2021 IMS HEPA Student Design.
Ymchil
Diddordebau ymchwil
My PhD research project is in collaboration with Ampleon Netherlands B.V to design highly efficient power amplifiers capable of working at multiple DC supply voltages. The design is based on the state of the art Gallium Nitride (GaN) high electron mobility transistor (HEMT) devices for sub-6 GHz 5G base stations.
The Cardiff nonlinear behavioural model is a critical element in the design process as it allows us to directly use the nonlinear load-pull measurement data within the CAD simulator environment. Hence; increasing the chance of "first pass" successful design.
We have developed a new mathematical formulation for the Cardiff model which is capable to predict the device behaviour at various DC supply voltages. The result of this achievement has been published in several peer-reviewed scientific papers.
Dysgu
I have more than 250 hours of experience as a lab demonstrator and teaching assistant in both undergraduate and postgraduate ectrical and electronic enginieering Modules. The modules which I have participated in are listed as below:
- MSc: Microwave and Millimetre-Wave Integrated Circuit Design and Technology.
- MSc: RF circuit design & CAD.
- Year one: Electrical and electronic engineering lab.
- Year one: Analogue and digital communication systems.
- Year one: Matlab surgery.
- Year one: Electrical and Electronic Engineering 1.
Traethawd ymchwil
Efficiency Improvement in Base Station Power Amplifiers
Ffynhonnell ariannu
Ampleon Netherlands B.V.
Goruchwyliaeth
Dr Roberto Quaglia
Research Associate
Dr James Bell
Lecturer - Teaching and Research
Yr Athro Paul Tasker
Professor
Cyhoeddiadau
2022
- Azad, E. M., Quaglia, R., Chadhary, K., Bell, J. J. and Tasker, P. J. 2022. Cardiff model utilization for predicting the response of multiple-input power amplifiers. Presented at: Mediterrannean Microwave Symposium (MMS), Pizzo Calabro, Italy, 9-13 May 2022Proceedings of Microwave Mediterranean Symposium (MMS). IEEE, (10.1109/MMS55062.2022.9825516)
- Azad, E. M., Quaglia, R., Bell, J. J., Chaudhry, K., Nghiem, A., Sulaksono, K. and Tasker, P. J. 2022. Load-pull data analysis of a GaN on SiC HEMT targeting multi bias Doherty design. Presented at: International Workshop on Integrated Nonlinear Microwave and Millimeterwave Circuits, INMMIC, Cardiff, UK, 7-8 April 2022Proceedings of the 2022 International Workshop on Integrated Nonlinear Microwave and Millimetre-Wave Circuits. IEEE, (10.1109/INMMiC54248.2022.9762106)
- Baddeley, A., Azad, E., Quaglia, R., Bell, J. and Tasker, P. 2022. Gate bias voltage dependence of Cardiff admittance model in Ka-band GaAs pHEMTs. Presented at: IEEE Topical Conference on RF/Microwave Power Amplifiers for Radio and Wireless Applications (PAWR), Las Vegas, NV, USA, 16-19 January 20222022 IEEE Topical Conference on RF/Microwave Power Amplifiers for Radio and Wireless Applications (PAWR). IEEE pp. 8-10., (10.1109/PAWR53092.2022.9719858)
- Azad, E. M., Bell, J. J., Quaglia, R., Moreno Rubio, J. J. and Tasker, P. J. 2022. New formulation of Cardiff behavioral model including DC bias voltage dependence. IEEE Microwave and Wireless Components Letters (10.1109/LMWC.2022.3140653)
2021
- Alimohammadi, Y. et al. 2021. Incorporating gate-lag effects into the Cardiff Behavioural Model. Presented at: 50th European Microwave Conference (EuMC 2020), Utrecht, Netherlands, 12-14 January 20212020 50th European Microwave Conference (EuMC). IEEE pp. 684-687., (10.23919/EuMC48046.2021.9338185)
2020
- Azad, E. M., Bell, J. J., Quaglia, R., Moreno Rubio, J. J. and Tasker, P. J. 2020. Gate bias incorporation into Cardiff behavioural modelling formulation. Presented at: IEEE/MTT-S International Microwave Symposium (IMS 2020), Los Angeles, CA, USA, 4-6 August 20202020 IEEE/MTT-S International Microwave Symposium (IMS). IEEE pp. 420-423., (10.1109/IMS30576.2020.9223817)