Giovanni Collodi

Biography

1 - TRAINING   1996 Graduates in Electronic Engineering at the University of Florence "Mesfet Model for Large Signals Oriented to GaAs MMIC Design"   2001 PhD Degree "Interactive Resonant Quantum Devices: Circuit Models and MMIC Applications"   2. - POST DOCTOR ACTIVITY 2001 Scholarship holder at Arcetri Astrophysical Observatory   2002 Temporary Research Fellow at Arcetri Astrophysical Observatory "Digital Technologies for the Treatment of Radio Astronomy Signs".   2003 Temporary Research Fellow at Arcetri Astrophysical Observatory "Digital Technologies for the Treatment of Radio Astronomy Signs".   2004 Temporary Research Fellow at the Department of Electronics and Telecommunications at the University of Florence "Study and Implement a Multi-Hop Wireless Communications System for a Sensor Network".   3. - CURRENT POSITION   2005 Research Fellow ING-INF / 01 at the Faculty of Engineering of the University of Florence (ING-INF / 01).

Research Interest

The original scientific activity aimed at the development of innovative synthesis methods for the design of multi-functional MMIC circuits and the study of CAD models affords, starting from 2003 and until 2012, the interest in the research-oriented research and development of Systems Wireless, with particular reference to both hardware and software technologies and issues related to Wirelesss Sensor Network.  In particular, Dr. Collodi has been concerned with the following topics: Resonant Tunnel Effects and Microwave Applications The research has been designed to investigate how Heterojunction Intercept Tunneling FET (HITFET) and its potential are a primary element for the development of microwave integrated circuits for wireless applications. This activity was carried out within the research project called Quantum Microwave Monolithic Integrated Project (QMMIC project), conducted in collaboration with the Physics Sciences Research Laboratory, Motorola Labs, in Phoenix, USA. Microwave transistor models . The activity carried out in this field has led to the definition of a distributed model for microwave field effect transistor in which the passive component, which is described in equivalent terms by electromagnetic analysis techniques (carried out with the aid of commercial tools ), is used to connect a sequence of elementary active elements corresponding to as many sub-sections of the active region. The latter has been modeled analytically or empirically, according to the degree of accuracy and the maximum acceptable complexity. The derived three-dimensional model has allowed the designer to optimize circuit performance by directly acting on the geometries of the active devices that compose it. Experimental testing was carried out on device samples of different geometries and supplied by different foundries such as GEC-Marconi of Towcester (UK) and Philips Microwave Limeil of Grenoble (F), Motorola (USA). The work has provided interesting results for the definition of accurate circuit models both for linear and nonlinear and has allowed for high predictive capacity during the layout phase of the device itself. In the field of distributed models, work is evolving towards the integration of accurate thermal phenomena descriptions that can accurately predict the operation of high-power devices and power.  The results of this research activity concerned the development of new and more efficient CAD models, tools for global analysis of microwave integrated circuits, optimization of device structures through a rigorous interpretation of the physical phenomena involved in an electronic device. Microwave Integrated Circuits.  The most interesting results were the development of multifunctional MMICs made in GaAs technology for short distance radio links, MMIC for direct-capture receivers, high rejection and linearity mixers.  Within the aforementioned projects, the approach followed has always been to optimize performance by applying innovative synthesis methods and topological evolution. Dedicated digital analog interface: This activity was carried out in collaboration with the Arcetri Astrophysical Observatory and has been framed in the largest Atacama Large Millimeter Array (ALMA) project, aimed at the construction of a very wide bandwidth (up to 300 GHz) funded, at European level, by ESO. More specifically, this activity involved the study and design of fast samplers and custom demultiplexers specifically designed for the particular application type. The main issues related to the development of these components have been represented by the high clock rates, the required accuracy levels, the low power consumption associated with the high altitudes the system will have to work on. Embedded and Wirless Sensor Network Wireless Systems: This interest is witnessed by projects, both nationally and internationally, on related topics to which it is taking part.  The research carried out in this field, also related to the participation in the aforementioned projects, led Dr.Collodi to investigate the many issues related to the study, development, implementation and testing of Embedded Wireless Systems and WSN.