Electronics Engineering

INTRODUCTION: Examples of telecommunication and radar systems RF OSCILLATORS: resonant circuits, factors of merit and loss, examples of RLC networks around the resonance, the frequency stability coefficient, the quartz as a circuit element, phase noise.Reverse Oscillators: Colpitz, Clapp, Pierce and quartz oscillators.Negative resistance oscillators: maintenance conditions, triggering and stability of oscillations, dielectric resonator oscillators, ceramic resonator oscillators. RF AMPLIFIERS: stability, stability circles, Rollet factor, calculation of transduction gain, noise parameters, amplifiers for maximum gain: dimensioning starting from unconditionally stable transistors, implementation of matching networks with distributed or concentrated elements, dimensioning from conditionally stable transistors, dimensioning of stabilization networks. Low noise figure amplifiers.Power amplifiers, parameters and classes of amplifiers, dimensioning of class A power amplifiers project starting from non-linear models or load-pull measurements. RF FILTERS: Design of microwave filters with the low-pass prototype method of reference, realization in planar technology of low-pass filters RF MIXER: characteristic parameters of Mixer mixers with transistors: BJT, JFET. Diode mixer: non-linear model of the schottky diode, causes and patterns of noise in diodes, single diode mixer, balanced mixers. MODULATORS AND DEMODULATORS: Modulators and demodulators AM, SSB, of frequency.The PLL: operating principle, response to a phase and frequency error, stability, the design of a PLL. IF amplifier and gain control. CAD: Examples of Microwave Office CAD, of all the circuits described

Knowledge of electromagnetic fields and microwaves theory. Knowledge on electronic devices and on the main transistors circuits

Notes of the lessons downloadable from the teachers' website and from the classroom

Face-to-face teaching

oral exam on the theoretical topics of the course and project evaluation developed with the CAD Microwave Office

Pozar, “Microwave Engineering”, John Wiley & Son 1998. Collin, “Foundations for Microwave Engineering”Mc Graw Hill 1992 Roddy, “Microwave Technology”, Prentice-Hall 1986 Bahl, Bhartia, “Microwave Solid State Circuit Design”, John Wiley & Son 2001 Vendelin, Pavio, Rohde, “Microwave Circuit Design”, John Wiley & Son 1990. Sweet, “MIC & MMIC Amplifier and Oscillator Circuit Design”, Artech House 1990 Mass, “Microwave Mixers”, Artech House 1986 Gentili, “Microwave Amplifiers and Oscillators” North Oxford 1986 Rizzi, “Microwave Engineering-Passive Circuits”, Prentice-Hall 1988.

lectures and MWO CAD exercises in the classroom with laptop

Feedback oscillators, Barkhausen condition. Resonant networks, quality factor of a resonant network, stability coefficient. Passive components models, amplifiers with inductive polarization. Colpitts network, network transfer function and resonance frequency. Quality factor of the Colpitts network, input impedance. Review on static and dynamic load line for amplifiers with resistance and inductor, review on the temperature stabilization of an amplifier. Colpitts oscillator design, frequency stability. Wien oscillators and gain control. Quartz frequency stabilization. Pierce oscillator, working point choice, small signal model. LC oscillators. VCO with Colpitts network. VCO gain. Phase noise of oscillators, SSCR evaluation. The phase locked loop. PLL transfer function and stability. PLL Lock range. Analog multiplier with the Gilbert cell. The analog phase detector. The charge pump PLL and the PFD. Power amplifiers, compression point and 3rd- order intercept point. Class A, B, C power amplifiers. Design flow for power amplifier design. Load-pull techniques: Cripps Theory. Matching networks: properties and FoMs. L-C, T- and Pi- shape matching networks, Tapped networks with centre tap on the capacitive and inductive branch. Complex loads matching. RF-transformer and Transmission-line transformer matching networks. High- and Low- level amplitude modulators. SSB/SC, Phase and frequency modulators. Amplitude and SSB/SC demodulators. Phase and frequency demodulators. Lab exercises on: Colpitts oscillator, Quartz oscillator, power amplifiers.

Knowledge of electromagnetic fields and microwaves theory. Knowledge on electronic devices and on the main transistors circuits

Lecture notes. For further information we also recommend: H. L. Krauss and C. W. Bostian, Solid State Radio Engineering, http://www.csun.edu/~ih20409/SCHOOL1/Solid.State.Radio.Engineering(Krauss.1980).pdf

Lectures and CAD exercises

Face-to-face teaching

Two oral questions and a report on CAD exercise

Lectures and CAD exercises