Κατεύθυνση Σχεδίασης Ολοκληρωμένων Κυκλωμάτων
Πληροφορική

2020-03-17

2020

Georgiou Polyxeni

Ευαγγέλια Καράγιαννη, Δρ. Ηλεκτρολόγος Μηχανικός ΕΜΠ, Αναπληρώτρια Καθηγήτρια ΣΝΔ

Σχεδίαση ενισχυτών υψηλής ισχύος άνω της X band με χρήση πρωτότυπων ασταθών και αμφίδρομων τρανζίστορ GaN

English
Greek

Design of high-power amplifiers using non-unilateral and unstable original GaN transistors over the X band

In this thesis, the design of high power amplifiers (HPAs) for extremely high frequencies (X-band, V-band) is studied. The circuit simulation was performed with the ADS simulation tool by Keysight. High power amplifiers are an essential structural part of the transmitters, as they are responsible for amplifying the transmitted signal. The large number of electronic applications (such as WiMax, 5G) that already exist nowadays, demands the use of even higher band frequencies, as lower bands are fully occupied. Therefore, the growth of new generation transistors based on GaN technology, lead to the design and implementation of innovative HPAs with satisfactory performance. In the next chapters, we will discuss the differences between GaN technology, the earlier GaAs technology, and how high mobility transistors (HEMT) work. In addition to this, we provide a comparison of small and large signal models, so that the transistor scattering parameters can be used correctly. Furthermore, we present the amplifier as a two-port network and analyze the factors that affect its reliability and use in each application. Such factors are the unilateral state, the stability and the performance of the amplifier. The main part of this thesis is presented in the fourth chapter, which includes the design of two amplifiers: the first one at the frequency of 58.5 GHz using a commercial type transistor and the second one at the frequency of 10GHz using original transistors manufactured in Greece. Finally, we present the design and customisation of devices with different resistivity topologies, so as to improve stability, and the design of bilateral networks that meet the high performance requirements of applications. The ultimate goal of the thesis is to identify the values of passive elements needed for optimal design, in order to begin their three-dimensional design.

Radar, Transmitter, Power Amplifier, Amplifier Performance, Mathcing Networks, Polarization Circuits, Stability, Unilateral, Feedback

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https://pergamos.lib.uoa.gr/uoa/dl/object/2899351