VECTOR ANALYZER OF ELECTRONIC CIRCUITS

V magistrskem delu je predstavljen vektorski analizator elektronskih vezij (ang. vector network analyzer oz. VNA). Opisane so vrste, lastnosti in zmogljivosti modernih analizatorjev elektronskih vezij. Glavni cilj dela je bila izdelava nizkocenovnega VNA, ki bi bil primeren za uporabo v laboratoriju, in bi omogočal merjenje sipalnih parametrov, s katerimi opišemo lastnosti linearnih elektronskih vezij in gradnikov. Delovno frekvenčno področje instrumenta znaša od 100MHz do 1GHz. Zasnovali smo ga v obliki periferne naprave na univerzalnem serijskem vodilu, ki se jo krmili s pomočjo ustreznega grafičnega vmesnika na osebnem računalniku. Tiskana vezja smo načrtali s pomočjo programskega paketa Altium Designer 10. Za simulacijo analognega dela vezja smo uporabili simulacijski program Multisim 9, posebej za visokofrekvenčni del vezja pa še AWR Microwave Office 11. Grafični uporabniški vmesnik smo izdelali v programskem razvojnem okolju Microsoft Visual Studio 2010 in je napisan v programskem jeziku Visual C#. Vgrajena programska oprema za mikrokrmilnik je bila zasnovana v razvojnem okolju Atmel Studio 6.2tokrat smo uporabili programski jezik C.The following thesis presents the vector network analyzer or VNA. Explained are the types, properties and performance of modern network analyzers. The main aim of the thesis was to design a low-cost VNA which should be suitable for laboratory use and enable the measurement of the scattering parameters which are used to describe the properties of linear electronic circuits and components. Operational frequency range of the instrument spans from 100.0 MHz to 1.0 GHz. It was designed as a universal serial bus peripheral device, controlled by a corresponding graphical user interface on a personal computer. The printed circuit boards were designed using the software package Altium Designer 10. To simulate the analogue part of the circuit we used the simulation program Multisim 9 and for the high-frequency part of the circuit AWR Microwave Office 11. The graphical user interface was developed in the programming development environment Microsoft Visual Studio 2010 and is written in the programming language Visual C #. The firmware for the microcontroller was designed in the development environment Atmel Studio 6.2this time we used the programming language C