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Uporaba frekvenčnega diskriminatorja z optično kasnilno linijo za merjenje faznega šuma
LAVRIČ, ANDREJ (Author), Batagelj, Boštjan (Mentor) More about this mentor... This link opens in a new window

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Abstract
Delo naslavlja merjenje faznega šuma elektronskega oscilatorja s pomočjo optoelektronskih merilnih pristopov. V prvem delu je predstavljena formulacija spektralnih veličin za opis šuma. Sledi izpeljava Leesonove enačbe faznega šuma, ki oscilator obravnava kot linearni časovno invariantni sistem. Naslednje poglavje je namenjeno pregledu metod za merjenje faznega šuma. Kratko so opisane direktna metoda, metoda faznega detektorja in metoda dvokanalne križne korelacije. Metodi frekvenčnega diskriminatorja je posvečeno svoje poglavje, v katerem je predstavljena prenosna funkcija splošnega frekvenčnega diskriminatorja. Obravnavane so različne realizacije kasnilnega elementa. Postopoma je sestavljen sistem frekvenčnega diskriminatorja z optično kasnilno linijo. V drugem delu so predstavljene izdelane komponente merilnega sistema, ki zajemajo optični sprejemnik, ojačevalnike, sita in mešalnike. Sledi postavitev merilnega sistema, opis umerjanja in izvedba meritve faznega šuma. Meritev je izvedena na treh izvorih signala pri frekvenci 10,5 GHz. Dobljeni rezultati so ponovljivi za različne postavitve sistema in se ujemajo z meritvijo faznega šuma po direktni metodi. Na koncu so predstavljene možne izboljšave sistema.

Language:Slovenian
Keywords:fazni šum, Leesonova enačba, merjenje faznega šuma, direktna metoda, metoda faznega detektorja, metoda frekvenčnega diskriminatorja, optična kasnilna linija
Work type:Master's thesis/paper (mb22)
Organization:FE - Faculty of Electrical Engineering
Year:2019
Views:531
Downloads:221
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Secondary language

Language:English
Title:Phase-noise measurement using a frequency discriminator with an optical delay line
Abstract:
This study was a phase-noise measurement of an electronic oscillator employing optoelectronic measuring approaches. In the first part, a formulation of tne spectral quantities of the noise are presented. A derivation of Leeson's equation for phase noise follows, where the oscillator is treated as a linear time-invariant system. The next section is dedicated to an overview of the methods for phase-noise measurements. The direct method, the phase-detector method and dual-channel cross-correlation method are briefly described. A separate section is dedicated to the frequency-discriminator method in which the transfer function of a generic frequency discriminator is presented. Different implementations of the delay element are treated. A frequency discriminator with an optical delay line is gradually developed. In the second part, fabricated components of the measuring system are presented. These include an optical receiver, amplifiers, filters and mixers. A presentation of the measuring system follows,with a description of the calibration and the measurement of phase noise. The measurement is performed on three different signal sources at a frequency 10.5 GHz. The obtained results are reproducible for different variations of the measurement setup and they agree with the results obtained using the direct method. Finally, a few potential improvements to the setup are presented.

Keywords:phase noise, Leeson's equation, phase-noise measurement, direct method, phase-detector method, frequency-discriminator method, optical delay line

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