Primjena digitalnog predizobličenja na RF pojačala snage u HCBT tehnologiji

master's thesis

• Title (english): Application of digital predistortion to RF power amplifiers in HCBT technology
• Author: Martin Berić
• Mentor: Marko Koričić (mentor)
• Committee member: Marko Koričić (predsjednik povjerenstva)
• Committee member: Tomislav Suligoj (član povjerenstva)
• Committee member: Goran Molnar (član povjerenstva)
• Granter: University of Zagreb; Faculty of Electrical Engineering and Computing; Zagreb
• Defense date and country: 2019-07-19, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Computing
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Electrical Engineering

Abstract

U ovom radu tehnika digitalnog predizobličenja signala primijenjena je na RF pojačalo
snage klase AB izvedeno u HCBT tehnologiji. Tehnika je izvedena korištenjem memorijskih
polinoma. Za potrebe rada napravljen je Salehov model pojačala. Model je korišten za razvoj
i testiranje tehnike digitalnog predizobličenja u Matlab-u kao i za generiranje
predizobličenog signala kojim je karakterizirano stvarno pojačalo. Napravljeno je mjerno
okruženje za testiranje linearnosti pojačala. Analiziran je utjecaj reda polinoma i dubine
memorije na spektralni odziv pojačala na širokopojasni 16-QAM signal. Uz širinu pojasa
1 MHz i 5. red polinoma postignuto je smanjenje spektralnog širenja od približno 10 dB.
Povećanjem širine pojasa signala, efikasnost tehnike se smanjuje zbog izraženijih
memorijskih efekata koji maskiraju djelotvornost linearizacije.

Abstract (english)

Technique of digitally predistorted signal was applied to AB class RF power amplifier
implemented in HCBT technology. Technique was derived by using memory polynomial.
For the purposes of this work Saleh amplifier model was made. Model was used for design
and testing of digital predistortion technique in MATLAB as well as for generating digitally
predistorted signal which was used for characterization of real amplifier. Measurement
system for testing amplifier linearity was setup. Impact of the polynomial order and depth
of memory on the amplifier spectral response on wideband 16-QAM signal were analyzed.
Decrease of spectral regrowth of 10 dB was acomplished using the fifth order polynomial
and 1 MHz signal bandwidth. By increasing the signal bandwidth, efficiency of the technique
decreases because more pronounced memory effects.

• Keywords: RF; pojačalo snage; HCBT; Saleh; izobličenje; digitalno predizobličenje; memorijski polinom
• Keywords (english): RF; power amplifier; HCBT; Saleh; distortion; digital predistortion; memory polynomial
• Language: croatian
• URN:NBN: urn:nbn:hr:168:302593
• Study programme: Title: Electrical Engineering and Information Technology; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka elektrotehnike i informacijske tehnologije (magistar/magistra inženjer/inženjerka elektrotehnike i informacijske tehnologije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Closed access
• Created on: 2020-01-07 16:44:31