Dvostupanjsko niskošumno pojačalo s bipolarnim tranzistorima

master's thesis

• Title (english): Two-stage Low-noise Amplifier with Bipolar Transistors
• Author: Matej Štefanac
• Mentor: Tomislav Suligoj (mentor)
• Committee member: Tomislav Suligoj (predsjednik povjerenstva)
• Committee member: Igor Krois (član povjerenstva)
• Committee member: Marko Koričić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Electrical Engineering and Computing; Zagreb
• Defense date and country: 2022-07-12, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Electrical Engineering

Abstract

U radu je prikazan proces projektiranja kaskode prilagođene za rad na frekvencijama Globalnog navigacijskog satelitskog sustava (L-pojas). Opisane su prilagodne mreže pojačala, mreža za dovođenje istosmjernog napajanja te načini stabilizacije pojačala. Kaskoda je realizirana na tiskanoj pločici. Na njoj se provedena mjerenja istosmjernih napona, spektra na izlazu pojačala, snage na izlazu pojačala, faktora šuma i raspršnih parametara. Maksimalno pojačanje snage na nižem L-pojasu je 18dB, a na višem L-pojasu 12,4dB. Faktor šuma poprima vrijednosti u rasponu od 1,6dB do 2,1dB na nižem L-pojasu, a na višem pojasu poprima vrijednosti između 1,2dB do 1,33dB. U usporedbi s jednostupanjskim pojačalom kaskoda ima veće pojačanje snage uz sumjerljiv faktor šuma.

Abstract (english)

This thesis shows the designing process of cascode for application on Global navigation satellite system frequencies (L-band). Matching networks, DC bias networks, and stabilization methods are described. Cascode is realized on a printed circuit board. Performed measurements on a cascode are: DC measurement, output spectrum analysis, output power measurements, noise figure measurement, and scattering parameters measurement. Maximum power gain is 18dB on a lower L-band and 12,4dB on a higher L-band. Noise figure has values in range 1.6dB to 2.1dB on a lower band and 1.2dB to 1.33dB on a higher band. In comparison with the one-stage amplifier with simialr collector current, cascode has a higher gain and comparable noise figure.

• Keywords: niskošumno pojačalo; faktor šuma; bipolarni tranzistor; HCBT; GNSS
• Keywords (english): low-noise amplifier; noise figure; bipolar transistor; HCBT; GNSS
• Language: croatian
• URN:NBN: urn:nbn:hr:168:496764
• 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: 2023-01-14 21:49:15