Στη διπλωματική αυτή εργασία παρουσιάζεται η σχεδίαση και η υλοποίηση σε πλακέτα (PCB) ενός Wideband Low Noise Amplifier (LNA) με περιοχή λειτουργίας 2.7-6.3 GΗz και έλεγχο κέρδους (gain control). Ο ενισχυτής αυτός αποτελεί αναπόσπαστο κομμάτι ενός δέκτη υψηλών συχνοτήτων αφού αποτελεί το πρώτο στάδιο ενίσχυσης του σήματος εισόδου χωρίς να επιδεινώνει σημαντικά τον θόρυβο .
(EL)
In this diploma thesis, a Low Noise Amplifier from 2.7 to 6.3 GHz with gain control is designed. The Low Noise Amplifier (LNA) was designed using Avago's ATF-35143 PHEMT (GaAs) and simulations were performed in Keysight’s Advanced Design System (ADS). The electromagnetic simulations were performed using ADS’s EM tool Momentum. The LNA was implemented in a cascode topology, adopting current reuse technique. Based on these techniques, the LNA obtained high gain over 15 dB with gain variation of 0.5 dB from 3 to 6 GHz. The Noise Figure (NF) is lower than 1.4 dB and low power consumption is accomplished. For input and output matching a Chebyshev bandpass filter was used for achieving wideband performance. In addition, an output Source Follower was implemented for better matching (S11&S22<-12 dB).
(EL)
University of Patras
