K-Band HBT and HEMT Monolithic Active Phase Shifters Using Vector Sum Method
Journal
IEEE Transactions on Microwave Theory and Techniques
Journal Volume
52
Journal Issue
5
Pages
1414-1424
Date Issued
2004-05
Date
2004-05
Author(s)
DOI
246246/200611150121329
Abstract
Two monolithic 3-bit active phase shifters using the
vector sum method to -band frequencies are reported in this
paper. They are separately implemented using commercial 6-in
GaAs HBT and high electron-mobility transistor (HEMT) monolithic-
microwave integrated-circuit (MMIC) foundry processes.
The MMIC HBT active phase shifter demonstrates an average
gain of 8.87 dB and a maximum phase error of 11 at 18 GHz,
while the HEMT phase shifter has 3.85-dB average measured
gain with 11 maximum phase error at 20 GHz. The 20-GHz
operation frequency of this HEMT MMIC is the highest among all
the reported active phase shifters. The analysis for gain deviation
and phase error of the active phase shifter using the vector sum
method due to the individual variable gain amplifiers is also
presented. The theoretical analysis can predict the measured
minimum root-mean-square phase error 4.7 within 1 accuracy.
Subjects
Active phase shifter
HBT
high electron-mobility
transistor (HEMT)
transistor (HEMT)
-band
monolithic microwave integrated
circuit (MMIC)
circuit (MMIC)
vector sum method
Publisher
Taipei:National Taiwan University Dept Chem Engn
Type
journal article
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