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Journal Article Stability Improvement of 60 GHz Narrowband Amplifier Using Microstrip Coupled Lines
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Authors
Woo Jin Chang, Jong Won Lim, Ho Kyun Ahn, Hong Gu Ji, Hae Choen Kim
Issue Date
2009-12
Citation
ETRI Journal, v.31, no.6, pp.741-748
ISSN
1225-6463
Publisher
한국전자통신연구원 (ETRI)
Language
English
Type
Journal Article
DOI
https://dx.doi.org/10.4218/etrij.09.1209.0012
Abstract
We present an analysis of microstrip coupled lines (MCLs) used to improve the stability of a 60 GHz narrowband amplifier. The circuit has a 4-stage structure implementing MCLs instead of metal-insulator-metal (MIM) capacitors for the unconditional stability of the amplifier and yield enhancement. The stability parameter, U, is used to compare the stability of MCLs with that of MIM capacitors. Experimental results show that MCLs are more stable than MIM capacitors with the same capacitances as MCLs because the parasitic parallel resistances of MCLs are lower than those of MIM capacitors. Moreover, the bandwidth of an amplifier using MCLs is narrower than one using MIM capacitors because the parasitic series inductances of MCLs are higher than those of MIM capacitors. Copyright © 2009 ETRI.
KSP Keywords
60 GHz, Microstrip Coupled Line, Stability parameter, Stage Structure, metal-insulator-metal (MIM) capacitor, stability improvement, unconditional stability, yield enhancement