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Journal Article
Stability Improvement of 60 GHz Narrowband Amplifier Using Microstrip Coupled Lines
- 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
- 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