Theoretical Analysis and Characterization of the Tunable Matching Networks in Low Noise Amplifiers


Yelten M. B. , Gard K. G.

European Conference on Circuit Theory Design, Antalya, Türkiye, 23 - 27 Ağustos 2009, ss.890-893 identifier identifier

  • Yayın Türü: Bildiri / Tam Metin Bildiri
  • Doi Numarası: 10.1109/ecctd.2009.5275128
  • Basıldığı Şehir: Antalya
  • Basıldığı Ülke: Türkiye
  • Sayfa Sayıları: ss.890-893

Özet

This paper provides the analytical background for the tunability in low noise amplifiers achieved by employing a pi-network where the series matching capacitor is assumed to be variable. The theoretical outcomes suggest that the choice of the tunable capacitor value will eventually result in a tradeoff between the noise figure (NF) and the input return ratio (S-11). By pursuing a minimized noise figure approach, equations relating the value of the tunable capacitor at different frequencies with circuit parameters are derived and confirmed by the simulation results. Finally, it is demonstrated that to accomplish the design targets for NF and S-11 over the tunable band, variable capacitors having quality factors greater than 10 should be utilized.