Broadband Balun Using Active Negative Group Delay Circuit - Université de Bretagne Occidentale Access content directly
Conference Papers Year : 2007

Broadband Balun Using Active Negative Group Delay Circuit

Blaise Elysée Guy Ravelo
  • Function : Author
  • PersonId : 867782
André Pérennec
  • Function : Author
  • PersonId : 867783
Marc Le Roy
Connectez-vous pour contacter l'auteur


In this paper, a broadband balun using an active circuit with negative group delay (NGD) is proposed. The unit cell of the active NGD circuit is based on a Field Effect Transistor (FET) in cascade with an RLC series network. First, a comparison between measurements of a two-stage prototype of this active topology and simulations validate the synthesis method of this innovative device. Then, thanks to the NGD circuit, a constant phase can be generated if this circuit is associated with a classical transmission line. By implementing such phase shifters into the two branches of a resistive splitter, we obtain a new balun topology. The NGD balun simulation results show a rather constant differential output phase (180°±9°), insertion losses above -2.4 dB and an excellent isolation below -59 dB for all three ports, for a bandwidth from 3.5 GHz to 5.5 GHz.


Fichier principal
Vignette du fichier
euMc07_final_raveloM.pdf (391.25 Ko) Télécharger le fichier
Origin : Files produced by the author(s)

Dates and versions

hal-00468133 , version 1 (30-03-2010)



Blaise Elysée Guy Ravelo, André Pérennec, Marc Le Roy. Broadband Balun Using Active Negative Group Delay Circuit. 37th European Microwave Conference, Oct 2007, Munich, Germany. pp.466-469, ⟨10.1109/EUMC.2007.4405228⟩. ⟨hal-00468133⟩
82 View
407 Download



Gmail Facebook X LinkedIn More