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Broadband Balun Using Active Negative Group Delay Circuit

Blaise Ravelo 1 André Pérennec 1 Marc Le Roy 1, *
* Corresponding author
Lab-STICC - Laboratoire des sciences et techniques de l'information, de la communication et de la connaissance, UBO - Université de Brest
Abstract : 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.
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Blaise 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⟩



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