Application of negative group delay active circuits to the design of broadband and constant phase shifters

Blaise Elysée Guy Ravelo (1) , Marc Le Roy (1) , André Pérennec (1)

1 Lab-STICC_UBO_MOM_DIM

The new phase-shifter configuration described in this report uses a negative group delay (NGD) active circuit. In this topology, a classical transmission line is set in cascade with an NGD circuit whose phase slopes are alike, but opposite, to get a constant and broadband phase shift. The proposed approach was validated through the design and measurement of a phase shifter, which exhibited a constant phase of 90° +- 5° over a 75% relative bandwidth around 1.6 GHz. Moreover, as the group delay of the NGD circuit compensated the transmission line one, the overall circuit group delay was kept to a small value in the operating frequency band.

Mots clés: phase shifters; negative group delay; active circuits

Domaines: Electronique

Blaise Elysée Guy Ravelo, Marc Le Roy, André Pérennec. Application of negative group delay active circuits to the design of broadband and constant phase shifters. Microwave and Optical Technology Letters, 2008, 50 (12), pp.3079-3081. ⟨10.1002/mop.23883⟩. ⟨hal-00468012⟩