A linear group delay filter with tunable positive slope for analog signal processing

Emilie Avignon-Meseldzija (1) , Jelena Anastasov (2) , Dejan N Milic (2)

1 GeePs - Laboratoire Génie électrique et électronique de Paris
2 Faculty of Electronic Engineering [University of Niš]

This article describes the design of a tunable positive slope linear group delay filter dedicated to analog signal processing applications. The designed filter is composed of eight second-order all-pass cells which have been optimized to obtain a highly linear global group delay characteristic over a specified bandwidth for a specified dispersion. Each of these second-order cell is designed with a dedicated − topology to fit the ideal group delay characteristic with a high efficiency. Based on the sensitivity analysis of the topology the possibility of tuning the group delay slope is highlighted. The design is achieved at transistor level with the ST CMOS 55nm technology and has a maximum bandwidth of 3 GHz, a maximum reachable delay of 4.45 ns, and a group delay swing of 3 ns. The positive slope of the group delay can be tuned in the range from 1.2 ns/GHz up to 1.4 ns/GHz.

Mots clés: dispersive filter; phaser; analog signal processing; group delay

Domaines: Micro et nanotechnologies/Microélectronique

Emilie Avignon-Meseldzija, Jelena Anastasov, Dejan N Milic. A linear group delay filter with tunable positive slope for analog signal processing. International Journal of Circuit Theory and Applications, 2021, 49 (5), pp.1307-1326. ⟨10.1002/cta.2995⟩. ⟨hal-03578796⟩