A Novel All-Pass Network Implementation for Improved Group Delay Performance

In this letter, a novel all-pass network implementation is proposed using both distributed and lumped elements for high group delay. The implementation has reduced footprint and sensitivity of the group delay performance to the specified component value tolerances. It has been experimentally verified and the measured group delay is 2.4 ns at 1.85 GHz, which is thrice that reported in other approaches. The circuit finds varied applications in high resolution analog signal processing.