A Novel Resonant-Type Tunable Group Delay Controller Based on Third-order Fully Tunable Topology

Qianyin Xiang, Xiangdi Wang, Mingye Fu and Quanyuan Feng 

ABSTRACT:  A novel resonant-type group delay controller based on third-order resonant topology with tunable central frequency and coupling coefficients is proposed. The coupling structure is realized by coupled line resonators loaded with two shunt capacitors for coupling coefficient tuning, and a series capacitor for resonant frequency tuning, then the group delay and working frequency can be tuned. The structure has the advantage of large range of tunable coupling coefficient, and breaks through the group delay tunable range of traditional delay circuits. The circuit is designed, simulated and measured. The measurement shows that the group delay can be tuned from 5 ns to 20 ns with a tunable central frequency in the range of 0.8 GHz~1.05 GHz, and minimum ±0.5 ns group delay bandwidth and -3dB magnitude bandwidth of 12 MHz.