Design of a Compact Band‐Pass Negative Group Delay Circuit With Low Insersion Loss
Xinqi Guo, Aixia Yuan, Junzheng Liu, Niannan Chang, Enze Shi · Microwave and Optical Technology Letters · 2025
ABSTRACT In this letter, a compact circuit with band‐pass NGD function is proposed. The impact of each component on the overall performance of the circuit is analyzed, and the fundamental analytical approach for the band‐pass NGD circuit is introduced. Additionally, generating equations for key parameters of the NGD circuit are provided, including group delay, NGD bandwidth, and transmission coefficient. To further validate the feasibility of the band‐pass NGD circuit, the PCB was designed and fabricated; Measured results were compared with theoretical predictions and simulation outcomes. The analysis of underlying causes for the discrepancies between the measured result and the simulation outcome was carried out. A quantitative assessment of the parasitic parameters associated with each component was performed, and correction terms were introduced into the schematic diagram. At 0.25 GHz, the circuit achieves a group delay value of −3.86 ns while maintaining an insertion loss of only 2.21 dB. Due to its compact size and ease of integration, this proposed band‐pass NGD circuit holds significant potential for applications in signal delay correction within RF communication systems and electronic devices.