Design Method for Negative Group Delay Circuits Based on Relations among Signal Attenuation, Group Delay, and Bandwidth

• Main Authors: Sehun Na, Youn-Kwon Jung, Bomson Lee
• Format: Article
• Language: English
• Published: The Korean Institute of Electromagnetic Engineering and Science 2019-01-01
• Series: Journal of the Korean Institute of Electromagnetic Engineering and Science
• Subjects: Bandwidth; Negative Group Delay; Passive Element; Signal Attenuation; Synthesis
• Online Access: http://www.jees.kr/upload/pdf/jees-2019-19-1-56.pdf

Typical negative group delay circuits (NGDC) are analyzed in terms of signal attenuation, group delay, and bandwidth using S-parameters. By inverting these formulations, we derive and present the design equations (for NGD circuit elements) for a desired specification of the two among the three parameters. The proposed design method is validated through simulation examples for narrow- and wide-band pulse inputs in the time and frequency domains. Moreover, an NGDC composed of lumped elements is fabricated at 1 GHz for measurement. As a function of frequency, the circuit-/EM-simulated and measured group delays are in good agreement. The provided simple NGDC design equations may be useful for many applications that require compensations of some signal delays.