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Circuit theory of LPHP-NGD composite for inductor less BP-NGD circuit by Dr. Blaise Ravelo on Aug. 26, 2021

Date: July 26th, 2021


“Circuit theory of LPHP-NGD composite for inductor less BP-NGD circuit”


Dr. Blaise Ravelo, Nanjing University of Information Science & Technology, School of Electronic & Information Engineering Nanjing, China 210044

Event Organized By:

Circuits and Systems Society (CASS) of the IEEE Santa Clara Valley Section



6:30 – 7:00 PM Networking/Intro 7:00 – 7:50 PM Lecture7:50 – 8:00 PM Q&A/Adjourn



This research work webinar introduces an original innovative theory not familiar to most of Circuit-And-System (CAS) engineers. The original circuit theory is focused on inductor less negative group delay (NGD) topology. The considered passive cell comprised of resistor and capacitor elements without inductor operates as a bandpass (BP) NGD function. The particular specifications of NGD functions are defined. The BP-NGD fully lumped circuits generally available in the literature operate with resonant RLC-network. For the introduction, a lumped circuit was first time identified to exhibit the BP-NGD behavior without the presence of inductive component. The inductor less BP-NGD topology is inspired from the combination of low-pass (LP) and high-pass (HP) NGD passive cells. Therefore, an original LPHP-NGD composite topology is obtained. The identified BP-NGD topology is constituted only by passive RC-networks. Then, theoretical development of BP-NGD analysis is explored. The inductor less circuit theory starts with the identification of BP-NGD canonical form. Then, the expressions of NGD value, center frequency and attenuation in function of RC-network parameters are established. The BP-NGD synthesis equations allowing to determine the resistor and capacitor elements are derived. Proofs-of-concept are designed and prototypes are fabricated to verify the effectiveness of the developed LPHP-NGD composite theory. To validate the developed original circuit theory, two prototypes of RC-network based LPHP-NGD composite were designed, fabricated, simulated and tested. The two prototypes were synthesized with respect to two different NGD center frequencies 13.5 MHz and 22 MHz. As expected, the calculated, simulated and measurement results are in very good agreement with NGD value of about some negative nanoseconds. In the future, the characterized inductor less topology enable to overcome the traditional limitations of RLC-network based BP-NGD circuits because of inductance self-effect limitation.


Dr. Ravelo (Google scholar h-index(2021)=23 and i-index(2021)=64) is a full professor at NUIST & researcher in Multiphysics and electronics engineering. He is a pioneer of the negative group delay (NGD) concept about negative-time signal travelling physical space. He was research director of 11 PhD students (8 defended), postdocs, research engineers and Master internships. He is ranked in Top 2% world’s scientists based on year 2019 by Stanford University, US. With European, Asian, American and African partners, he is actively involved and contributes on several international research projects. He is member of IET Electronics Letters editorial board as circuit & system subject editor. He is (co-)authors of more than 350 scientific research papers in new technologies published in int. conf. and journals. He is lecturer on circuit & system theory, STEM (science, technology, engineering, and math) and applied physics.

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Topic: Amit Jha’s Zoom Meeting

Time: Aug 26, 2021 06:30 PM Pacific Time (US and Canada)


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Meeting ID: 817 1962 5637

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Admission Fee:

All admissions free. Suggested donations:

Non-IEEE:  $5, Students (non-IEEE): $3, IEEE Members (not members of CASS or SSCS): $3

		Circuit theory of LPHP-NGD composite for inductorless BP-NGD circuit design image

  • July 2021
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