Paper Info
Title
Negative Group Delay Theory of a Four-Port RC-Network Feedback Operational Amplifier.
Abstract
An innovative negative group delay (NGD) theory based on a unity direct chain feedback (UDCF) circuit topology is developed in this paper. This NGD circuit is an active cell constituted by an operational amplifier in feedback with a four-port RC-network. This NGD circuit theory is developed based on the S-parameter model analytically established from the equivalent impedance matrix. The UDCF group delay frequency response is expressed as a function of the feedback RC-cell and the operational amplifier parameters. The NGD analysis of the developed UDCF cell is introduced. According to theoretical analysis, under a certain condition, the UDCF topology is susceptible to behave as a low-pass NGD function. The UDCF cell NGD characteristics are defined theoretically. The theoretical prediction is verified numerically and experimentally in both the frequency- and time-domain by designing and fabricating an active PCB prototype. The simulations and experimentations show that the UDCF circuit exhibits an NGD of approximately -38 ns with NGD cut-off frequency of about 5.5 MHz. More importantly, it is demonstrated in the time-domain that the low-pass NGD effect enables the UDCF cell to generate advanced output with sinc waveform input voltages.
Year
DOI
Venue
2019
10.1109/ACCESS.2019.2922422
IEEE ACCESS
Keywords
Field
DocType
Circuit theory,negative group delay (NGD),active topology,S-parameter modeling,time-domain demonstration,unit direct chain feedback (UDCF)
Topology,Frequency response,Computer science,Waveform,Group delay and phase delay,RC circuit,Network analysis,Operational amplifier,Distributed computing,Topology (electrical circuits),Equivalent impedance transforms
Journal
Volume
ISSN
Citations 
7
2169-3536
0
PageRank 
References 
Authors
0.34
0
7
Name
Order
Citations
PageRank
Fayu Wan124.14
Taocheng Gu200.34
b ravelo3108.79
B. Li423.37
Jing Cheng5252.55
Qingyun Yuan600.34
Junxiang Ge701.35