A new CFOA-based negative group delay cascadable circuit

Abuelma’atti, Muhammad Taher; Khalifa, Zainulabideen Jamal

doi:10.1007/s10470-018-1172-y

Cited by 20 publications

(15 citation statements)

References 18 publications

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“…Table 5 addresses the Comparison of Center Frequencies, NGD Bandwidths and Magnitudes of Different BP NGD Lumped Circuits Available in the Literature (Mao et al, 2019;Ravelo, 2014Ravelo, , 2017Vauché et al, 2021;Abuelma'atti & Khalifa, 2018;Meng et al, 2018;Wan, Ji and Ravelo, 2019) and the Present Study. The NGD Circuits are Either Passive and Active Type and Constituted by R, L, C, operational amplifier and transistor.…”

Section: Negative Group Delay Performance Comparison Resultsmentioning

confidence: 99%

“…It was found that the NGD function enables also to propagate signals with superluminal effect (Cao et al., 2003; Munday & Henderson, 2004; Ségard & Macke, 2008). The existence and the designability of electronic circuits exhibiting the NGD function becomes also an attractive research topic for electronic design engineers (Abuelma'atti & Khalifa, 2018; Cao et al., 2003; Jian‐Wu & Zheng‐He, 2015; Kitano et al., 2003; Mao et al., 2019; Meng et al., 2018; Mitchell & Chiao, 1998, 1997; Munday & Henderson, 2004, 2007; Nakanishi et al., 2002; Ravelo, 2014, 2017; Ravelo, Wan, Ge, 2021; Ségard & Macke, 2008; Wan, Wang, Ravelo et al., 2019; Vauché et al., 2021) The intriguing NGD function has also experimented with abnormal electronic circuits (Mao et al., 2019). Time‐domain demonstrations (Jian‐Wu & Zheng‐He, 2015; Kitano et al., 2003; Munday & Henderson, 2004; Nakanishi et al., 2002; Wan, Wang, Ravelo et al., 2019) with electronic circuits were carried out to illustrate the NGD function.…”

Section: Introductionmentioning

confidence: 99%

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Innovative Study of Resistor Shunt‐Based Bridged‐T Topology With Bandpass Negative Group Delay Behavior

Nebhen

Chan

et al. 2021

Radio Science

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In this paper, new bridged‐T network operating with bandpass (BP) negative group delay (NGD) function is introduced. The circuit design is innovatively based on an inductorless passive RC‐network. The innovative bridged‐T topology is implemented with a R‐shunt configuration. The analytical transfer function of voltages and equivalent impedance‐matrix are carefully calculated. The BP NGD analysis and design of the bridged‐T topology is developed. The BP NGD properties and specifications are analytically investigated. A proof of concept of R‐shunt bridged‐T prototype with a surface‐mounted device printed circuit board is designed, fabricated, and measured to verify the BP NGD behavior from theoretical equations and simulations. As expected, the theoretical, simulation, and measurements results are in very good agreement. From measurement results, the fabricated BP NGD C‐shunt bridged‐T reaches a delay of about −45 ns and a center frequency of about 0.5 MHz over a −3 dB attenuation.

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Section: Negative Group Delay Performance Comparison Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Innovative Study of Resistor Shunt‐Based Bridged‐T Topology With Bandpass Negative Group Delay Behavior

Nebhen

Chan

et al. 2021

Radio Science

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“…This time-domain NGD effect is not in contradiction with the causality [18,19] and for example the NGD effect has been experimented with audio signals [23]. Various NGD circuits based on lumped circuits have been designed [26][27][28]. But so far, despite the work done on this extraordinary function, the NGD function is still not clearly interpreted by non-specialist due to the circuit topology complexity [26][27][28].…”

Section: Introductionmentioning

confidence: 99%

“…Various NGD circuits based on lumped circuits have been designed [26][27][28]. But so far, despite the work done on this extraordinary function, the NGD function is still not clearly interpreted by non-specialist due to the circuit topology complexity [26][27][28]. Therefore, further studies are necessary for the understanding of this intriguing function as the common classical electronic functions such as filters, amplifiers, oscillators, phase shifters, etc.…”

Section: Introductionmentioning

confidence: 99%

Study and experimentation of a 6-dB attenuation low-pass NGD circuit

Randriatsiferana¹,

Gan

Wan

et al. 2021

Analog Integr Circ Sig Process

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Because of its counterintuitive nature, the Negative Group Delay (NGD) remains as an uncommon and unfamiliar electronic function. For this reason, the design and analysis of NGD circuits is not well-known for most of electronic designers. This paper initiates a basic and easy to understand theory, in addition to a design methodology for the low-pass NGD function. The circuit theory on the low-pass NGD function is described using a NGD passive topology which is constituted by a RCparallel network with a resistive load. The NGD analysis and synthesis equations in function of NGD specifications are provided and a proof-of-concept of 6dB low-pass NGD circuits has been designed, simulated, fabricated and tested. Frequency and time domain analyses have been performed to validate the low-pass NGD function. Theoretical and simulated results are in very good agreement and a NGD has been obtained in measurement for the proposed structure.

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“…Thus, despite the implicit counterintuitive effect, it was emphasized that the NGD function does not contradict the causality (Mitchell and Chiao, 1997, 1998). Last two decades, different design of active circuits based on bilateral gain-compensated (Kandic and Bridges, 2011), current-feedback operational-amplifier and uses grounded resistors and capacitors (Abuelma’atti and Khalifa, 2018) and broadband switch-less bi-directional amplifier (Meng et al , 2018) circuits were proposed.…”

Section: Introductionmentioning

confidence: 99%

High-pass NGD characterization of resistive-inductive network based low-frequency circuit

Guérin

Wan

Gorshkov

et al. 2021

COMPEL

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Purpose The purpose of this paper is to provide the high-pass (HP) negative group delay (NGD) circuit based (RL) network. Synthesis and experimental investigation of HP-NGD circuit are developed. Design/methodology/approach The research work methodology is organized in three phases. The definition of the HP-NGD ideal specifications is introduced. The synthesis method allowing to determine the RL elements is developed. The validation results are discussed with comparison between the calculated model, simulation and measurement. Findings This paper shows a validation of the HP-NGD theory with responses confirming NGD optimal frequency, value and attenuation of about (9 kHz, −1.12 µs, −1.64 dB) and (21 kHz, −0.92 µs, −4.81 dB) are measured. The tested circuits have experimented NGD cut-off frequencies around 5 and 11.7 kHz. Research limitations/implications The validity of the HP-NGD topology depends on the coil self-inductance resonance. The HP-NGD effect is susceptible to be penalized by the parasitic elements of the self. Practical implications The NGD circuit is usefully exploited in the electronic and communication system to reduce the undesired delay effect context. The NGD can be used to compensate the delay in any electronic devices and system. Social implications Applications based on the NGD technology will be helpful in the communication, transportation and security research fields by reducing the delay inherent to any electronic circuit. Originality/value The originality of the paper concerns the synthesis formulations of the RL elements in function of the expected HP-NGD optimal frequency, value and attenuation. In addition, an original measurement technique of HP-NGD is also introduced.

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A new CFOA-based negative group delay cascadable circuit

Cited by 20 publications

References 18 publications

Innovative Study of Resistor Shunt‐Based Bridged‐T Topology With Bandpass Negative Group Delay Behavior

Innovative Study of Resistor Shunt‐Based Bridged‐T Topology With Bandpass Negative Group Delay Behavior

Study and experimentation of a 6-dB attenuation low-pass NGD circuit

High-pass NGD characterization of resistive-inductive network based low-frequency circuit

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