Similitude between the NGD function and filter gain behaviours

Ravelo, Blaise

doi:10.1002/cta.1902

Cited by 102 publications

(197 citation statements)

References 40 publications

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“…[17][18][19][20][21] The NGD behaviors are similar to the classical linear filter responses. 18 A methodology enabling the elementary NGD topology identification was introduced. 19 These NGD active topologies are potentially susceptible to work up to several GHz in addition to the possibility of loss compensation.…”

Section: Introductionmentioning

confidence: 63%

“…To cope with such technical issue, the NGD microwave circuit based equalization technique can be the best candidate compared to the other equalizers. [29][30][31] Nonetheless, the existing NGD microwave active circuits [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] are generally designed with lumped networks. The NGD passive circuits 1-6 present significant loss generally widely above several tens of dB in the NGD bandwidth.…”

Section: Introductionmentioning

confidence: 99%

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Tee power divider and combiner based negative group delay topology

Ravelo

2018

Int J RF Microw Comput Aided Eng

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An innovative topology of negative group delay (NGD) microwave circuit based on the interconnected power divider and combiner (PWD/PWC) is investigated. The distributed cell consists of PWD and PWC with the input and outputs interconnected by a transmission line (TL). The theory is based on the S‐parameter modeling. The NGD existence condition is formulated. The NGD properties constituted by the NGD bandwidth, level and figure of merit are introduced. It is shown that the distributed topology behaves as a bandpass NGD circuit. The NGD topology theoretical efficiency is verified with simulations by considering NGD circuit parametric analyses by varying the PWD‐PWC interconnect TL attenuation. To validate experimentally the NGD concept, two prototypes of one‐ and two‐stage passive NGD cells were designed in microstrip technology, fabricated and tested. The one‐ and two‐stage circuit prototypes exhibit NGDs of about −2.2 ns and −4.7 ns with −3.4 dB and −7.5 dB insertion loss, respectively. The NGD phenomenon was generated around 1.85 GHz‐center frequency over about 35 MHz‐NGD bandwidth.

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Section: Introductionmentioning

confidence: 63%

Section: Introductionmentioning

confidence: 99%

Tee power divider and combiner based negative group delay topology

Ravelo

2018

Int J RF Microw Comput Aided Eng

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“…The magnitude and NGD values derived from this VTF at very low-frequencies are written as, respectively [31]:…”

Section: ) Analysis Of Lp Ngd Elementary Topology Constituted By Rc-mentioning

confidence: 99%

“…A fundamental and academic approach to answer to this curiosity was the initiation of analogy between the filter and NGD behavior [31][32][33]. Based on this similitude behavior, the concept of LP [32] and HP [33] NGD functions was introduced and verified with linear lumped circuits.…”

Section: Introductionmentioning

confidence: 99%

Original Theory of NGD Low Pass-High Pass Composite Function for Designing Inductorless BP NGD Lumped Circuit

Ravelo

Ngoho²,

Fontgalland

et al. 2020

IEEE Access

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This paper aims to develop an original circuit theory of inductorless NGD topology. The considered passive cell comprised of resistor and capacitor elements without inductor operates as a bandpass (BP) NGD function. The specifications of NGD functions are defined. Generally, the BP NGD fully lumped circuits available in the literature operate with resonant RLC-network. In the introduced research work, a lumped circuit was first time identified to exhibit the BP behavior without the presence of inductive component. The inductorless BP NGD topology is inspired from the combination of low-pass (LP) and high-pass (HP) NGD passive cells. Therefore, an original LP-HP 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 inductorless 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 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 LP-HP NGD composite theory. To validate the developed original circuit theory, two prototypes of RC-network based LP-HP 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 inductorless topology enable to overcome the traditional limitations of RLC-network based BP NGD circuits because of inductance self-effect limitation. INDEX TERMS Bandpass (BP) negative group delay (NGD), Low-pass/high-pass (LP-HP) NGD composite, Circuit theory, Inductorless passive topology.

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“…The intrinsic limitation of the time-advance in function of NGD circuit parameters is pointed out in [33]. An analogy between the linear filter and NGD function was emphasized [34]. A canonical form of low-pass NGD function was stated [35].…”

Section: Introductionmentioning

confidence: 99%

Reconstruction Technique of Distorted Sensor Signals with Low-Pass NGD Function

et al. 2020

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This paper develops a new reconstruction technique of undesirable signal distortion generated by sensor electronic circuits. The introduced reconstruction technique is originally realized with unfamiliar low-pass negative group delay (NGD) function. The feasibility condition of the proposed reconstruction technique in function of the sensor signal spectrum bandwidth under consideration is elaborated. The reconstruction technique principle is theoretically introduced by means of identification of low-pass NGD function parameters and the appropriated circuit topology. The unfamiliar low-pass NGD function analysis and synthesis equations are established. As an example, for the feasibility study, an RC-network based low-pass active cell is considered to implement the low-pass NGD function. A design method of NGD circuit in function of the sensor distortion transfer function is described in different successive steps. The developed NGD reconstruction technique is validated by different proofs of concept. First, transient simulations are carried out with Gaussian and sinc analytical signals. Then, experimental feasibility study is also performed with arbitrary waveform signal. As expected, the NGD reconstruction technique efficiency is confirmed with improvement of distorted signal integrity parameters and cross correlation better than 97%.

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Similitude between the NGD function and filter gain behaviours

Cited by 102 publications

References 40 publications

Tee power divider and combiner based negative group delay topology

Tee power divider and combiner based negative group delay topology

Original Theory of NGD Low Pass-High Pass Composite Function for Designing Inductorless BP NGD Lumped Circuit

Reconstruction Technique of Distorted Sensor Signals with Low-Pass NGD Function

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