Synthesis of Broadband Negative Group Delay Active Circuits

Ravelo, Blaise; Pérennec, André; Roy, Matthieu

doi:10.1109/mwsym.2007.380357

Cited by 43 publications

(58 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Since NGD occurs at the range of frequencies where the absorption or the attenuation is maximum [2], conventionally, in the microwave regime, bandstop structures are used to realize NGD circuitry. Based on either series or shunt resonators, many active and passive NGD circuitries have been proposed and demonstrated with or without tunability [6]- [11].…”

Section: Introductionmentioning

confidence: 99%

Maximally Flat Negative Group-Delay Circuit: A Microwave Transversal Filter Approach

Itoh

2014

IEEE Trans. Microwave Theory Techn.

100

View full text Add to dashboard Cite

Abstract-A comprehensive method to synthesize negative group delay (NGD) in the microwave regime with a maximally flat response is proposed in this paper. This method is based on transversal-filter topologies; it will be shown that by choosing proper coupling coefficients of each tap of a transversal filter, we can realize NGDs with maximally flat characteristics at the output of the transversal filter. The desired coefficients to realize maximally flat NGDs with various amount of group delay are analytically derived and tabulated in this paper. Furthermore, the results are verified experimentally through microwave transversal-filter approaches in both passive and active ways using multi-section asymmetric directional couplers and distributed amplifiers.

show abstract

Section: Introductionmentioning

confidence: 99%

Maximally Flat Negative Group-Delay Circuit: A Microwave Transversal Filter Approach

Itoh

2014

IEEE Trans. Microwave Theory Techn.

100

View full text Add to dashboard Cite

show abstract

“…In microwave regime, conventionally, bandstop structures are used to realize NGD circuitry; based on either series or shunt RLC resonators, many active and passive NGD circuitries have been proposed and demonstrated with or without tunability [2]- [5].…”

Section: Introductionmentioning

confidence: 99%

A Dual-Purpose Reconfigurable Negative Group Delay Circuit Based on Distributed Amplifiers

Gharavi

Daneshrad

et al. 2013

IEEE Microw. Wireless Compon. Lett.

View full text Add to dashboard Cite

A dual-purpose reconfigurable negative group delay circuit based on distributed amplifiers Abstract-In this letter, a novel reconfigurable negative group delay distributed amplifier (NGD-DA) circuit is proposed. This NGD-DA offers a new method to realize negative group delay. By properly choosing the gain coefficient of each tap for the DA, we can synthesize the negative group delay at the reverse port of the DA in the frequency band of interest, while maintaining a flat gain at the forward port; this results in a dual-purpose DA. Moreover, the proposed NGD-DA is reconfigurable; the phase response at the reverse port can be simply controlled by adjusting the tap gain coefficients, and therefore the bandwidth as well as the amount of negative group delay can be manipulated. The proposed active NGD circuit is validated through theoretical explanation and experimental results.Index Terms-Dispersion engineering, distributed amplifier (DA), dynamic power supply, negative group delay (NGD), superluminal group velocity, transversal filter.

show abstract

“…Recent studies revealed that certain passive [1][2][3][4][5][6][7][8] and active [9][10][11][12][13][14][15][16][17][18] circuits are susceptible to exhibit the negative group delay (NGD) function at low-and RF-/microwavefrequencies. Theoretical and experimental analyses confirm that this innovative physical function allows to generate an output signal with wave fronts propagating in advance of its input under certain conditions [7][8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of RF Circuits with Negative Time Delay by Using LNA

Ravelo

2013

AEM

View full text Add to dashboard Cite

A demonstration of the negative time-delay by using active circuit topologies with negative group delay (NGD) is described in this paper. This negative time delay is realized with two different topologies operating in base band and modulated frequencies. The first NGD topology is composed of an RL-network in feedback with an RF/microwave amplifier. Knowing the characteristics of the amplifier, a synthesis method of this circuit in function of the desired NGD values and the expected time advance is established. The feasibility of this extraordinary physical effect is illustrated with frequency-and time-domain analyses. It is shown in this paper that by considering an arbitrary waveform signal, output in advance of about 7 ns is observed compared to the corresponding input. It is stated that such an effect is not in contradiction with the causality. The other NGD topology is comprised of a microwave amplifier associated with an RLC-series resonant. The theoretical approach illustrating the functioning of this NGD circuit is established by considering the amplifier Sparameters. Then, synthesis relations enabling to choose the NGD device parameters according to the desired NGD and gain values are also established. To demonstrate the relevance of the theoretic concept, a microwave device exhibiting NGD function of about -1.5 ns at around 1.19 GHz was designed and analyzed. The NGD device investigated in this paper presents advantages on its faculty to exhibit positive transmission gain, the implementation of the bias network and matching in the considered NGD frequency band.

show abstract

Synthesis of Broadband Negative Group Delay Active Circuits

Cited by 43 publications

References 9 publications

Maximally Flat Negative Group-Delay Circuit: A Microwave Transversal Filter Approach

Maximally Flat Negative Group-Delay Circuit: A Microwave Transversal Filter Approach

A Dual-Purpose Reconfigurable Negative Group Delay Circuit Based on Distributed Amplifiers

Synthesis of RF Circuits with Negative Time Delay by Using LNA

Contact Info

Product

Resources

About