Time- and Frequency-Domain Measurements for an Active Negative Group Delay Circuit

Erickson, S.J.; Moiduddin, Khaja; Mojahedi, Mo

doi:10.1109/aps.2005.1552375

Cited by 17 publications

(15 citation statements)

References 9 publications

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“…This operation can be produced thanks to the NGD effect which is naturally linked to the negative group velocity [8][9]. The existence of this singular phenomenon has been confirmed with different passive [8][9][10][11][12] and active [13][14][15][16][17][18][19][20][21][22][23][24] electronic circuits. It was verified that the NGD effect is not in contradiction with the causality principle [18][19].…”

Section: Introductionmentioning

confidence: 59%

UWB NGD circuit for time-delay reduction

Ravelo

Jastrzebski

2012

2012 Asia-Pacific Symposium on Electromagnetic Compatibility

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Section: Introductionmentioning

confidence: 59%

UWB NGD circuit for time-delay reduction

Ravelo

Jastrzebski

2012

2012 Asia-Pacific Symposium on Electromagnetic Compatibility

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“…It was observed that by injecting arbitrary wave form signals to the NGD circuit, it was demonstrated that the output signal wave fronts exit the circuit before those of the input penetrating in the circuit. As argued in [10][11][12][13][14][19][20], this effect is not in contradiction with the causality because the input bandwidth is sufficiently limited. Whereas with the second NGD topology investigated, NGD around 1.19 GHz with minimal value of about -1.5 ns was generated.…”

Section: General Conclusionmentioning

confidence: 82%

“…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]. Inversely to the ordinary medium, in this case, the time delay can be assumed as negative [4][5][9][10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

“…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%

See 1 more Smart Citation

Synthesis of RF Circuits with Negative Time Delay by Using LNA

Ravelo

2013

AEM

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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.

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“…However, such NGD circuit operates only up to some hundreds kHz [23][24][25]. It was stated that the NGD effect does not contradict the causality principle [19][20][21][22][23][24][25][26]. In addition, the left-handed (LH) lumped passive circuit capable to generate NGD effect for microwave signals up to GHz has been introduced by the group of Mojahedi [15][16].…”

Section: Introductionmentioning

confidence: 99%

Neutralization of LC- and RC-Disturbances with Left-Handed and NGD Effects

Ravelo

2013

AEM

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This paper focus is on the neutralization technique of the unwanted parasitic effects on radio frequencies (RF) and digital electronic circuits. Most of parasitic effects induced in these circuits can be modeled by RC-and LC-networks. For canceling these disturbing effects, we can proceed with operation as transfer function neutralization in the considered operating frequency bands. The neutralization presented in this paper is developed by using first, a lefthanded (LH) and negative group delay (NGD) circuits inspired from metamaterials. The theoretical approach illustrating the RC-and LC-effects neutralization is described. Synthesis relations enabling to determine the elements of required LH and NGD circuit correctors in function of the perturbation parameters are established. Numerical and experimental demonstrators are presented to validate the technique proposed.

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Time- and Frequency-Domain Measurements for an Active Negative Group Delay Circuit

Cited by 17 publications

References 9 publications

UWB NGD circuit for time-delay reduction

UWB NGD circuit for time-delay reduction

Synthesis of RF Circuits with Negative Time Delay by Using LNA

Neutralization of LC- and RC-Disturbances with Left-Handed and NGD Effects

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