Negative Group Delay Circuit for Feed-Forward Amplifier

Noto, Hifumi; Yamauchi, K.; Nakayama, Minoru; Isota, Yoji

doi:10.1109/mwsym.2007.380286

Cited by 68 publications

(48 citation statements)

References 9 publications

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“…We start from the simplest case, , in which we need two equations to solve for and . One of the two equations can be directly obtained from (7) by assigning the desired group delay, and the other one can be chosen that the magnitude of the transfer function is normalized to unity, which is (8) Therefore, in this instance, without loss of generality, if we set , , then by solving (7) and (8) we will have and . It follows that for an -stage transversal filter with maximally flat NGD responses, the coefficients can be solved by the following equations with :…”

Section: A Derivations Of Maximally Flat Ngd Responsesmentioning

confidence: 99%

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

Itoh

2014

IEEE Trans. Microwave Theory Techn.

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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.

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Section: A Derivations Of Maximally Flat Ngd Responsesmentioning

confidence: 99%

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

Itoh

2014

IEEE Trans. Microwave Theory Techn.

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“…The effect of NGD is observed within a limited frequency band when the absorption or attenuation is at a maximum. Therefore, conventional approaches to realize the NGD circuits are based on bandstop structures using either series or shunt RLC resonators [4][5][6][7][8][9][10][11]. The NGD circuits have been used in various practical applications in communication systems, such as shortening or reducing delay lines [11], enhancing the efficiency of feedforward linear amplifiers [12,13], designing broadband and constant phase shifters [14], realization of non-Foster reactive elements [15], and minimizing beam-squint in series-fed antenna arrays [16].…”

Section: Introductionmentioning

confidence: 99%

Negative Group Delay Phenomenon Analysis Using Finite Unloaded Quality Factor Resonators

Chaudhary¹,

Jeong²

2016

PIER

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Abstract-This paper presents a comprehensive method to analyze negative group delay (NGD) phenomenon at microwave frequency. This method is based on a coupling matrix with finite unloaded quality factor resonators. Unlike conventional NGD circuit topologies that use a lumped resistor R along with bandstop resonators, the proposed topology does not require any R for generating NGD and therefore, provides fully distributed circuit realization. The proposed topology has both source to load and inter-resonator coupling structures. Analytical design equations are provided to obtain predefined NGD with matched input/output ports; the proposed structure therefore does not require any extra matching networks. From analytical analysis, it is also found that the NGD bandwidth as well as magnitude flatness can be controlled by inter-resonator couplings. The proposed design theory is proven through fabrications of NGD circuit at a center frequency of 2.14 GHz. The measurement results are in good agreement with simulations and predicted theoretical results.

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“…In general, the BW of NGD circuits as shown in Fig. 2, is narrow, but the NGD property is sink, as shown by Noto [8] and Siddiqui [9].…”

Section: Designing a Passive Non-foster Circuitmentioning

confidence: 99%

Novel design of a 2.1–2.9 GHz negative capacitance using a passive non-Foster circuit

Seo

2017

IEICE Electron. Express

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Non-Foster circuits (NFC), in conjunction with the effect of negative impedance, have been applied to design broadband radio frequencies (RF) due to their wideband impedance matching ability. There are many approaches to designing non-Foster circuits that use transistors with loops inside to obtain negative reactance. Hence, conventional NFC has some problems, including complex connectivity and power consumption. In this paper, we analyse other properties of NFC phase and group delay, and we realize that these properties are related to properties of negative group delay (NGD) networks. Therefore, we proposed a new design of passive nonFoster circuits, that is less complicated and does not require power.

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Negative Group Delay Circuit for Feed-Forward Amplifier

Cited by 68 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

Negative Group Delay Phenomenon Analysis Using Finite Unloaded Quality Factor Resonators

Novel design of a 2.1–2.9 GHz negative capacitance using a passive non-Foster circuit

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