Delay-compensation techniques for ultra-low-power subthreshold CMOS digital LSIs

Osaki, Yuji; Hirose, Takahisa; Matsumoto, Keīichi; Kuroki, Nobutaka; Numa, Masahiro

doi:10.1109/mwscas.2009.5236044

Cited by 14 publications

(9 citation statements)

References 2 publications

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“…The transient results of dual-or multi-band NGD devices can be used for compensating signal delays in multi-channel propagation media. Their field of applications concerns the RF/microwavesignal delay compensation as introduced in [24][25][26][27], the correction of data synchronization in certain RF/digital systems and the enhancement of multi-channel like MIMO modular in terms of symbolinterleave cancellation.…”

Section: Discussionmentioning

confidence: 99%

“…Meanwhile, well-synchronized signals are required to maintain the system coherences. In order to enhance this signal synchronization in the digital, RF/microwave and millimeter-wave equipments, various transmission data group delay enhancement techniques based on the application of negative group delay (NGD) concept in baseband and microwave bands were proposed [17][18][19][20][21][22][23][24][25][26][27]. For that, different types of electronic circuit topologies mostly, inspired from the metamaterials, were deployed to realize the NGD function.…”

Section: Introductionmentioning

confidence: 99%

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An FET-based microwave active circuit with dual-band negative group delay

Ravelo

Blasi²

2011

J. Microw. Optoelectron. Electromagn. Appl.

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Recent studies proved that certain electronic active circuits are capable to exhibit simultaneously a negative group delay (NGD) and amplification in microwave frequency bands. One of the simplest topologies generating this counterintuitive NGD function effect is formed by a series RLC-network in cascade with a transistor. By using this cell, similar to the classical electronic functions, dual-band NGD microwave devices with loss compensation possibility can be designed. Theoretic demonstrations concerning the theory of the NGD circuit considered are presented. The dual-band NGD concept feasibility is concretely illustrated by an example of EM/circuit co-simulations. So, in frequency domain, dual-band NGD with minimal values of about-1 ns was observed simultaneously within two frequency bands centered at about 1.05 GHz and 2.05 GHz. To highlight the functioning of the hybrid device considered, time-domain analysis showing the RF/microwave signal advancement is performed. As application, the concept investigated can be envisaged for data synchronization in multi-channel wireless communication systems eventually degraded by undesired EMI effects.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An FET-based microwave active circuit with dual-band negative group delay

Ravelo

Blasi²

2011

J. Microw. Optoelectron. Electromagn. Appl.

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“…With the increase of data processing operating rate and electronic system complexity, the influences of group delay and propagation delay can be critical . To overcome this undesired effect, compensation techniques based on the use of repeaters were introduced for the enhancement of numerical electronic systems . In addition, an equalization technique with negative group delay (NGD) circuits using transistors and microwave amplifier enabling to reconstitute the signals degraded by electronic interconnects was also developed .…”

Section: Introductionmentioning

confidence: 99%

Similitude between the NGD function and filter gain behaviours

Ravelo

2013

Circuit Theory & Apps

177

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This paper deals with the similitude between the behaviours of linear filter gain and negative group delay (NGD) function. The transposition method of low‐pass/high‐pass, low‐pass/band‐pass and low‐pass/band‐stop NGD circuits is established. To the best of the author knowledge, it acts as the first paper devoted on the NGD function generalized theory. The introduced transform relationships simplify the synthesis of any NGD circuits from simple elementary low‐pass NGD topologies. Families of innovative NGD topologies are identified. To verify the relevance of the concept proposed, frequency‐ and time‐domain analysis results from realistic proofs of concept demonstrating the feasibility of developed NGD transforms were performed. Thanks to the NGD phenomenon, the possibility of the ultra‐wideband pulse signals propagating in time‐advance is verified. Finally, potential applications of NGD circuits are discussed. Copyright © 2013 John Wiley & Sons, Ltd.

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“…Currently, one of technological issues which bottleneck the progress of current digital electronic systems is caused by the delay effects. As examples, it was reported that designers of microwave devices [18], [19] and electronic boards and circuits [20], [21] must take into account the different kinds of delays induced by the electrical links and interconnect buses. To cope with such aspects, various applications of NGD circuits based on the delay and phase compensation techniques were introduced recently.…”

Section: Introductionmentioning

confidence: 99%

Elementary NGD IIR/FIR Systems

Ravelo¹

2014

IJSPS

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This paper deals with the synthesis and design of impulse response digital systems exhibiting negative group delay (NGD). It is demonstrated that under certain condition, certain first order FIR and IIR systems can provide the NGD function. Synthesis methods of NGD FIR/IIR transfer functions are introduced. Then, the basic properties specific to the NGD digital functions are established. To validate the theory proposed, NGD FIR and IIR systems were synthesized and implemented with Matlab. As expected, group delay frequency responses with NGD in baseband frequency well-correlated to the theoretic hypothesis were found. Then, thanks to the NGD effect, arbitrary form discrete transient signals with limited bandwidth propagating in time advance were demonstrated in time-domain. It is proved that this counterintuitive function does not forbid the causality principle and the NGD numerical system respects the functioning condition of the classical digital system. The NGD principle presented is potentially useful for the group delay correction processes and the signal pure delay reduction. 

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Delay-compensation techniques for ultra-low-power subthreshold CMOS digital LSIs

Cited by 14 publications

References 2 publications

An FET-based microwave active circuit with dual-band negative group delay

An FET-based microwave active circuit with dual-band negative group delay

Similitude between the NGD function and filter gain behaviours

Elementary NGD IIR/FIR Systems

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