Design of a Controllable Delay Line

Kabiri, Ali; He, Qing; Kermani, M.H.; Ramahi, Omar M.

doi:10.1109/tadvp.2010.2064166

Cited by 19 publications

(14 citation statements)

References 15 publications

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“…A similar analysis, but in the range of parameters, is made in [5] . Comparison between the electromagnetic and quasi-static analysis results and the experimental results obtained for the strip line is given in [6] .…”

Section: Introductionmentioning

confidence: 92%

Comparative Electromagnetic and Quasi–Static Simulations of a Shortpulse Propagation along Microstrip Meander Delay Lines with Design Constraints

Orlov

Gazizov

Zabolotsky

2016

Journal of Electrical Engineering

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A numerical analysis of microstrip meander delay lines is considered. Results of quasi-static and electromagnetic simulations are given. It is shown that when increasing a number of turns and proportionally reducing their length, distortions of a pulse signal in the line are reduced. At the same time, despite structure's electrical width increase, the agreement between the results of quasi-static and electromagnetic analyses is improved. Thus, it is demonstrated that when designing the microstrip meander delay lines with minimal distortions, the quasi-static analysis is relevant.

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Section: Introductionmentioning

confidence: 92%

Comparative Electromagnetic and Quasi–Static Simulations of a Shortpulse Propagation along Microstrip Meander Delay Lines with Design Constraints

Orlov

Gazizov

Zabolotsky

2016

Journal of Electrical Engineering

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“…A wire with concatenated meander segments is shown in Fig. 1b delay compensation method, much research effort has been put into the study of their delay characteristics [19]- [22]. In [19] it is shown that crosstalk noise between meander segments has an accumulation effect in high-speed designs and a speedup effect on the wires may appear in such patterns of high density.…”

Section: Introductionmentioning

confidence: 99%

“…In [20] a moment technique is proposed to approximate the delays of wires with meander segments, and in [21] a method with finite-difference timing domain is used for qualitative prediction of such delays. Furthermore, in [22] a linear model is formulated to control the wire delay by adjusting the number of meander segments on a fixed-shape wire. According to [19]- [22], when a signal travels along meander segments, the crosstalk between the segments of the same wire accumulates gradually.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, in [22] a linear model is formulated to control the wire delay by adjusting the number of meander segments on a fixed-shape wire. According to [19]- [22], when a signal travels along meander segments, the crosstalk between the segments of the same wire accumulates gradually. Therefore, the signal can reach the sinking pin earlier than estimated using the wire length, thus causing delay mismatch between bus signals.…”

Section: Introductionmentioning

confidence: 99%

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ILP-Based Alleviation of Dense Meander Segments With Prioritized Shifting and Progressive Fixing in PCB Routing

Tseng

et al. 2015

IEEE Trans. Comput.-Aided Des. Integr. Circuits Syst.

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Length-matching is an important technique to balance delays of bus signals in high-performance printed circuit board (PCB) routing. Existing routers, however, may generate very dense meander segments. Signals propagating along these meander segments exhibit a speedup effect due to crosstalk between the segments of the same wire, thus leading to mismatch of arrival times even under the same physical wire length. In this paper, we present a post-processing method to enlarge the width and the distance of meander segments and hence distribute them more evenly on the board so that crosstalk can be reduced. In the proposed framework, we model the sharing of available routing areas after removing dense meander segments from the initial routing, as well as the generation of relaxed meander segments and their groups for wire length compensation. This model is transformed into an ILP problem and solved for a balanced distribution of wire patterns. In addition, we adjust the locations of long wire segments according to wire priorities to swap free spaces toward critical wires that need much length compensation. To reduce the problem space of the ILP model, we also introduce a progressive fixing technique so that wire patterns are grown gradually from the edge of the routing toward the center area. Experimental results show that the proposed method can expand meander segments significantly even under very tight area constraints, so that the speedup effect can be alleviated effectively in high-performance PCB designs.Index Terms-Dense meander segments, ILP model, printed circuit board (PCB) routing, speedup effect.

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“…In [6] a moment technique is proposed to approximate the delays of wires with meander segments, and in [7] a method with finite-difference timing domain is used for the qualitative prediction of such delay lines. Furthermore, in [8] a linear model is formulated to control the wire delay by adjusting the number of meander segments on a fixed-shape wire.…”

Section: Introductionmentioning

confidence: 99%

Post-route alleviation of dense meander segments in high-performance printed circuit boards

Tseng¹,

Li²,

Ho³

et al. 2013

2013 IEEE/ACM International Conference on Computer-Aided Design (ICCAD)

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Abstract-Length-matching is an important technique to balance delays of bus signals in high-performance PCB routing. Existing routers, however, may generate dense meander segments with small distance. Signals propagating across these meander segments exhibit a speedup effect due to crosstalks between the segments of the same wire, thus leading to mismatch of arrival times even with the same physical wire length. In this paper, we propose a post-processing method to enlarge the width and the distance of meander segments and distribute them more evenly on the board so that the crosstalks can be reduced. In the proposed framework, we model the sharing combinations of available routing areas after removing dense meander segments from the initial routing, as well as the generation of relaxed meander segments and their groups in subareas. Thereafter, this model is transformed into an ILP problem and solved efficiently. Experimental results show that the proposed method can extend the width and the distance of meander segments about two times even under very tight area constraints, so that the crosstalks and thus the speedup effect can be alleviated effectively in high-performance PCB designs.

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Design of a Controllable Delay Line

Cited by 19 publications

References 15 publications

Comparative Electromagnetic and Quasi–Static Simulations of a Shortpulse Propagation along Microstrip Meander Delay Lines with Design Constraints

Comparative Electromagnetic and Quasi–Static Simulations of a Shortpulse Propagation along Microstrip Meander Delay Lines with Design Constraints

ILP-Based Alleviation of Dense Meander Segments With Prioritized Shifting and Progressive Fixing in PCB Routing

Post-route alleviation of dense meander segments in high-performance printed circuit boards

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