A SYNTHETIC DESIGN OF ELIMINATING CROSSTALK WITHIN MTLs

Chen, Hui; Zhang, Yuxing

doi:10.2528/pier07070603

Cited by 10 publications

(10 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As the guard trace acts as a transmission line, it cannot remain at ground potential throughout its entire length [23]. Grounded vias on the guard trace that are connected to the ground plane can enhance the performance of the guard trace, although this will be limited if the number of grounded vias is too small [8].…”

Section: Guard Tracementioning

confidence: 99%

“…guard [8] Via guard meter [3], as well as K NE and K FE [3,8,13]. As this SGT design can increase C m up to 3.10 pf/m in Table 1 without increasing L m [3], K FE = −0.00514 of the SGT is the lowest in Table 1; the SGT design thus reduces FEXT.…”

Section: -W [13]mentioning

confidence: 99%

“…Therefore, grounded vias on the guard traces are used instead to reduce crosstalk [18]. A certain number of grounded vias is equivalent to the terminator approach; fewer vias results in more noise, and more vias perform better than the terminator approach [8].…”

Section: Introductionmentioning

confidence: 99%

“…Microstrips are widely used in PCB applications and have become the most common forms of interconnection because they are inexpensive and easy to manufacture [3,4]. As the space between neighboring parallel microstrips is extremely limited in high-density circuit layouts, electromagnetic coupling between them seriously affects signal integrity (SI) by introducing crosstalk [5][6][7][8][9][10]. Therefore, the ability to avoid crosstalk in PCB layouts is one of the critical factors determining the stability of electronic products.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Suppression of Crosstalk Using Serpentine Guard Trace Vias

Huang

Lu²,

Lin³

2010

PIER

View full text Add to dashboard Cite

Abstract-The reliability of circuits on printed circuit boards (PCBs) in many modern electronic products is affected by severe noise caused by high-speed and low-voltage operation as well as layout constraints compounded by limited space and high circuit density. Crosstalk is a major noise source that interferes with the signal integrity (SI) in poor PCB layout designs. One common method of reducing crosstalk is the three-width (3-W ) rule. The serpentine guard trace (SGT) approach has also been used to reduce crosstalk using two terminal matching resistors on the SGT between the aggressor and victim. Although the SGT approach suppresses far-end crosstalk (FEXT) at the expense of more layout space, it also neglects interference caused by near-end crosstalk (NEXT). In this study, we propose the SGT via (SGTV) approach in which grounded vias are added to the SGT at appropriate locations, and the ratio between the lengths of the horizontal and vertical sections of the guard trace is adjusted to minimize NEXT and FEXT. Frequency domain simulated (measured) results showed that the SGTV approach reduced NEXT by 3.7 (7.65) and 0.83 (1.6) dB as well as FEXT by 5.11 (7.22) and 0.1 (1.98) dB compared to the 3-W and SGT approaches, respectively. In the time domain, simulated (measured) results showed that SGTV reduced NEXT by 34.67% (49.8%) and 27.5% (26.65%) as well as FEXT by 46.78% (56.52%) and 6.91% (24.8%) compared to the 3-W and SGT approaches, respectively. Our proposed approach thus effectively suppresses both NEXT and FEXT to achieve better SI in PCB layout designs than the other two methods. As our design uses two grounded vias instead of two guard trace terminators and does not require extra components, it is less costly than SGT. Our simulated and measured results indicate that our approach is suitable for practical application because of the lower cost and the ease of implementation that eliminates NEXT and FEXT.

show abstract

Section: Guard Tracementioning

confidence: 99%

Section: -W [13]mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Suppression of Crosstalk Using Serpentine Guard Trace Vias

Huang

Lu²,

Lin³

2010

PIER

View full text Add to dashboard Cite

show abstract

“…The trend of device miniaturization causes more compact routing on printed circuit boards (PCBs), which in turn causes signal integrity issues, such as crosstalk and waveform distortion. Therefore, the electromagnetic effect on the PCB cannot be ignored [2][3][4][5][6]. CPU and memory are high-speed digital switching devices, and hence, they are affected by coupling and crosstalk to an even greater extent.…”

Section: Introductionmentioning

confidence: 99%

Crosstalk and Discontinuities Reduction on Multi-Module Memory Bus by Particle Swarm Optimization

Lin¹,

Wu²,

Liu

et al. 2011

PIER

View full text Add to dashboard Cite

Abstract-Due to high-density routing under the CPU and DIMM areas, the original design of even and odd mode characteristic impedances changes. The occurrence of multi-drop problem between the CPU and memory chip causes over-and under-driven that reduce the eye opening. Furthermore, the different phase velocities of evenand odd-modes cause timing jitter at the receiver end. This paper proposes two steps to solve the complex issue of signal integrity for the multi-module memory bus. First, particle swarm optimization (PSO) is used to tune the characteristic impedance of the transmission line and on-die termination (ODT) values to improve transmission line impedance changes to obtain maximum power delivery. The fitness function of the algorithm is defined by selecting the minimum reflection coefficient at the driver side and maximum the transmission coefficient at the receiver side to reduce the over-and under-driven Second, the timing jitter can be reduced by placing a capacitor to compensate for the velocity difference caused by different propagation modes. Finally, signal integrity enhancements for the DDR3 are verified by measuring S parameters in the frequency domain and postprocessed eye diagrams in the time domain.

show abstract