A new twisted differential line structure in global bus design

Twisted differential line structure can effectively reduce crosstalk noise on global bus, which foresees a wide applicability. However, measured performance based on fabricated circuits is much worse than simulated performance based on the layout. It is suspected that the via resistance variation is...

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Published in:2007 44th ACM/IEEE Design Automation Conference pp. 180 - 183
Main Authors: Jiang, Zhanyuan, Hu, Shiyan, Shi, Weiping
Format: Conference Proceeding
Language:English
Published: New York, NY, USA ACM 04.06.2007
IEEE
Series:ACM Conferences
Subjects:
Algorithm
Algorithm design and analysis
Circuit simulation
Crosstalk
Design
Differential line
Distortion measurement
Electrical resistance measurement
Frequency synchronization
Global bus
Hardware > Hardware validation
Noise reduction
Performance analysis
Permission
Redundant via
Reliability
Very large scale integration
redundant via
differential line
global bus
ISBN:1595936270, 9781595936271
ISSN:0738-100X
Online Access:Get full text
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Abstract Twisted differential line structure can effectively reduce crosstalk noise on global bus, which foresees a wide applicability. However, measured performance based on fabricated circuits is much worse than simulated performance based on the layout. It is suspected that the via resistance variation is the cause. In this paper, our extensive simulation confirm this. A new redundant via insertion technique is proposed to reduce via variation and signal distortion. In addition, a new buffer insertion technique is proposed to synchronize the transmitted signals, thus further improving the effectiveness of the twisted differential line. Experimental results demonstrate that the new approaches are highly effective. Under a realistic setup, a 6GHz signal can be transmitted with high fidelity using the new approaches. In contrast, only a 100MHz signal can be reliably transmitted using a single-end model with power/ground shielding. In addition, compared to conventional twisted differential line structure, our new techniques can reduce the magnitude of noise by 45%. Furthermore, compared to unbuffered twisted differential line structure, the maximum signal phase difference is reduced from 37ps to 7ps by the new buffer insertion technique.
AbstractList Twisted differential line structure can effectively reduce crosstalk noise on global bus, which foresees a wide applicability. However, measured performance based on fabricated circuits is much worse than simulated performance based on the layout. It is suspected that the via resistance variation is the cause.
Twisted differential line structure can effectively reduce crosstalk noise on global bus, which foresees a wide applicability. However, measured performance based on fabricated circuits is much worse than simulated performance based on the layout. It is suspected that the via resistance variation is the cause. In this paper, our extensive simulation confirm this. A new redundant via insertion technique is proposed to reduce via variation and signal distortion. In addition, a new buffer insertion technique is proposed to synchronize the transmitted signals, thus further improving the effectiveness of the twisted differential line. Experimental results demonstrate that the new approaches are highly effective. Under a realistic setup, a 6 GHz signal can be transmitted with high fidelity using the new approaches. In contrast, only a 100 MHz signal can be reliably transmitted using a single-end model with power/ground shielding. In addition, compared to conventional twisted differential line structure, our new techniques can reduce the magnitude of noise by 45%. Furthermore, compared to unbuffered twisted differential line structure, the maximum signal phase difference is reduced from 37ps to 7ps by the new buffer insertion technique. Categories and Subject Descriptors: B.8.2 [Performance and Reliability]:Performance Analysis and Design Aids General Terms: Algorithm, Design, Performance, Reliability.
Twisted differential line structure can effectively reduce crosstalk noise on global bus, which foresees a wide applicability. However, measured performance based on fabricated circuits is much worse than simulated performance based on the layout. It is suspected that the via resistance variation is the cause. In this paper, our extensive simulation confirm this. A new redundant via insertion technique is proposed to reduce via variation and signal distortion. In addition, a new buffer insertion technique is proposed to synchronize the transmitted signals, thus further improving the effectiveness of the twisted differential line. Experimental results demonstrate that the new approaches are highly effective. Under a realistic setup, a 6GHz signal can be transmitted with high fidelity using the new approaches. In contrast, only a 100MHz signal can be reliably transmitted using a single-end model with power/ground shielding. In addition, compared to conventional twisted differential line structure, our new techniques can reduce the magnitude of noise by 45%. Furthermore, compared to unbuffered twisted differential line structure, the maximum signal phase difference is reduced from 37ps to 7ps by the new buffer insertion technique.
Author Shi, Weiping
Hu, Shiyan
Jiang, Zhanyuan
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Keywords redundant via
differential line
global bus
Language English
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Snippet Twisted differential line structure can effectively reduce crosstalk noise on global bus, which foresees a wide applicability. However, measured performance...
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StartPage 180
SubjectTerms Algorithm
Algorithm design and analysis
Circuit simulation
Crosstalk
Design
Differential line
Distortion measurement
Electrical resistance measurement
Frequency synchronization
Global bus
Hardware -- Hardware validation
Noise reduction
Performance analysis
Permission
Redundant via
Reliability
Very large scale integration
Title A new twisted differential line structure in global bus design
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