EMI common-mode current dependence on delay skew imbalance in high speed differential transmission lines operating at 1 gigabit/second data rates

Knighten, J.L.; Smith, N.W.; DiBene, J.T.; Hoeft, L.O.

doi:10.1109/isqed.2000.838888

Cited by 10 publications

(4 citation statements)

References 2 publications

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“…To facilitate the analysis, we neglect the effects of bend discontinuities and consider the delay effect. Cascading the effects of the bend, coupled lines, and bends following the signal trace, the modal voltage at the exit point "g" can be given by (7) where the matrix is defined in (5) and is a delay operator with the delay time defined in the parenthesis. The delay times and are given in Fig.…”

Section: A Dual Back-to-back Coupled Bendsmentioning

confidence: 99%

“…The modal voltages at the exit point "g" can thus be related to those at the entrance point "a" by the explicit matrix multiplication in (7). By applying the incident signal in (6), the coupled common mode voltage at point "g" can be calculated as (8) In common cases that , the maximum coupled common-mode noise as yielded by ( 8) can be given by (9) where the time difference is related to the velocity difference percentage % (10) by % (11) in which are the velocities of the common and differential modes, is their average, and and are the capacitive and inductive coupling coefficients, respectively.…”

Section: A Dual Back-to-back Coupled Bendsmentioning

confidence: 99%

“…The impact of signal integrity and EMI [7] on the amount of common-mode noise generated by the phase skew of different routing lengths should be considered as well.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Noise Reduction Using Compensation Capacitance for Bend Discontinuities of Differential Transmission Lines

Shiue

Guo

Lin

et al. 2006

IEEE Trans. Adv. Packag.

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Differential signaling has become a popular choice for multigigabit digital applications in favor of its low-noise generation and high common-mode noise immunity. Recalling from the full-wave solution of -parameters, this paper presented a design methodology of analysis scheme to extract the equivalent circuits of discontinuities observed on the strongly coupled differential lines. Signal integrity effects of the bent differential transmission lines in a high-speed digital circuit were then simulated in the time domain. A dual back-to-back routing topology of bent differential lines to reduce the common-mode noise was further investigated. To alleviate the common-mode noise at the receiver, a novel compensation scheme in use of the shunt capacitance was also proposed. Furthermore, the comparison between the simulation and measured results validated the equivalent circuit model, coupled bends with compensation capacitance patch, and analysis approach.

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Section: A Dual Back-to-back Coupled Bendsmentioning

confidence: 99%

Section: A Dual Back-to-back Coupled Bendsmentioning

confidence: 99%

See 1 more Smart Citation

Noise Reduction Using Compensation Capacitance for Bend Discontinuities of Differential Transmission Lines

Shiue

Guo

Lin

et al. 2006

IEEE Trans. Adv. Packag.

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“…The emergence of new technologies, leading to high bit rates, short rise times and small noise margins, makes this requirement even more stringent. Unfortunately, conversion easily occurs, due to signal trace length mismatch [6] or asymmetric discontinuities in the circuit layout, and in particular at a bend of coupled microstrip lines [2,4, 5]. A reduction of the unwanted common-mode noise can be obtained by applying filtering structures [4, 5] or by adding extra compensating capacitance [2].…”

Section: Introductionmentioning

confidence: 99%

Time domain analysis of a wideband common-mode suppression filter for bent interconnects

Gazda

Ginste

Rogier

et al. 2011

2011 IEEE 15th Workshop on Signal Propagation on Interconnects (SPI)

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A technique to efficiently reduce differential-to-common mode conversion occuring at a bend discontinuity in coupled microstrip lines is investigated. Total signal integrity in the interconnect structure has been improved by minimizing the differential reflection coefficient and insertion loss simultaneously. This is achieved by changing the geometry of the microstrip lines via a tapering section to tightly or very tightly coupled ones in the area of the bend. The new design was manufactured, measured, and validated by means of time-domain analysis, providing very satisfactory results. IntroductionDifferential signaling is a popular way to transmit signals across circuit boards because of its high electromagnetic immunity against conducted and radiated interfering signals [1]. However, when applied, it is important to keep the differentialto-common mode conversion level low, as this phenomenon has a strong influence on the signal integrity [1][2][3][4][5]. The emergence of new technologies, leading to high bit rates, short rise times and small noise margins, makes this requirement even more stringent. Unfortunately, conversion easily occurs, due to signal trace length mismatch [6] or asymmetric discontinuities in the circuit layout, and in particular at a bend of coupled microstrip lines [2,4, 5]. A reduction of the unwanted common-mode noise can be obtained by applying filtering structures [4, 5] or by adding extra compensating capacitance [2].In [5], a new approach was presented to reduce conversion noise caused by a bend discontinuity over a large frequency range (from DC to 6 GHz), while maintaining low reflection and insertion loss. Whereas in [5] the focus was on frequencydomain S-parameters simulations and circuit modeling, here, we investigate the behavior of improved bends in time domain by means of measurements. Such time domain analysis provides valuable signal integrity related data for circuit designers.

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EMI evaluation of a differential signaling interconnect at 3.2 Gbps

Shi

Echevarria

Beyene

et al.

IEEE 14th Topical Meeting on Electrical Performance of Electronic Packaging, 2005.

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EMI common-mode current dependence on delay skew imbalance in high speed differential transmission lines operating at 1 gigabit/second data rates

Cited by 10 publications

References 2 publications

Noise Reduction Using Compensation Capacitance for Bend Discontinuities of Differential Transmission Lines

Noise Reduction Using Compensation Capacitance for Bend Discontinuities of Differential Transmission Lines

Time domain analysis of a wideband common-mode suppression filter for bent interconnects

EMI evaluation of a differential signaling interconnect at 3.2 Gbps

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