Common-mode noise reduction schemes for differential serpentine delay microstrip line in high-speed digital circuits

Shiue, Guang-Hwa; Tsai, Yi-Chin; Shiu, Jia-Hung

doi:10.1109/epeps.2011.6100229

Cited by 6 publications

(12 citation statements)

References 6 publications

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“…An ideal differential ramped step source with a magnitude of ±1V and a rise time (t r ) of 50ps is now driving the DSDML. Although the dual back-to-back VTCTs do not introduce a length difference between the two traces of a DSDML, similar to dual back-toback coupled bends in differential traces [5], the commonmode noise is not completely compensated by the VTCTs [4]. The contributions to the common-mode noise originate from the mismatch of the trace lengths of the individual VTCTs, the length of the parallel differential coupled traces between two VTCTs and the crosstalk between the parallel pairs of differential coupled lines [4].…”

Section: Statement Of the Problemmentioning

confidence: 99%

“…So, no thorough theoretical analyses or measurement results are yet presented. By extending the results of [8], the recent paper thoroughly investigates the common-mode noise reduction schemes for a weakly coupled DSDML. First, the common-mode noise reduction is analyzed in the time-domain by studying the transmission waveform using the circuit solver HSPICE.…”

Section: Introductionmentioning

confidence: 97%

“…Hence, during the design of state-of-the-art electronic systems, reducing the common-mode noise induced by differential interconnects, is crucial. In a differential serpentine delay microstrip line (DSDML), the main contributions to commonmode noise originate from the length mismatch of the verticalturn-coupled traces (VTCTs), the length of the parallel differential coupled traces, and the crosstalk between the parallel pairs of differential coupled lines [4]. In recent literature, several approaches to reduce the common-mode noise induced by differential bends have been proposed, such as adding capacitance to deal with the bend discontinuity [5] or by using tightly coupled microstrips [6].…”

Section: Introductionmentioning

confidence: 99%

“…In a previous study [8], noise reduction schemes were developed for a weakly coupled DSDML by adopting strongly coupled VTCTs instead of the weakly coupled VTCTs (conventional pattern) and adding guard traces, as shown in Fig. 2(b).…”

Section: Introductionmentioning

confidence: 99%

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Common-Mode Noise Reduction Schemes for Weakly Coupled Differential Serpentine Delay Microstrip Lines

Shiue

Kao

Tsai

et al. 2013

IEEE Trans. Compon., Packag. Manufact. Technol.

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Abstract-This work proposes design schemes to reduce the common mode noise from weakly coupled differential serpentine delay microstrip lines (DSDMLs). The proposed approach is twofold: we leverage strongly coupled vertical-turn-coupled traces (VTCTs) instead of weakly coupled VTCTs (conventional pattern) and add guard traces. Time-and frequency-domain analyses of the proposed schemes for reducing the common-mode noise are performed by studying the transmission waveform and the differential-to-common mode conversion using the circuit solver HSPICE and the 3-D full-wave simulator HFSS, respectively. Compared to the conventional design of the weakly coupled DSDMLs, the proposed solutions yield a reduction of about 54% of the peak-to-peak amplitude of the common-mode noise, while the differential impedance remains matched along the complete length of the DSDML. Moreover, the range of frequencies over which the magnitude of the differential-tocommon mode conversion is now significantly reduced, is very wide, i.e. about 0.3~10GHz. Furthermore, the differential insertion and reflection loss introduced by the newly proposed designs are almost the same as the ones achieved by using the conventional design. Finally, a favorable comparison between simulated and measured results confirms the excellent commonmode noise reduction performance of the proposed schemes.Index Terms -Differential serpentine delay microstrip line, common-mode noise, guard trace, differential-to-common mode conversion, differential reflection loss, differential insertion loss.

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Section: Statement Of the Problemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Common-Mode Noise Reduction Schemes for Weakly Coupled Differential Serpentine Delay Microstrip Lines

Shiue

Kao

Tsai

et al. 2013

IEEE Trans. Compon., Packag. Manufact. Technol.

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“…[2][3][4][5][6][7][8][9][10][11] The taper bend discontinuities and meander delay line as equi-distance routing technique have been proposed to improve and compensate SI performance. But the papers have mainly focused on SI issue.…”

Section: Introductionmentioning

confidence: 99%

Locally Shielded Differential-Paired Lines with Bend Discontinuities for SI and EMI Performances

Kayano

Ohkoshi

Watabe

et al. 2014

Transactions of The Japan Institute of Electronics Packaging

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To provide the basic considerations for EM radiation from practical asymmetrical differential-paired lines with bend routing, this paper newly attempts to propose locally shielded differential-paired lines for establishing SI performance and suppressing imbalance component and EMI generated by differential-paired lines with bend (called as turnoff point) discontinuities. The conductive plane is placed on discontinuity region asymmetrically. The concept of locally shielded layout is based on compensation of phase-difference due to the bend discontinuities, by using electric-coupling between signal trace and a conductive plane for the shield. The proposed method is suitable for implementing on PCB, without changing layout of the differential-paired lines. To compare the effect of the locally shielded paired-lines on CM component, the |S cd21 |, which is defined as the conversion from DM to CM, are evaluated. The significant suppression effectiveness of |S cd21 | in the case study is achieved below 1 GHz by locally shielded differential-paired lines. Consequently, the validity of the proposed locally shielded layout is demonstrated. It is demonstrated that the proposed locally shielded layout is suitable for improving the SI performance and suppressing the CM in the case study. This study has successfully reported the basic method for suppressing imbalance component of differential-paired lines with bend discontinuities.

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Differential Serpentine Delay Line Using Strongly-Coupled Turns with Timing-Offset Differential Signal

Yeh

Wang

2019

2019 Electrical Design of Advanced Packaging and Systems (EDAPS)

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Common-mode noise reduction schemes for differential serpentine delay microstrip line in high-speed digital circuits

Cited by 6 publications

References 6 publications

Common-Mode Noise Reduction Schemes for Weakly Coupled Differential Serpentine Delay Microstrip Lines

Common-Mode Noise Reduction Schemes for Weakly Coupled Differential Serpentine Delay Microstrip Lines

Locally Shielded Differential-Paired Lines with Bend Discontinuities for SI and EMI Performances

Differential Serpentine Delay Line Using Strongly-Coupled Turns with Timing-Offset Differential Signal

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