Noise reduction using compensation capacitance for bend discontinuities of differential transmission lines

• Published in: IEEE transactions on advanced packaging Vol. 29; no. 3; pp. 560 - 569
• Main Authors: SHIUE, Guang-Hwa, LIN, Chien-Min, WU, Ruey-Beei
• Format: Journal Article
• Language: English
• Published: Piscataway, NY IEEE 01.08.2006; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Applied sciences; Capacitance; Circuit noise; Circuit simulation; Common-mode noise; Compensation; compensation capacitance; Computer simulation; Coupling circuits; Design. Technologies. Operation analysis. Testing; differential signaling; Digital circuits; Discontinuity; Distributed parameter circuits; dual back-to-back coupled bends; Electronic equipment and fabrication. Passive components, printed wiring boards, connectics; Electronics; Equivalent circuits; Exact sciences and technology; Integrated circuits; mixed-mode; Noise; Noise reduction; Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices; Signal generators; signal integrity; strongly coupled differential line; Transmission line discontinuities; Transmission lines; Low noise circuit; Shunt; Noise reduction; High-speed integrated circuits; Coupled line; Receiver; mixed-mode S-parameters; strongly coupled differential line; signal integrity; Transmission line; Time domain method; s parameter; compensation capacitance; Equivalent circuit; Capacitance; Coupled circuits; Noise immunity; S wave; differential signaling; dual back-to-back coupled bends; Comparative study; Common-mode noise; discontinuity
• ISSN: 1521-3323; 1557-9980
• DOI: 10.1109/TADVP.2006.875413

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 S-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