Novel Differential-Mode Equalizer With Broadband Common-Mode Filtering for Gb/s Differential-Signal Transmission

• Published in: IEEE transactions on components, packaging, and manufacturing technology (2011) Vol. 3; no. 9; pp. 1578 - 1587
• Main Authors: Cheng, Yu-Jen, Chuang, Hao-Hsiang, Cheng, Chung-Kuan, Wu, Tzong-Lin
• Format: Journal Article
• Language: English
• Published: Piscataway IEEE 01.09.2013; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Attenuation; Broadband; Circuits; Common-mode suppression; Coplanar waveguides; Design parameters; differential-mode equalizer; equalization; Equalizers; Equivalent circuits; Filtering; frequency-dependent loss; High speed; high-speed differential transmission; Integrated circuit modeling; Optimization; Printed circuits; Propagation losses; Receiving; signal integrity (SI)
• ISSN: 2156-3950; 2156-3985
• DOI: 10.1109/TCPMT.2013.2246275

In high-speed differential signal transmission, signal integrity at the receiving end is mainly determined by high quality of the differential-mode signal and good suppression of the common-mode noise. In this paper, an innovative circuit with dual function of the differential-mode equalizer and common-mode filter (DME-CMF) is proposed. The differential-mode and common-mode characteristics of the proposed structure are discussed separately with their corresponding half-circuit model. Based on the proposed design methodology for the DME-CMF and the presented structure realizing the DME-CMF with a two-layer printed circuit board, a set of design parameters are determined for 8-Gb/s differential transmission and utilized in the fabrication of test boards. The frequency-domain and time-domain measurements of the test board successfully demonstrate the effectiveness of the proposed structure.