A novel dual-functional structure integrating differential-mode equalizer with common-mode filter for Gbps signaling

In this paper, an innovative passive equalizer that is also able to filter common-mode noise is proposed, which is realized based on a via-conducted coplanar waveguide structure with resistive load (VCPW-R) formed on the ground plane. The proposed structure is low cost, compact and easily designed. Based on the analyses of the odd mode and even mode, a co-design flow is established, with which a set of design parameters are determined for 10 Gbps differential transmission and utilized in test-board fabrication. The effectiveness of the proposed structure is validated by the frequency-domain measurement result and time-domain simulation result of the test board.