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November 10, 2013

Mtg: Gigahertz Common-mode Filter for 10-Gbit/s Differential Signaling

by @ 9:51 am. Filed under ALL, Communications, Electronics Design, Semiconductors
 

THURSDAY November 14, 2013
SCV Microwave Theory and Techniques Chapter
Speaker: Miroslav Pajovic, RF/Microwave and EMI Consulting Engineer
Time: Presentation at 6:00 PM
Cost: none
Place: Agilent, 5301 Stevens Creek Blvd, Santa Clara
RSVP: not required
Web: meetings.vtools.ieee.org/meeting_view/list_meeting/20829

In addition to the desired differential signals, the undesired and EMI harmful common-mode noise may propagate along differential signal lines.  Conventional common-mode filters such as ferrite chokes – which work well in lower frequencies below 1 GHz â?? have limited effectiveness in the gigahertz frequency range.  To suppress critical common-mode in this frequency range without degrading the quality of the differential signals, a gigahertz common-mode filter structure is proposed.  This design is directed to a compact-size electromagnetic band gap (EBG) structure suitable for placement in a multilayer PCB, individual IC chip package, or in an optical transceiver module.  The filter provides common-mode suppression for 10-Gbit/s differential signal lines for the frequencies 10.3125 GHz and 20.625 GHz, where common-mode noise is highly problematic.

20131114scv

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