IEEE EMC Society Sendai Chapter  会員各位

                 IEEE EMC Society Sendai Chapter Chair  井上 浩

Chapter共催 Tzong-Lin Wu先生(国立台湾大学教授)講演会開催のご案内

下記により,講演会を開催しますので,ご案内申し上げます.

懇親会(19:15〜20:30,会費3000円)へのご参加は,15日までのご連絡を
お願いいたします。

記

日時 2010年3月18日(木)18:00〜19:00
会場 東北大学 サイバーサイエンスセンター 講義室
   (仙台市青葉区荒巻字青葉6−3)
講演
Broadband Common-mode Filters Design for GHz Differential Signals
Using Defected Ground Structures
Prof. Tzong-Lin Wu (National Taiwan University)

Abstract:
Differential signals have played an important role in high-speed digital
circuits because of their high immunity to noise, low crosstalk, and low
electromagnetic interference (EMI). Several high-speed serial link
formats, such as PCI Express II, Gigabit Ethernet, or OC-192, have the
data rates over 5 Gb/s under the differential signal transmission.
However, in practical circuits, the common-mode noise due to the timing
skew or amplitude unbalance along the differential signal paths is
unavoidable. In this talk, a novel GHz common-mode filter is proposed
based on the coupled defected ground structures. The basic theory of the
defected ground effect on the common-mode signals is first explained. The
wideband behavior using three coupled defected ground structure will then
be shown. The benefits of the common-mode filter applied in GHz
differential traces with cables attached are both theoretically and
experimentally demonstrated. It is found the common-mode noise can be
reduced by the filter over 15 dB from 3.6 to 9.1GHz and over75% of
amplitude in the time domain. More important, the differential signal
integrity, in terms of insertion loss and group delay in the frequency
domain and eye diagrams in the time domain, is not degraded within the
wide bandwidth. The radiation caused by the common-mode current on the
attached I/O cables is also efficiently suppressed by 10 dB on average
within the designed stopband.

共催:IEEE EMC 仙台チャプタ,東北大学EMC仙台ゼミナール