Lezing van IEEE EMC Distinguished lecturer.
Cees Keyer
prof dr. Tzung lin Wu.
De onderwerpen zijn (Engels):
Power Integrity Design for High Speed Circuit Packages
With the trend of fast edge rates, high operation frequencies, and low
voltage in
high-speed or high-frequency circuits, power/ground noise caused by
simultaneously
switching currents has become one of the major concerns for high-speed or
mixed-signal circuit designs. In this talk, the fundamental concept for
the power
integrity (PI) design is first introduced, including the power
distribution network
(PDN) and its impedance, the mechanism of the power noise, and the design
issues
caused by the power noise. Several commercial solutions to suppress the
noise, such
as SMT capacitors, embedded capacitor, and on-chip capacitors, will be
presented.
Recently, electromagnetic band gap (EBG) structures are proposed to be an
alternative approach for power noise suppression. Several novel
electromagnetic
bandgap (EBG) structures with efficient noise suppression capability will
also be demonstrated in this talk.
2de onderwerp:
Broadband Common-mode Filters Design for GHz Differential Signals Using
Defected Ground Structures
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.
De lezing is vrij toegangkelijk.
Wordt gehouden in het Auditorium van de TU/E
Zaal AUD02
Donderdag 18 juni
13.30-17.00u
Namens de IEEE BeNeLux EMC chapter
Cees Keyer.
Gaarne opgeven bij cees(ditniet)@(ditookniet)ieee.org