Esd Noise Suppression Using Series Rc Filters - Intel Quark SoC X1000 Design Manual

The effectiveness of this series RC-filter is shown in
sharp peak is effectively reduced by 75% with the series RC filter. The filter has
significant impacts on ESD robustness, since this sharp peak contains huge amounts of
high-frequency components and is typically the origination of most problematic
symptoms in the system. This filter can also suppress the ringing of ESD noise on the
transmission line. Typically asynchronous nets are terminated with small capacitance
instead of 50- load. This causes impedance mismatch and thus ringing, especially for
long traces. Ringing contains high-frequency components and increases local peak-
voltage. It may degrade ESD robustness of the system. It has been demonstrated in
Figure 79
The impact of the series RC filter to signal integrity is analyzed in
and falling edges of the signal remain relatively fast with the presence of the series RC
filter. The rising time is about 2.84 ns, measured from 30% to 70% of the signal level.
This is sufficiently fast for most of asynchronous nets. One drawback of this filter is that
the duration required to reach 99% of the signal level is about 10 s. However, for
operation of typical digital circuits, this has negligible impacts because reaching 99% of
the signal level is not required.
Figure 79.

ESD Noise Suppression Using Series RC Filters

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Intel Quark™ SoC X1000
PDG
132
that the ringing is significantly reduced with the series RC filter.
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Intel Quark™ SoC X1000—Electrostatic Discharge (ESD)
Figure 79. The magnitude of the
Figure 80. The rising
June 2014
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