Trends
Electronic Military & Defense Annual Resource, 6th Edition
37
The aforementioned engineer's concerns proved
valid, and he was tasked with creating alternative
implementations, simulating and comparing the results
to identify the best alternative. As the original design
was implemented in a PF tool, the engineer was
able to create derivatives and identify the best
alternative given the constraints. A
new solution was identified, and
the original implementation team
was used to relayout using the
new design guidelines. A delay to
manufacturing was shortened by
using PF. A similar noise example is
depicted in Figure 1.
Following application of the PF
process, Figure 2 depicts the end
result, split into Case 1 and Case
2. Case 1 has dedicated return
paths for each transmission line,
while Case 2 (created from Case
1) has all return paths grouped
together. Ultimately, Case 1 offers
~20dB noise improvement for both
Near End (NEXT) and Far End
(FEXT) over Case 2. More variables
could have been added, such as
metal topology, pitch of metals,
various shielding alternatives,
etc., to explore which alternative
resulted in the best noise immunity.
Insertion loss (IL) is not shown, but
also should be analyzed.
This SI/PI example focused on
cross talk and RDL, but PF can be
used for silicon, PCB, and complex
2.5/3D packaging to determine:
• How uVIAs (or TSV/TGVs)
can be arrayed and signal/
power assigned to each uVIA
to minimize insertion loss
(IL), as well as cross talk
(NEXT and FEXT)
• How material properties
affect electrical performance
(silicon or PCB)
• How various 2.5D or 3D
structures will perform
with defined interconnect
technologies (balls, pillars,
wire bonds, etc.)
• How to optimize power
distribution networks (PDNs)
to achieve target impedance
and optimize a system's
performance.
2
Differences Between Commercial
And Military Designs
Integrated device manufacturers that produce both
commercial and military products, in an effort to avoid
creating two different designs, simulate product use
based on the more challenging military requirements.
Reliability
isn't an
option – it's a
requirement.
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