The Definitive Guide to an Electronic Assembly Design Review / 18
Design Review Examples
Ansys has worked with numerous companies to
provide design reviews of electronic products and
components that help our customers revise their
design plans to create highly successful products with
longer life cycles.
For example, in the adjacent figure, Ansys determined
that a switch node within a client's PCB would
capacitively couple to any nearby traces, planes and
even the chassis. This occurs when the digital ground
plane resides under the switch node, resulting in
current that will flow into the digital plane and back to
the ground on the power supply integrated circuit (IC),
causing the digital ground to be noisy. In addition, the
node may magnetically couple into circuits, causing
disruption.
Our design review helped our client determine design
errors that would potentially lead to product failure.
Additionally, we provided key recommendations for
improving the overall design plan and circuit layout
which included ground plane and signal layer
configuration to obviate the crosstalk.
Switch Node
Has high dV/dt
Vout Plane
Quiet
Loop Current
Has high
f requency
current
PGND Plane
Quiet
Example 1
