Power integrity is more than selecting or adding decoupling capacitors by rule of thumb. The available information indicates that these simple practices are no longer sufficient on their own as IC processes reach gigahertz levels.
This affects more than the highest-speed designs. Even circuitry described as lower speed needs greater care, so power-related decisions should not be treated as an automatic capacitor-placement exercise.
Summary: Simple decoupling-capacitor rules of thumb are no longer enough by themselves. Gigahertz-level IC processes raise the need for careful power-integrity work. Lower-speed circuitry is also affected. Power integrity has been described as less mature than signal integrity.
What does it mean that power integrity is more than decoupling capacitors?
It means decoupling capacitors should not be treated as the complete answer to a power-integrity question. The source specifically states that the era when simple decoupling-capacitor rules of thumb were effective has passed.
That statement does not say that decoupling capacitors are unnecessary. Rather, it sets a limit on a simplified approach: using familiar rules without further care is not presented as adequate for current circuitry.
Why are simple decoupling-capacitor rules of thumb no longer enough?
The stated reason is the move of IC processes toward gigahertz levels. As those processes reach these levels, the source says that circuit work requires more care than it did when simpler rules could be relied on.
No particular capacitor value, layout method, measurement method, or performance target is provided. Therefore, the practical conclusion supported here is limited: teams should avoid assuming that a generic decoupling rule fully addresses power integrity.
Do lower-speed circuits need power-integrity attention?
Yes. The source directly says that even lower-speed circuitry needs more care than ever before as IC processes reach gigahertz levels.
This is important because a lower-speed label does not, by itself, justify relying solely on older capacitor rules of thumb. The need for care is linked to the IC-process context described in the source, not only to the apparent speed of the surrounding circuit.
How is power integrity compared with signal integrity?
A power-integrity researcher and practitioner, Steve Sandler, is quoted as describing the field of power integrity as about 15 years behind signal integrity. This is presented as an assessment of field maturity, rather than a measured specification for a particular product or design.
| Area | Comparison stated in the source |
|---|---|
| Power integrity | Described as about 15 years behind signal integrity. |
| Signal integrity | Used as the reference field in that comparison. |
The comparison suggests that power integrity deserves focused attention as a discipline. It does not establish a universal performance difference between individual power and signal designs.
What is a reasonable takeaway for electronics manufacturing teams?
A reasonable takeaway is to treat power integrity as a design concern that needs deliberate consideration, rather than reducing it to a standard decoupling-capacitor checklist. This applies even when the circuit is considered lower speed.
The supplied information does not provide a prescriptive workflow or component-selection criteria. For that reason, it supports awareness of the limitation of simple rules, but it does not support claiming a specific implementation method or outcome.
Note: The “about 15 years behind” statement is an attributed professional assessment. It should not be read as a product specification, certification, or quantified result for an individual electronics assembly.
When should a decoupling-capacitor rule of thumb be questioned?
It should be questioned when it is being used as the only basis for addressing power integrity. The source’s central point is that simple rules of thumb alone are no longer effective in the context of IC processes reaching gigahertz levels.
Questioning the rule does not require rejecting decoupling capacitors. It means recognizing that the presence of capacitors, or adherence to a familiar rule, does not by itself settle the broader power-integrity need described here.
