PDN requirements and impedance
Review load assumptions, supply constraints and the impedance objectives used to assess the power distribution network.
02 / POWER INTEGRITY
Power integrity & PDN analysis.
Confidence in power delivery.
Power integrity is about delivering the required supply behaviour at the devices that need it. ASTRX supports power distribution network (PDN) analysis, decoupling strategy and review of the assumptions behind a digital design’s power delivery.
Discuss a power integrity review ↗THE ENGINEERING QUESTION
When supply behaviour puts the design margin in question
The behaviour of a power network depends on the interaction of its sources, planes, interconnects and components. Adding capacitance alone does not explain whether the network meets its requirements. A useful investigation begins with the load assumptions, relevant frequency range and a clear engineering target.
POWER DELIVERY IN CONTEXT
Support the switching load.
Control the supply noise.
Experience with high-bandwidth serial platforms and DDR / LPDDR memory brings the power distribution network into the wider system discussion. Interface behaviour, simultaneous switching and power delivery need to be considered together.
The focus is on the engineering choices behind a robust supply: current paths, decoupling placement, impedance and resonance behaviour. Findings are tied to design constraints and a verification plan that can be carried through to hardware.
AGREE ON SCOPE / ALIGNED AROUND YOUR DESIGN
What we can investigate.
Decoupling and resonances
Investigate component choices and placement assumptions, network resonances and the sensitivity of the model to the available component data.
Design decisions and follow-up
Compare practical options and prioritise changes, while identifying the measurements needed to connect the analysis with real hardware behaviour.
GET STARTED
Useful inputs.
- Supply requirements, relevant load assumptions and existing design targets
- Available schematics, board stack-up and power-plane information
- Decoupling component details and models where available
- Measurements or operating conditions associated with any known issues
THE HANDOVER
Usable outputs.
- A documented PDN analysis approach and its boundaries
- Findings on impedance, decoupling choices or resonances within scope
- Comparison of design options and prioritised recommendations
- Measurement and validation questions for the next design iteration