Display Your Know How: Placement

B

None of the pictures. Electrical properties need to be considered.

 A very valid point! Thanks excellon1!

A key point here is, what do you prioritise in your typical designs? As PCB designers, we are often forced to be the "middle-person" with the responsibility to choose between often-conflicting requirements. So ultimately the question remains; as a designer what do you consider to be the top priority?

Let's see what other designer have to say...

 A very valid point! Thanks excellon1!

A key point here is, what do you prioritise in your typical designs? As PCB designers, we are often forced to be the "middle-person" with the responsibility to choose between often-conflicting requirements. So ultimately the question remains; as a designer what do you consider to be the top priority?

Let's see what other designer have to say...

Planes deliver the best low impedance conductor on your PDN network.  Traces always add parasitic inductance.  Trace impedance probably won't dominate package impedance of the bypass cap.  Looking at PDN as cumulative (series inductance) seems to work.     

Via-in-pad to a plane delivers the ultimate PDN solution. 

But, placing plane vias close to device pins is defensible in a design review.

https://www.sigcon.com/Pubs/news/9_07.htm

https://learnemc.com/decoupling-for-boards-with-closely-spaces-power-planes

Hi there.

The most critical things as a designer I have found over many years are.

1 Having a competent engineering team that knows their stuff is a huge benefit.
2 Cost / Quality of end product.
3 Time to complete including an objective of "No Board Re Spins. aka Day 1 ready.

From a technical perspective, I agree with Robert, PDN very very important. Placement also highly important. 
One other area often over looked is how to get the heat out of the box so thermals really really important in particular
if using power hungry semiconductors.

When doing your design keep as much copper on the board as you can. Copper pours and planes everywhere. Always
think about minimal inductance for PDN. More copper on the board means your board will be more rigid. !

Simulation of both RF and PDN depending on the product can be highly valuable. PDN support in Allegro/Orcad.. Very good !
Learn the tools... !

All the best.

Excellent effort, everyone! You raise some very excellent points. Thank you for sharing your great experience within this quiz. We deeply value each view and would love to hear from other passionate members of the community.