On 25.10.24 17:57, Luke Vogel wrote:
> I'm drawing up a Low Pass Filter for a HF power amp.
> The topology of the filter requires some parallel capacitors to achieve the required capacitances.
...
> Below is the type of footprint I'd prefer to use ...
> My question is; What is the best way to achieve a clean PCB design and still have a comprehensive BOM?
If the depicted 4x1206 assembly is in your library as a single
component, then I'd just set its value to: 100pF + 47pF + 47pF + 22pF
and add a line of e.g. awk to split that up into 4 components on BOM
generation. (Your arithmetic has them all in parallel, so placement is
arbitrary within the assembly, I figure.)
Mind you, if hand assembling a small number of units, I'd also consider
just stacking them in a small layer cake, if soldering didn't become too
fiddly. It seems easier to avoid adding stray capacitance while tweaking
to the nearest pF, if unnecessary copper areas are avoided.
Erik
