Via size and spacing

[rd_dinesh]

I'm designing a power amplifier on an RT6006 board,
I want to place vias in my design, I want to know how we can decide the size and spacing between the vias.

 

[barry]

Okay, WHY do you want to place vias? For heat transfer? For routing between layers? Because you just like vias?

 

[rd_dinesh]

Okay, WHY do you want to place vias? For heat transfer? For routing between layers? Because you just like vias?

for grounding the capacitors(i.e, routing between the layers)

 

[D.A.(Tony)Stewart]

Via defects are difficult to repair / detect (see link), so consult with PCB shop on best practice re: redundant holes , low inductance, plasma etching etc all affect performance. Microdrill with carbide or laser drill preferred. Reducing height/diameter ratio affects nH/mm on a log scale. nominal 0.6 nH/mm for path length.

https://www.rogerscorp.com/-/media/...006-6010-high-frequency-circuit-materials.pdf

 

[barry]

for grounding the capacitors(i.e, routing between the layers)

What current? What frequency? There are lots of free tools out there to help you calculate appropriate size. You've given us no inormation. Just search
"Via suze calculator"

 

[rd_dinesh]

What current? What frequency? There are lots of free tools out there to help you calculate appropriate size. You've given us no inormation. Just search
"Via suze calculator"

currents through various capacitors in two different modes of operation.

 

[D.A.(Tony)Stewart]

Keep in mind every trace and via adds about 1 Ohm/mm per GHz based on ESL of 0.6 nH/mm for path length.

So be aware why your Vdd noise spikes dV=Ic*dt/C and how damping works in simulations from impulse transitions. ( drivers )

If you do not know how to simulate it. Find out.