karesz said:Hi eziggurat,
Tnx a lot for your nice info!
Yes, price is surly a problem, but yours projejt is(must be) coming from basic research, or for that developed., becouse the people with 18 layers are surly some luxourious...
I have studied in past year a layout realisation for Spartan 3 project, in FG676 package, inmy opinion it is good to realizable with max 10-12 layers, in our case it becames 8 layers, but we didnt need more as 50% of the pins...
If the pinout of the PGAs good/Iintelligent designed, you has chance to work with pads Nr. of up to ca. 1K(!) with at i.e.12 layers...,but in our digiscope project to, are the must pins not neede, only the much gates, so I believe, that the PCB will be possible not complexer as i.e. 8 layers.
In my opinion is ML(Multi Layer) welcome, but not over all!Nowadays is a board w. 8-layers, not so cheap, but a relative "industrie standard".
K.
You see, I dont have some problem with them if you says "its a very complex and sensitive PCB-system", I have similars in my praxis too_I can imagin iteziggurat said:...I don't really know what you are talking about when you mention basic and luxurious when you having even seen the final product. ... one of the best 100 products in mid 2000 by notable electronic magazine and the company is still producing the goods. Believe me it is cutting edge technology not basic research.
But for the hobbyist digital scope you won't be designing something similar to these boards. It will depend on what components that you are using.
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