Powering FPGA with 2 layer board?

[gongdori]

Hi all,

I want to build a simple circuit with a FPGA. I initially thought about building 4 layer board, but later learned that it would be very expensive.
The FPGA I want to use requires 3 voltage rails... I wonder if it would be possible to be done in 2 layer board?
The circuit will have 1) FPGA, 2) USB-UART converter, 3) PROM for FPGA, 4) RS232 line driver, 5) buffers for JTAG, 6) multi-channel ADC

Also, does anyone know where to build a cheap prototyping board?
Thanks,

Thomas

 

[shaiko]

That's a very low quality solution.

Of course you won't be able to use BGA FPGA's. But also, you'll have very difficult time achieving reasonable signal integrity while maitaining stabe power integrity.

I strongly suggest that you go for a 4 layer design.

--signal--
--power--
--ground--
--signal--

 

[gongdori]

shaiko,

Thank you for your reply.
I was afraid because 4 layer board was alot more expensive than 2 layer board. I wonder if there is anywhere i build it in good price?
Thanks,

Thomas

 

[shaiko]

Try this web site
It's very popular with acceptable quality.
http://www.pcbexpress.com/

 

[RCinFLA]

Don't be penny wise and pound foolish. The cost of most FPGA's dictate not scrimping on PCB design.

 

[gongdori]

Thank you for your advice. But, the cost of PCB dictates in this design... It's for fun. :smile: