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Altera_Forum
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14 years ago

Power supply[PCB-dev.]-Cyclone IV

Hi. I have some questions regarding power supply for an Altera Cyclone IV. The FPGA will be powered by a li-ion battery (Vout is between 4,0 – 3,1). Since the battery could go below 3,3V m...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

The power-supply design is now finished. I have uploaded the pictures of the schematics. All the “free” capacitors in the upper parts of the pictures will be placed close to the FPGA.

My question is now, is it nessesarry to have the filter for VCCINT? How should it be design, what value of the ferrite bead (F1_L1) and capacitor (RC1_C1) should I have?

I now I have specified the Impedance @ Frequency of the bead to 10 ohm @ 100 MHz but that is a guess.

Thanks for all the help so far guys!

http://imageshack.us/photo/my-images/819/vcca.png

http://imageshack.us/photo/my-images/857/vccd.png

http://imageshack.us/photo/my-images/163/vccint.png

http://imageshack.us/photo/my-images/688/vccio.png

Sorry had problems embedding the pictures!