Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
9 years ago

CycloneIV VCCD_PLL Decoupling

Hi, what is the appropriate ground connection for the VCCD_PLL pins? None of these have GND pins nearby in the E22 package, but the name suggests that this is a digital pin, so it is refer...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
9 years ago

Agree with the suggestions by rsefton, in addition I would use smaller via sizes and probably 0402 bypass capacitors, but power supply traces rather 0.3 than 0.2 mm for lower inductance.

The good point with your design is placing one bypass capacitor per supply pin.