Does the PDN Tool Take DC Bias Loss Into Account?

[Ian_Maw]

Hi,

I worked in a company where someone did not account for loss of capacitance due to DC bias and the boards were unreliable for that reason.

I used the Cyclone V PDN tool to calculate the required values but I am not 100% certain whether or not the tool compensates for this factor.

Thanks.

[FvM]

Hi,
PDN tool doesn't even use capacitor rated voltage, how should it consider C/V characteristic? Obviously, it's up to the designer to put in effective capacitance.

[Ian_Maw]

Thanks, although your attitude is less than pleasant.

[FvM · Accepted solution]

Accepted. Let's say, PDN tool has no features to take account of capacitor voltage rating. Even if you know it, effective capacitance of different high Er capacitors at 0.5*Vrated ranges between 30 and 80 % of nominal capacitance.

[Ian_Maw]

Thank you very much.