[SI-LIST] Compute plane cutout distance

  • From: bala <balaseven@xxxxxxxxx>
  • To: "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
  • Date: Mon, 7 Jul 2014 17:22:43 +0530

Hi All,
I can simulate and observe how far the reference plane should be from Ac
coupling capacitor’s mounting layer to shun impedance discontinuities.


Is this workable by hand …


Sqrt (L/C) is my characteristic impedance and area/distance is my
capacitance.

If I am able to compute cumulative inductance, then I can quickly see the
capacitance to get 50 ohm impedance, consequently, I can get my plane cut
out distance.

My question is how to calculate the cumulative inductance of DC blocking
capacitor.

Is my ESL and parasitic inductance sufficient? Or should I consider
solder+vias (if any) also.


Any other implication?


Regards

bala

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