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What is the difference between plane and conductor layers?

JJJin

Hi, 

I am working on a 4 layers pcb with allegro, and Top Bottom are for signals, middle two layers are ground. I tried to use impedance value given by allegro, but there is a big difference if I set middle layers as conductor or plane in stack. 

I don't understand why the change of denfinition can result such a difference, I mean anyway, it still is a layer of metal. From manufacturing side, I couldn't see a difference if I define it as conductor or plane.

I assum the calculation of impedance is carried out differently, but exactly how, could someone give some ideas?

Thanks !

BR  Jin

  • Schulz Jordan
    0

    Both conductor & Planes are copper layers. The main difference is the planes have copper flooded completely while in signal layer that's not the case. Some blogs on cadence has detailed explanation. 

  • JJJin
    0 in reply to Schulz Jordan

    Thank you Schulz, do you mean conductor copper layer usually doesn't have copper poured on the whole area, instead only signal traces on it ? So in that case, the copper above it will have a different GND reference?

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