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Reducing the parasitic capacitance of device by adding ground plane
Posted 5 ago 2016, 22:04 GMT-4 0 Replies
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1) First question regarding the capacitance of a parallel plate capacitor (PPC). So , we encompass our capacitor within a large box and then compute it. So, the way I understand COMSOL computes the capacitance is that it calculates the total energy associated with the field and then gives us capacitance.
So, my query is, when we want capacitance between the plates only then does the software also include the energy of fringing fields? I think it should exclude those fringing fields. But, I am not sure!
2) Secondly, We have to specify ground and terminal boundaries to calculate the capacitance. So, in that case we will assign one of the plates some potential and zero to the other one.
So, Now I want to see what will happen to the intrinsic capacitance the parallel plate capacitor when I have two ground planes surrounding the plates of capacitor?They are not touching any of the plates.
Moreover, how do the add those ground planes? It should hopefully mitigate the intrinsic capacitance of PPC .
But I knew no way to add that condition, So added those ground planes to ground boundaries of capacitor. Which I think is wrong! And it increased the capacitor as I have increased the area of ground boundaries.
So, Please help me in this regard.
Hello Rohit Kumar
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