aaron_do
|
Hi,
The result seems a little odd to me. For the 0.5 turn case, I thought there would be much more change in the series resistance and inductance as the radius increases. What equation did you use to calculate inductance and resistance? Maybe your width is scaling with the inner radius?
Also, from memory (its been a while since I looked at inductors), the smaller inner radius values seem a little too small (15 um?). If you roughly assume about 0.75 nH per mm (from memory, this is roughly correct for straight lines), a half turn with 15 um radius would be pi*0.015*0.75n = 0.03nH. But according to your plot, the inductance is around 2.5/(2*pi*1.5e9) = 0.265nH. So my rough estimation is one order of magnitude off.
Another thing, 3um seems a little narrow to get good Q unless your metal is extremely thick...
Sometimes you cannot do parametric sweeps on PDK models. You might need to plot your data one step at a time.
regards, Aaron
|