I have generated a inductor Ind1 with a Passive Component Designer
(PCD) tool. The inductor is used in LC VCO schematic.After LVS run I
get the following errors and discrepances:1)Error:
Ind1(Generic) on Schematic is unbound to any layout device2)in
LVS report I get that pins of the inductor are not found in layout,
although seen in schematic by the tool.
I tried to solve problems by:
- adding a line in bind.rul file : 'C Ind1(Generic) Ind1'
what eliminated the error 1), but in the LVS debug tool pin
discrepances are found between VCO schematic and layout and
Ind1(generated by PCD) schematic and layout.
- used a avCompareRule command indDevice to turn Generic device
into inductor IND - still pin mismatch LVS error.
Any ideas how to solve the problem? Thanks in advance!
You are right Quek.
But the error is caused by the architecture of the differential VCO. Namely the differential output is labeled with pins, that in turn is connected to the spiral. The spiral (there is actually a couple of spirals) is treated by Assura as a typical connection, a short. I will get familiar with the suggested section of the VPCD User Guide. I've just only had a brief look on it, it looks like it addresses the issue, but might be challenging. Modifying PDK scripts - I have never done it, but I will give it a try.
Thanks both of you,
Take care, pitter.