$ sign in extracted hspice netlist

[Milad-D]

In the netlist which is extracted by calibre pex, for each component, I get $x $y $d. I think that they are Jus the indication of the location of component in the layout. Therefore if I delete them from the netlist, I will not see any difference In the simulation.

I found that it is true for mos transistor,BUT for MIM capacitor, that was not the case. In fact, without deleting these location parameters for MIM capacitor, I got the weird results.

Can anybody tell me more about these location parameters which are indicated by $ sign in the netlist.

 

[sdedov]

In theory, any information after the $ sign till the end of the line in the spice netlist is considered as comment.
Anyway as I remembler you can suppress the location information output to the netlist during the Calibre PEX run.

 

[Milad-D]

The extracted code for the MIM capacitor was like:
XC1 node1 node2 gnd $x=... $y=... $d=... l=... w=...

I have found that if I delete the coordinates, I get the right post-layout simulation. Without this modification I got very weired simulation results. Interestingly, I have found that if I shift the coordinates to the end of the line, also problem will be solved.

 

[sdedov]

You can aviod the coordinates output in PEX (Calibre interactive using PEX Options-> Netlist->uncheck Output intentional device location).