[Moved] Resistance Calculation from TSMC DRM

[sam_vlsi]

Can anyone help in calculating the total resistance of a net from DRM 90 nm? I know the formula :

R=Rsh*L/W

i have added all the via resistances also associated with it. But still my total resistance is little less from the actual total resistance (i got this total resistance from spice netlist after extarction, i just want to cross check whether resistance from both layout and after extraction is same or not).

Please tell what else should i take care of while calculating the resistance.

 

[Abhi Sharma]

Can anyone help in calculating the total resistance of a net from DRM 90 nm? I know the formula :

R=Rsh*L/W

i have added all the via resistances also associated with it. But still my total resistance is little less from the actual total resistance (i got this total resistance from spice netlist after extarction, i just want to cross check whether resistance from both layout and after extraction is same or not).

Please tell what else should i take care of while calculating the resistance.

Open DRM find sheet resistance Rsh, then multiply by length L, divide by width w. If u r doing the same, check for default temp coded in extraction, and Rsh temp given in DRM is same or not.