Enno
02/11/2023, 6:28 PMRoberto Di Lorenzo
02/11/2023, 8:13 PMStefan Schippers
02/11/2023, 11:23 PMmult
is the number of parallel devices.
If you use m=10000
you are simulating 10000 parallel devices but the simulation cost is just 1 mos device. The simulator multiplies all needed parameters (current, capacitances, etc) by 10000.
nf
defines the number of gate fingers. Given W=10 and L=1 you can draw this transistor on the layout in different ways. below the same transistor drawn with nf=1 and nf=2 fingers.
The first one has xschem parameters W=10 L=1 nf=1
, the second has parameters W=10 L=1 nf=2
.
In xschem W is always the total width. In the second case the actual layout has 2 gate fingers each one has width 5 so 5*2=10 is the total W.