problem with sweeping the W/L ratio

[whlinfei]

w/l ratio

Hi all,

I am simulating some inverter output stage using ibm 130nm pdk.
when I want to sweep the w/L ratio and what I did was to put the variable "parameter" in the number of fingers box in the editting instance panel.
It seems incorrect.

Can anyone tell me what should be the correct way to do the sweeping ?

thank you.

Regards,
Whlinfei

 

[oermens]

w/l ratio

There is no parameter in the model called "w/L ratio". You have to make W and L variables and number of fingers is not a relevant parameter for what you want to achieve. If you want L fixed and W to vary, make length a variable (call it x for example) then make width a varible called k*x, where k is the desired W/L ratio. Then do parametric analysis, sweeping k through the desired range.