effective channel length in hspice

[lili94]

Hi,
I have a basic question. I want to simulate a 14 stages ring oscillator under all possible values of effective channel length (from 35nm to 55nm) and temperature(from 20 C to 150 C) via Hspice, with the 45nm high-performance predictive technology model. But I don't know how simulate with different effective channel length and temperature! Please help me. This is the what I write with 90nm, but it doesn't work:

*CMOS Ring Oscillator

.op
.include 'e:\PTM90.txt'

V1 vdd 0 5V
V2 vss 0 0V

.PARAM Le=90nm
.PARAM Wi=180nm


.subckt inv Vout Vin Vdd Vss
* D G S SS Model W L *
M1 Vout Vin Vdd Vdd PMOS W=Le L=2Wi
M2 Vout Vin Vss Vss NMOS W=Le L=2Wi
CL1 Vout Vss .1pF
.ends INV

*14 stage ring
x1 2 1 vdd vss inv
x2 3 2 vdd vss inv
x3 4 3 vdd vss inv
x4 5 4 vdd vss inv
x5 6 5 vdd vss inv
x6 7 6 vdd vss inv
x7 8 7 vdd vss inv
x8 9 8 vdd vss inv
x9 10 9 vdd vss inv
x10 11 10 vdd vss inv
x11 12 11 vdd vss inv
x12 13 12 vdd vss inv
x13 14 13 vdd vss inv
x14 1 14 vdd vss inv

.MODEL nch NMOS
.MODEL pch PMOS

.tran 10ps 64us
.prob
.END

 

[dick_freebird]

Can you even have a variable name like '2Wi'? And why
do Ls have Wi while Ws have Le?

Just make your Ls something like L=Lnom_N+deltaL_N,
L=Lnom_P+deltaL_P; set your Lnoms to nominal and
loop or MC your deltaL_N, deltaL_P