My oscillator not oscillate in hspice [hlp]

[april1975]

Hello
I have written an sp file and tried to simulate it with Hspice. But it doesn't oscillate!
The code is:

.option post=2
.tran 0.0001n 20u
.param lg=0.18u
*.ic v(x)=0

VDD vdd 0 DC 1.8

m1 x y 0 0 NMOS L='1*lg' W='10*lg'
m2 y x 0 0 NMOS L='1*lg' W='10*lg'


L1 vdd x 5n
C1 vdd x 5p
Rp1 vdd x 220

L2 vdd y 5n
C2 vdd y 5p
Rp2 vdd y 220

istart x y pulse (0 10nA 1ns 1ns 1ns 2ns 2s)

*.op

.end

I have used a 0.18u technology file for it and included it in the code.
What's the problem?

 

[pancho_hideboo]

Before transient analysis, confirm small signal loop gain by ".AC" or ".LSTB" analyses.

**broken link removed**

https://sanjayavasarala.wordpress.c...in-hspicematlab-using-middlebrooks-technique/

 

[april1975]

Hello Pancho
You wrote:

Before transient analysis, confirm small signal loop gain by ".AC" or ".LSTB" analyses.

Can you explain more? Can you give an example?
tnx

 

[pancho_hideboo]

Read text book on basic electronic curcuit.