I have this code for hspice simulation
q3 simulation
vs vin 0 ac 1 0
r1 vin va 2k
r2 va vb 2k
r3 vb 0 4k
r4 vb vout 8k
e1 vout 0 0 va 2e5
.AC DEC 50 100 100k
.end
but it resulted in this error
**warning** no ac outputs specified, analysis omitted
How can I fix it?