I'm trying to do an AC sweep of the following circuit: enter image description here

But I'm getting the following error:

*Analysis directives: 
.AC DEC 5 0 1000000
ERROR(ORPSIM-16103): Invalid value
.PROBE64 V(alias(*)) I(alias(*)) W(alias(*)) D(alias(*)) NOISE(alias(*)) 
.INC "..\SCHEMATIC1.net" 

 * source ECE209LEC
 C_C4         N00807 N00815  0.11u  TC=0,0 
 R_R4         N00807 N00963  1000 TC=0,0 
 C_C2         0 N00889  40n  TC=0,0 
 R_R2         N00791 N00889  1k TC=0,0 
 C_C1         N00791 N00799  0.26u  TC=0,0 
 V_V1         N00873 0  
 +SIN 0 10 1000 0 0 0
 R_R1         N00873 N00791  1k TC=0,0 
 C_C3         0 N00963  90n  TC=0,0 
 E_U1         N01832 0 VALUE {LIMIT(V(N00889,N00799)*1E6,-15V,+15V)}
 E_U2         N01817 0 VALUE {LIMIT(V(N00963,N00815)*1E6,-15V,+15V)}
 R_R3         N01832 N00807  1000 TC=0,0 
 ** Floating/unmodeled pin fixups **
 R__UC0001   N01817  0   {1/GMIN}

 **** RESUMING freq.cir ****

For the start frequency I chose 0 and the end frequency 1000000.

What can I do to fix it?

  • 3
    \$\begingroup\$ You can't start an AC simulation at 0Hz since this would be DC. \$\endgroup\$ – Mario Nov 3 '16 at 20:47
  • \$\begingroup\$ As Mario says, it doesn't make sense to put 0Hz. In fact, you can have an infinite amount of decade between 0Hz and 1MHz (0.000001, 0.00001, etc.). \$\endgroup\$ – lucas92 Nov 3 '16 at 20:48
  • \$\begingroup\$ @lucas92 Thank you! I was finally able to fix it thanks to you, guys. \$\endgroup\$ – Jack Nov 3 '16 at 21:38
  • \$\begingroup\$ Why doesn't DC make sense if it's a linear sweep? \$\endgroup\$ – endolith Feb 7 '17 at 22:29

Your start point for an AC sweep cannot be 0. It must be a greater value than 0, otherwise it would be DC.


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