Problem in Multisim with transient analysis and initial conditions

[nik45]

Hello everyone,
I have a problem in multisim with transient analysis and initial conditions.
If I do transient analysis with automatically determined initial conditions the circuits works.
If I do transient analysis with user-defined initial conditions the circuits works in cases.

--Working with user-defined---
*## Multisim Component V2 ##*
vV2 3 0 pwl(0 0 0.001 0 {0.001+1e-008} 3 {0.001+1e-008+1} 3)

*## Multisim Component R1 ##*
rR1 3 0 10000 vresR1
.model vresR1 r( )
---------------------------------------------

--Working with user-defined----------
*## Multisim Component V2 ##*
vV2 1 0 pwl(0 0 0.001 0 {0.001+1e-008} 3 {0.001+1e-008+1} 3)

*## Multisim Component U1 ##*
xU1 1 0 MEMRISTOR__MEMS__1__1
-------------------------------------------------------------


--Not Working with user-defined-------
*## Multisim Component V2 ##*
vV2 3 0 pwl(0 0 0.001 0 {0.001+1e-008} 3 {0.001+1e-008+1} -3)

*## Multisim Component R1 ##*
rR1 3 1 10000 vresR1
.model vresR1 r( )

*## Multisim Component U1 ##*
xU1 1 0 MEMRISTOR__MEMS__1__1
---------------


The costum component includes something like that:
.subckt MEMRISTOR__MEMS__1__1 plus minus PARAMS:
*Parameters values
+rmin=100 rmax=390 rinit=390 alpha=1E3 beta=0 gamma=0.1 VtR=1.5 VtL=-1.5 yo=0.0001
+m=82 fo=310 Lo=5

blah blah ...

.ends Memristor

Namely, if I combine the resistor and my custom component in one circuit, transient analysis with user defined initial conditions gives an error (timestep too small).

[Tien_P]

Hi  Nik,

If possible, please post the Multisim file. This way, I can get access to all your settings.