5Spice Question on GMIN

[Jim Miller]

I'm a Spice newbie. I found a Spice implementation called 5Spice which has a
limited version that I'm using to model an integrator. The National LMC6061
requires that an option setting be made to properly model the input.

..OPTIONS GMIN=1E-16

I haven't found a place to input this info.

Anyone have any ideas?

thanks

jtm

 

[Kevin Aylward]

Jim Miller wrote:

I'm a Spice newbie. I found a Spice implementation called 5Spice
which has a limited version that I'm using to model an integrator.
The National LMC6061 requires that an option setting be made to
properly model the input.

.OPTIONS GMIN=1E-16

This is for convergence issues, not modelling issues as such. It may not
be required, depending on the spice engine.

I haven't found a place to input this info.

Anyone have any ideas?

Play with the help. Look for something that says "options"

Or, alternatively, have a go with SuperSpice, options such as this are
set-up in the GUI. Note that the demo allows for 30 top level block
schematics components and 25 per schematic block in a hierarchy allowing
for 30*25=750 real components.

Kevin Aylward
salesEXTRACT@anasoft.co.uk
http://www.anasoft.co.uk
SuperSpice, a very affordable Mixed-Mode
Windows Simulator with Schematic Capture,
Waveform Display, FFT's and Filter Design.

 

[Jim Miller]

hi jim

i found that but it is a drop down dialog and only goes as far as 1e-12
which is what i've set it to rather than the default of 1e-11.

the developer responded and indicated that 1e-12 is a limitation of the
program for some reason.

no biggie...

tnx
jtm