how to control the time step in .Tran analysis in spice3?

use the 'linearize' command:

Also, note the comments about not setting Tmax in

Charles.

That will certainly work, although if the samples are intended for use with an FFT, the linear interpolation will introduce enough error that the noise floor will be rather high -- like -90db from the signal, at best...

--Steve

Thanks for your reply. I tried the command "linearize", it does work when I type the command in spice3 invironment. However, when I put the all the commands into one spice file, it does not work. I was using :

.tran .. .. .linearize V(1) .print tran V(1)

The result is still as there is no ".linearize" command. How can I solve this problem? Thanks!

cici

Linearize is a spice3 interactive command. There is no dot-command equivalent so you need to replace the above lines by:

..tran .. .. ..control run linearize v(1) print tran.v(1) ..endc

Charles