bigworm
Member level 3
simulation - puzzle
I found a strange simulation results when I simulate my low frequency VGA.
it works at 200KHz,
and I use IC5033 to do trans. simulation with reservative precision.
the results show that it works quite well.
but when I modify the precision to 1ns(maxstep option)
the results becomes strange, and many spurs come out.
I wonder which is the right case.
and is the result under 1ns step more close to the reality or not?
it really puzzle me.
Please help
I found a strange simulation results when I simulate my low frequency VGA.
it works at 200KHz,
and I use IC5033 to do trans. simulation with reservative precision.
the results show that it works quite well.
but when I modify the precision to 1ns(maxstep option)
the results becomes strange, and many spurs come out.
I wonder which is the right case.
and is the result under 1ns step more close to the reality or not?
it really puzzle me.
Please help