[SI-LIST] Re: why "error: not increasing in time" in hspice?

Hi,


The timing in your PWL expression does not seem to increase regularly. There
might be some inconsistencies in the definitions of your parameters
"inramp_l"  and "inramp_r".

If you change the expressions to inramp_l='(mid-inramp)/2*1.25' and
inramp_r='(mid+inramp)/2*1.25', the simulation will run fine. You may also
want correct your syntaxes. I modified your netlist as shown below, and I
was able to run it without error.

*options autostop accurat runlvl

*ic v(dh)=vdd

.param vdd=3

........

.param ckramp_l='9n-ckramp/2*1.25'

.param ckramp_r='9n+ckramp/2*1.25'

.param inramp_l='(mid-inramp)/2*1.25'

.param inramp_r='(mid+inramp)/2*1.25'

.......



vsel sel 0 pwl (0p vdd 'ckramp_l' vdd 'ckramp_r' 0 13n 0)

vdh dh 0 pwl (0p vdd 'inramp_l' vdd 'inramp_r' 0 13n 0)



.tran 1p 18n UIC sweep DATA=INPUT_RAMP

.DATA INPUT_RAMP inramp ckramp  mid

                        0.015n  0.015n  13n

                        0.015n  0.015n  9n

                        0.015n  0.015n  5n

.ENDDATA



.End


Good luck,
 Felix



On 5/26/08, jideguzi <jideguzi@xxxxxxx> wrote:

> hi all
>
> I created a PWL source in my main circuit but when I run the netlist with
> hspice, it gives me error: **error** piecewise
> source        0:vdh              not increasing in time
> I have tried many ways to modified it, but failed!
> is there anybody meet the same problem like that? who can tell me where I
> am making a mistake?
>
>
> my netlist codes:
> .tran 0.001n 18n UIC sweep DATA=INPUT_RAMP
> options autostop accurat runlvl
> ic v(dh)=vdd
> ........
> param ckramp_l='9n-ckramp/2*1.25'
> param ckramp_r='9n+ckramp/2*1.25'
> param inramp_l='mid-inramp/2*1.25'
> param inramp_r='mid+inramp/2*1.25'
> .......
>
> vsel sel 0 pwl (0n vdd 'ckramp_l' vdd 'ckramp_r' 0 13n 0)
> vdh dh 0 pwl (0n vdd 'inramp_l' vdd 'inramp_r' 0 13n 0)
>
> DATA INPUT_RAMP
>        inramp  ckramp  mid
>        0.015n  0.015n  13n
>        0.015n  0.015n  9n
>        0.015n  0.015n  5n
> ENDDATA
>
>
>
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