display Rds(M1) in Hspice

[020170]

hspice rds on

when I simulate only single MOSFET, I want to display Rds(m1) as Vgs increased.

but I can't see that

Clearly, I can display Gds(m1) and this result is surely correct.

--------------------------------------------------
...
.PRINT gdso(m1)
...
--------------------------------------------------

but next command is not working properly. But I cannot tell the reason.

--------------------------------------------------
....
.PRINT RDS=par('1/gdso(m1)')
...
--------------------------------------------------

this graph curve is so odd, not correct.

is there anyone who can tell me the reason?

thanks.

 

[ezt]

hspice rds

Hi.
Can you tell me why do you think that's not correct? and by the way have you make a DC sweep? if yes, still you think the output curve is not correct? please send your circuit and results, then I can answer better.

Regards,
EZT

 

[020170]

Mm...

maybe I get hold of the wrong end of the stick.

thanks.