Spice simulation problem (option pivot)
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Posted by on November 25, 2006, 8:56 am
Please log in for more thread options Hello, I'm simulating a Sigma-Delta modulator in Hspice and I get the following error: *error*: maximum conductance on node 0:ecompar =( 0.0000D+00) is less than pivtol. check hookup for this node. set option nopiv and rerun. I set .option NOPIV and rerun, but still get the same message. I am using voltage controlled sources as opamps : *************************** Rin in integr_n 1k $interg_n =>negative input of
intergrator's opamp
Eintegr compar_n 0 OPAMP GND integr_n $compar_n =>negative input of
comparator's opamp
Cint integr_n compar_n 30p Rintegr integr_n fdb 1k $fdb =>feeback from the latch
Ecompar latch_in 0 OPAMP GND compar_n MAX=5 MIN=0
*************************** the rest of the circuit is 8 mosfets implementing a latch. Does anyone have any idea why I get this message, and why setting the option NOPIV is ignored?? Thanks George ( mail: giorgos.puiklis at gmail.com) | ||||||||||||||||
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Posted by Fred Bartoli on November 25, 2006, 9:25 am
Please log in for more thread options giorgos.puiklis@gmail.com a écrit : > Hello,
> > I'm simulating a Sigma-Delta modulator in Hspice and I get the > following error: > > *error*: maximum conductance on node 0:ecompar =( > 0.0000D+00) > is less than pivtol. check hookup for this node. set option > nopiv and rerun. > > I set .option NOPIV and rerun, but still get the same message. I am > using voltage controlled sources as opamps : > *************************** > Rin in integr_n 1k $interg_n =>negative input of > intergrator's opamp > Eintegr compar_n 0 OPAMP GND integr_n $compar_n =>negative input of > comparator's opamp > Cint integr_n compar_n 30p > Rintegr integr_n fdb 1k $fdb =>feeback from the latch > Ecompar latch_in 0 OPAMP GND compar_n MAX=5 MIN=0 > *************************** > > the rest of the circuit is 8 mosfets implementing a latch. > > Does anyone have any idea why I get this message, and why setting the > option NOPIV is ignored?? > I didn't check the rest but the option syntax is .options ... (notice the final 's'). On my spice (which isn't hspice) the misspelled .option line is simply ignored without any warning. -- Thanks, Fred. | ||||||||||||||||
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