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problem simulating op-amp from spice .cir using ADS

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spice cir

hi all,
i convert an op-amp spice model (.cir) into an ADS library.
the op-amp is AD8000 from analog device, i download its spice model (.cir) and then import it into ADS .dsn and use hierarchy.

the problem:
in its original spice model there is "IF" statement like this:
EBCRTL 8 0 Value = {IF(V(PLUS)-V(MINUS) > V(REF) , 1 , 0)}
in ADS it it imported to something like:
(ADS_SPC_IF(_v2-_v3>_v4,1,0))-_v1

when i run the simulation, hpeesofsim says errors:
Unresolved references: X1.ADS_SPC_IF

is there among you experienced this issue?

regards,
sigit
 

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