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cds_generic nmos extracting as 4-terminal

jmoriarty

Using IC6.1.5-64b.500.9.  

Instantiating "nmos" (not "nmos4") symbol view from "cds_generic" library in which the model field is populated with "mod".  It extracts as  follows:

M6 (0 0 0 0) mod

The symbol view has only 3 terminals, and there are only 3 terminals in the pin list. There appears to be an error in the "spectre" view, which shows 4 terminals.  Only fix is to copy "symbol" and "spectre" views to an editable library and delete a terminal from the "spectre" view.  If this is indeed an error, can it be corrected in the next release?  If there is already an open ticket I appologize for not finding it.

 Thanks.

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  • jmoriarty

    Thanks very much Quek. Actually, once the cell is copied, it's just as easy to delete the two pins from the spectre view, though I have used the netSet property before in other situations.

    The reason that a three-terminal symbol is useful is that models for discrete DMOS devices generally are three-terminal. Having a three-terminal symbol available in a standard spectre library allows the user simply to instantiate the three-terminal symbol and populate the model field with the name of the model provided by the DMOS manufacturer. (It is assumed that the models library has already been added to the user's model path.)   

     I'd like to request that a three terminal symbol be added to analogLib if possible. Cadence could call it "nmos3" to fit with the "nmos" and "nmos4" devices already there. I think it would get used, maybe more than the other two cells because most companies use their own libraries or use libraries from fab PDKs for design, either of which includes symbols compatible with bsim models.  On the other hand, it's easy to create a copy, so not really that important.

    Thanks again Quek.

    Jack

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  • jmoriarty

    Thanks very much Quek. Actually, once the cell is copied, it's just as easy to delete the two pins from the spectre view, though I have used the netSet property before in other situations.

    The reason that a three-terminal symbol is useful is that models for discrete DMOS devices generally are three-terminal. Having a three-terminal symbol available in a standard spectre library allows the user simply to instantiate the three-terminal symbol and populate the model field with the name of the model provided by the DMOS manufacturer. (It is assumed that the models library has already been added to the user's model path.)   

     I'd like to request that a three terminal symbol be added to analogLib if possible. Cadence could call it "nmos3" to fit with the "nmos" and "nmos4" devices already there. I think it would get used, maybe more than the other two cells because most companies use their own libraries or use libraries from fab PDKs for design, either of which includes symbols compatible with bsim models.  On the other hand, it's easy to create a copy, so not really that important.

    Thanks again Quek.

    Jack

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