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relations between several SDD components

Question asked by PMOREL on Nov 28, 2003
Latest reply on Mar 30, 2004 by ddshark

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Hello,

I need to use some SDD components to define a new component. It is all right with only one SDD. but now I need to use two of them, and I must introduce a relation between them like "_v1(of the 1st SDD)=_v1(of the 2nd SDD)".
Is there a way to do this ??
I have the same issue to define a variable like "XX=_v1(of the 1st SDD)+_v2(of the 2nd SDD)" when there are more than one SDD.
I didn't see anything about this in the help.

Thanks.

P.S. : is there a way to attach files (like shematics) with this kind of mail to make it easier to understand ?

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mfredrik Dec 1, 2003 1:44 AM
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"
I must introduce a relation between them like "_v1(of the 1st SDD)=_v1(of the 2nd SDD)".
Is there a way to do this ??
"

You can't place multiple SDD's on the same schematic page and write equations like this as far as I know. I think you need to put one of the two SDD's into another subcircuit.
- Place the new subcircuit with the second SDD on the schematic where you have the first SDD. You may want to add one or more extra outputs to this subcircuit so that you can access certain pins/voltages of this SDD.
- Your first SDD will have to have one or more extra pins which can read the voltage(s) from the second SDD subcircuit. E.g. if you need a 2 port SDD and need to use one voltage from the second SDD then you need to go with a 3 port SDD where the extra pin would be connected to the second SDD subcircuit to sample the voltage you need.
Many times it's easier to try to implement it into one single SDD instead so that you don't have to deal with this. Then you can access any voltage easily as you already found out.

"
P.S. : is there a way to attach files (like shematics) with this kind of mail to make it easier to understand ?

"
No, sorry. This feature was not enabled because of the risk of virus and other mean attachments to be spread using our website. We might revise that decision but for now it's not possible.
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ddshark Mar 30, 2004 4:36 AM
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Just to clarify, it is possible to include multiple SDDs on the same schematic page. But it is not possible to share, via equations, any state variable dependent information between the SDDs. If you need the same circuit voltage for multiple SDDs, then this circuit voltage must be connected to a port on the multiple SDDs. (As previously mentioned, it might be best to just have one large SDD.)

It is possible to share expressions and functions between SDDs. For example, if there is one expression Iout = exp(_v1), then Iout can be used in both SDD1 and SDD2. However, for SDD1, Iout will be evaluated using SDD1 _v1 voltage; and for SDD2, Iout will be evaluated using SDD2 _v1 voltage.
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