Saving the device information

 Hi,

have you tried to add

save M0:all

With Regards,

 By the way, you can use the OPT command inside the calculator to save operating points during a transient analysis

(From the help manual: OPT: Returns the transient operating point for the specified instance parameter.)

Hey mate,

save M0:all is not working.

The log file says:

Warning from spectre during initial setup.
    WARNING: subcktInst:all is not supported.
    WARNING (SPECTRE-8287): Ignoring invalid item `M0:all' in save statement.

Regards,

KK

Maybe your transistor is modeled inside a subcircuit. If it is, then you have include your subcircuit name in the expression. That is:

save M0.subCktName:all

If your subCircuit is named XXX, then the expression would be (saving cdb)

 M0.XXX:cdb 

 Maybe this is also the reason why you could not access the operating points via M0.oppoint

Mate,

I had already checked about the subckt. My transistor is not modeled inside any subckt.

--KK

 If i want to save op from a transitor i include this file ( example.scs ) via Setup->Model Libraries. I'm not sure if you include the file this way, but you could give it a try.

This is a post regarding the same topic:

 This is a very commonly asked question.

Create a text file (called, say, saveop.scs) with the following contents:

// include file to save op point data
save M0:all

where M0 is the name of the mosfet. See "spectre -h save" for more details on the save statement.

Then, in Setup->Model Libraries, reference this file (I gave it a .scs suffix so it is interpreted in spectre syntax)

 

 Check if its supported with your version

KK,

The error message you posted makes it very clear that you DO have your model defined as a subckt. For example, if I run this:

 //

model nch bsim4 type=n

subckt nmos (D G S B)
parameters w=1u l=1u
M1 (D G S B) nch w=w l=l
ends nmos

M1 (d g 0 0) nmos w=2u l=0.5u
M2 (d g 0 0) nch w=3u l=0.5u

dc dc

save M1:oppoint
save M1:all
save M2:oppoint
save M2:all

Then I get:

    WARNING (SPECTRE-8061): `M1': Does not have a terminal named `oppoint'.
    WARNING (SPECTRE-8287): Ignoring invalid item `M1:oppoint' in save
        statement.
    WARNING: subcktInst:all is not supported.
    WARNING (SPECTRE-8287): Ignoring invalid item `M1:all' in save statement.

 Which is what you saw. The M2 device doesn't complain because it's a direct instance.

Note that saving operating point data via the save statement has been supported forever as far as I know - so should not be version-specific.

Regards,

Andrew.

Andrew,

Whatever you told is right.

My transistors have a subckt by the name m1.

Mate,

Thanks for pointing the same earlier. I had not noticed in depth.

Thanks,

KK