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Saving the device information

rkkIITB

Hi,

I am simulating a simple circuit with a MOSFET whose instance name is M0.

In the simulator input file, I have specified "save M0:oppoint" .

However, simulator gives warnings as below,

"Warning from spectre during initial setup.
    WARNING (SPECTRE-8061): `M0': Does not have a terminal named `oppoint'.
    WARNING (SPECTRE-8287): Ignoring invalid item `M0:oppoint' in save
        statement.
"

Can you please let me know how I can see the parameters of the mosfet for the entire simulation time in a transient simulation.

I am using the following version of spectre

Cadence (R) Virtuoso (R) Spectre (R) Circuit Simulator
Version 7.2.0.442.isr15 32bit

Also, can you please help me to do the same using ADE.(not manually editing the simulator input file)

Thanks in advance.

Parents
  • Andrew Beckett

    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.

Reply
  • Andrew Beckett

    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.

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