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spectre - saving by specific subcircuit

swdesigner

Is it possible to tell spectre to save all nodes or terminal currents within a certain subckt? It's trivial in Hspice, you could do

 

save all Xtop.Xsub.*

 

I believe there's even a way to use the wildcards to get it to only do the top-level within that subcircuit, but I don't recall it..

 

Any ideas? How would it be done through the ADE, without messing with the netlist?

Parents

  • Hi,

      Referring to the use save-statement to save operating points for specify transistors located within a hierarchy. I had been using the include statement method (e.g., create a file and add the file via Setup->Model Libraries in Analog Design Environment window) but ran into problem with the use of wildcard.

      In my test bench, I have a circuit block that is used five times within a hierarchy and they are name IDBA. I want to save the operating condition for a transition (P18) within the circuit block and I included this statement "save DUT.ILNA.IDBA\.P18:oppoint" hoping with the intention of having spectre save the operating points for the transistos P18 in all the five copies.

      Unfortunately, the operating points for all five transistors were not saved and executing the command "OP("/IDUT.ILNA.IDBA.P18" "gm") returned nil. If I changed the save-statement to "save DUT.ILNA.IDBA\.P18:oppoint" then the OP command would return a number. Do I have to have a separate save-statement for each instance of IDBA? Or I have to use another symbol as a wild card?

      Thanks!

     

    Regards,

    Su

     

Reply

  • Hi,

      Referring to the use save-statement to save operating points for specify transistors located within a hierarchy. I had been using the include statement method (e.g., create a file and add the file via Setup->Model Libraries in Analog Design Environment window) but ran into problem with the use of wildcard.

      In my test bench, I have a circuit block that is used five times within a hierarchy and they are name IDBA. I want to save the operating condition for a transition (P18) within the circuit block and I included this statement "save DUT.ILNA.IDBA\.P18:oppoint" hoping with the intention of having spectre save the operating points for the transistos P18 in all the five copies.

      Unfortunately, the operating points for all five transistors were not saved and executing the command "OP("/IDUT.ILNA.IDBA.P18" "gm") returned nil. If I changed the save-statement to "save DUT.ILNA.IDBA\.P18:oppoint" then the OP command would return a number. Do I have to have a separate save-statement for each instance of IDBA? Or I have to use another symbol as a wild card?

      Thanks!

     

    Regards,

    Su

     

Children
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