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Working with DC sweeps and OP

MicheleA

Hi all,

I know it's not appealing to write one's first post in an RF focused group talking about DC but please bare with me :)

I am interested in plotting some MOS DC parameters like gm, gmoverid, Cgg, gds as they vary across VGS and VDS.

Keeping VDS fixed for the moment, I would expect to be able to DC sweep VGS and get a curve of - say - gm Vs. VGS. This is not the case. I actually get only one point, which is the point corresponding to the "static" value of VGS, in the design variables list.

Of course I could set up an equation in the Calculator for the derivative of Id but I think that "somewhere" the tool should calculate those parameters for me...And also because for some trickier parameters like Cgg the whole process would be more complicated.

The alternative to that is to run a parametric analysis, but this is way less effective timewise.

 Does anybody know of a way of overcoming this?

Thank you in advance,

 Michele

Parents

  • Michele,

    There are two parts to the Matlab interfaces. There's one which is an interface to Simulink - available with spectre and AMS Designer - which allow co-simulation with Simulink; and a toolbox to allow Matlab to read spectre/Ultrasim/AMS simulation results directly into Matlab for further processing. 

    It is possible to do system simulations in the Cadence IC tools, but I wouldn't say that there is a particularly rich library compared with other more dedicated system simulation tools such as Simulink. That's one of the reasons for offering a co-simulation capability with Simulink. There are a fair number of blocks for certain types of systems - primarily for RF systems - so the Spectre RF documentation (User Guide and Theory) in the MMSIM documentation are a good place to look. You can also do system simulation using AMS Designer - provided that you have Verilog/Verilog AMS/VHDL/VHDL AMS/SystemVerilog models to do so (there are some libraries included in the software).

    I'd say your best bet is to contact Cadence (either via customer support, or via your account manager) so we can discuss in more detail your requirements.

    Best Regards,

    Andrew.

     

Reply

  • Michele,

    There are two parts to the Matlab interfaces. There's one which is an interface to Simulink - available with spectre and AMS Designer - which allow co-simulation with Simulink; and a toolbox to allow Matlab to read spectre/Ultrasim/AMS simulation results directly into Matlab for further processing. 

    It is possible to do system simulations in the Cadence IC tools, but I wouldn't say that there is a particularly rich library compared with other more dedicated system simulation tools such as Simulink. That's one of the reasons for offering a co-simulation capability with Simulink. There are a fair number of blocks for certain types of systems - primarily for RF systems - so the Spectre RF documentation (User Guide and Theory) in the MMSIM documentation are a good place to look. You can also do system simulation using AMS Designer - provided that you have Verilog/Verilog AMS/VHDL/VHDL AMS/SystemVerilog models to do so (there are some libraries included in the software).

    I'd say your best bet is to contact Cadence (either via customer support, or via your account manager) so we can discuss in more detail your requirements.

    Best Regards,

    Andrew.

     

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