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PSS analysis for 0.13um CMOS LNA design suddenly stop at 10 percent

encik RFIC

Hye, i am currently working on a design of LNA in 0.13um CMOS. Im done with s parameter and NF part and now Im trying to obtain a result from pss analysis for 1db compression Point and and IIP3. The bandwidth of this LNa is starting from 3G to10G hz. When Im doing the PSS analysis, its suddenly stop at 10 percent of iteration, meaning to say if we give the prf variable staring from -40 dBm to 0 dBm it only run until -36 dBm and the condition on ADE is turn to ready.

Please kindly help me. have try so many thing but nothing seems to work. really needs help here.
together with this thread im attached the screeshot of the output log,properties of input port, and pss analysis setting.

Parents

  • First of all, please post the entire spectre.out file as an attachment (using the Upload Media button - you might have to change the file suffix) so we can see precisely how it fails. That will also give more information about the version of the simulator you're using (clearly you're running IC5141 ADE, but I'm more concerned about the spectre version). It will also give useful info about the size of the circuit too, simulator accuracy settings and so on - you've cropped so much out that it's almost impossible to tell what you've done.

    Your setup is a bit odd too. The PSS form says that the frf fundamental is 4.5G yet you've set the PSS fundamental to 450MHz. Why? There's no point in including a subharmonic unless there's a divider somewhere (which seems unlikely). So leave the fundamental at 4.5GHz.

    Regards,

    Andrew

Reply

  • First of all, please post the entire spectre.out file as an attachment (using the Upload Media button - you might have to change the file suffix) so we can see precisely how it fails. That will also give more information about the version of the simulator you're using (clearly you're running IC5141 ADE, but I'm more concerned about the spectre version). It will also give useful info about the size of the circuit too, simulator accuracy settings and so on - you've cropped so much out that it's almost impossible to tell what you've done.

    Your setup is a bit odd too. The PSS form says that the frf fundamental is 4.5G yet you've set the PSS fundamental to 450MHz. Why? There's no point in including a subharmonic unless there's a divider somewhere (which seems unlikely). So leave the fundamental at 4.5GHz.

    Regards,

    Andrew

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