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Cannot plot most terminal currents (transient)

smiff

For devices from our foundry's PDK, I cannot plot transistor terminal currents. I can plot at least one type of resistor terminal current.

To make this simpler, I cannot plot terminal currents for the analogLib ideal resistor (res).

Under Outputs->Save All, I have saved all signals, power signals and device currents. The subcircuit probe level is set to 10.

I select the terminal current in the calculator, using the tran tab, and 'it'. This puts the current in the stack:

IT("/R33/PLUS")

When I click Eval, I get this error:

Evaluation error(Unknown scalar data type: nil). Expression: IT("/REE/PLUS")

I'm using Virtuoso ADE 5.10.41.500.6.149

Any help will be greatly appreciated.

Steve

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  • in reply to smiff

    I should point out that setting subcktprobelvl (to a high number) is a very good way of significantly impacting the speed of the simulator. It causes an iprobe to be placed in series with every subckt terminal down through the hierarchy, which can massively increase the matrix size to be solved. Whilst iprobes themselves are not expensive components, have a lot of them can have a big effect. You're far better off asking to save the currents you actually need rather than saving a load of currents this way.

    Regards,

    Andrew.

  • in reply to Andrew Beckett

    Thanks for that Andrew, I'll file that in 'things to not do'. In this case, I was trying all possibilities, will reduce.

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