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One testbench for different analysis (dc, trans,...)

marten

Hi there,


how can I run different analysis (dc, tran, ac,...) on a single standard cell without changing the testbench. For now I have to create a testbench for each analysis, because for dc analysis the input is comming from a vdc source and for transient analysis a vpulse is used. Is there a way to use variables for input stimuli?
Or should I use Cadence ELC ?


Cheers,
  Marten

Parents

  • Marten,

    In this case it's easy - use a vsource (could use a vpulse too, but vsource is more flexible), and specify a DC value as well as Voltage1 and Voltage2 (for vpulse) or Zero value/One value (for vsource). Then for the DC analysis, it will use the DC voltage, and for the transient analysis it will use the two voltages and ignore the DC value. Since there is no time axis in the DC analyses, the time variation will have no effect.

    You can also use sp1tswitch/sp2tswitch etc to have switches in different positions for different analyses. Be careful though because you need to ensure that the DC operating point is consistent with the tran analysis if you do this (so I'd probably avoid it).

    Or you can use the same testbench with variables on the source parameters and then use different tests in ADE XL to point at the same testbench with different variable values.

    Certainly no need to use ELC for this, in my opinion.

    Regards,

    Andrew.

Reply

  • Marten,

    In this case it's easy - use a vsource (could use a vpulse too, but vsource is more flexible), and specify a DC value as well as Voltage1 and Voltage2 (for vpulse) or Zero value/One value (for vsource). Then for the DC analysis, it will use the DC voltage, and for the transient analysis it will use the two voltages and ignore the DC value. Since there is no time axis in the DC analyses, the time variation will have no effect.

    You can also use sp1tswitch/sp2tswitch etc to have switches in different positions for different analyses. Be careful though because you need to ensure that the DC operating point is consistent with the tran analysis if you do this (so I'd probably avoid it).

    Or you can use the same testbench with variables on the source parameters and then use different tests in ADE XL to point at the same testbench with different variable values.

    Certainly no need to use ELC for this, in my opinion.

    Regards,

    Andrew.

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