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how does APS handle 0-V DC sources? Is iprobe better?

vivkr

How does APS handle 0-V DC sources? When running APS sims, I observed that the currents measured through 0V DC sources were radically different from the expected currents. Interestingly, the total current drawn from the blocks or currents directly probed on transistors seem to be usually correct.

Is it necessary to use iprobe elements? What's the difference in the way the simulator handles these two elements? 

Thanks,

Vivek

 

  • Andrew Beckett
    Hi Vivek,

    I know that APS can filter out 0V sources, but if not filtered I wouldn't expect the currents to be different. Iprobes don't get filtered because the point of adding them is to allow you to measure current, whereas 0V sources could be for all sorts of reasons.

    I would suggest logging a service request via http://support.cadence.com to investigate this properly.

    Regards,

    Andrew
  • vivkr

     Thanks for the response Andrew! So are you suggesting that the simulated currents should be more or less comparable when using APS vs. Spectre?

    I will try to file a service request. 

    Regards,

    Vivek

  • Andrew Beckett
    Hi Vivek,

    That's what I would expect.

    Andrew

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