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 spectre warnings 

Last post Mon, Feb 25 2013 6:41 AM by Andrew Beckett. 1 replies.
Started by siva123 25 Feb 2013 02:11 AM. Topic has 1 replies and 449 views
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  • Mon, Feb 25 2013 2:11 AM

    • siva123
    • Not Ranked
    • Joined on Thu, Feb 21 2013
    • Posts 5
    • Points 185
    spectre warnings Reply

    Hi sir,

    I want to do the dc analysis of current mirror in spectre simulator.

    Apply the following values

    vdc=1.2

    idc=1ma

    vdc connected to Out of current mirror and idc connected to In (ref current) of current mirror

    these warings occur give me any modifications required ?

    Warning from spectre at Ibias = 24e-03 during DC analysis `dc'

    WARNING (CMI-2682): I0.M1: The bulk-drain junction forward bias voltage (963.739 mV) exceeds `VjdmFwd' = 927.529 mV. The results are now incorrect because the junction current model has been linearized

    Warning from spectre at Ibias = 48e-03 during DC analysis `dc'.

    WARNING (CMI-2682): I0.M1: The bulk-drain junction forward bias voltage (1.02581 V) exceeds `VjdmFwd' = 927.529 mV. The results are now incorrect because the junction current model has been linearized

    dc: Ibias = 48e-03 (4 %), step = 24e-03 (2 %)

    Warning from spectre at Ibias = 72e-03 during DC analysis `dc'.

    WARNING (CMI-2682): I0.M1: The bulk-drain junction forward bias voltage (1.08486 V) exceeds `VjdmFwd' = 927.529 mV. The results are now incorrect because the junction current model has been linearized

    Warning from spectre at Ibias = 96e-03 during DC analysis `dc'.

    WARNING (CMI-2682): I0.M1: The bulk-drain junction forward bias voltage (1.10099 V) exceeds `VjdmFwd' = 927.529 mV. The results are now incorrect because the junction current model has been linearized

    dc: Ibias = 96e-03 (8 %), step = 24e-03 (2 %)

    Warning from spectre at Ibias = 120e-03 during DC analysis `dc'.

    WARNING (CMI-2682): I0.M1: The bulk-drain junction forward bias voltage (1.10537 V) exceeds `VjdmFwd' = 927.529 mV. The results are now incorrect because the junction current model has been linearized

    Further occurrences of this warning will be suppressed.

    Thanks,

    venkata siva

    • Post Points: 20
  • Mon, Feb 25 2013 6:41 AM

    Re: spectre warnings Reply

    Who knows? It suggests that you have a junction that is forward biased which you probably don't want...

    Without knowledge of the design, it's very difficult to advise (as I said in your other post).

    Andrew.

    • Post Points: 5
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Started by siva123 at 25 Feb 2013 02:11 AM. Topic has 1 replies.