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spectre warnings

siva123

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

Parents
  • Andrew Beckett

    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.

Reply
  • Andrew Beckett

    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.

Children
  • monglebest
    in reply to Andrew Beckett

    I see similar warnings as well. I checked such warning in my circuit, it's related with power up sequence and it's really design dependent.

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