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  1. #1
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    Different methods of Vbe measurement for BJT: which one is more accurate?

    Hi guys,

    I'm designing a thermo diode and want to measure Vbe value to get the non-ideality factor.
    I have two ways to get Vbe in .meas statement.
    First method is:
    .meas tran VB find V(B) at 40n
    .meas tran VE find V(E) at 40n
    .meas VBE param = 'VB-VE'

    Second method is
    .meas tran VBE vbe(xtd1.xqq0.qin)

    Both methods produce different values. Let say first method I get 0.6637V and second method I get 0.6552V. Which value is more accurate? And why they have different values?
    Please advise.

    Thanks.

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  2. #2
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    Re: Different methods of Vbe measurement for BJT: which one is more accurate?

    This might not offer an explanation but a possible solution:

    Take the average of the two values you get. Use the answer.

    Humza.
    I'm here to learn and possibly help.



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  3. #3
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    Re: Different methods of Vbe measurement for BJT: which one is more accurate?

    Could it be first method includes parasitics and second method is based on spice model?



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