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 Operating region 

Last post Thu, Jan 21 2010 4:30 PM by Dennis Faber. 4 replies.
Started by jugemu1234 21 Jan 2010 11:39 AM. Topic has 4 replies and 5301 views
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  • Thu, Jan 21 2010 11:39 AM

    Operating region Reply

    Hi there,

     Ive been a bit wondering about calculator function of "operation region". Is is calculated simply by Vgs, Vth, Vds? Or Is there any other thing done for this background?

     Thanks,

    • Post Points: 20
  • Thu, Jan 21 2010 2:13 PM

    Re: Operating region Reply

    What calculator function? There's not a calculator function called "operator region".

    Perhaps you're asking about how operating point parameter "region" (see "spectre -h bsim4", say) is computed? If so, it's sort of described in the Virtuoso Simulator Components and Device Models Reference manual <MMSIMinstDir>/doc/spectremod/spectremod.pdf

    Regards,

    Andrew.

    • Post Points: 20
  • Thu, Jan 21 2010 2:40 PM

    Re: Operating region Reply

    2 region=triode Estimated operating region. Spectre outputs number (0-4) in a
    rawfile.
    Possible values are off, triode, sat, subth, or breakdown.

     Thats what they say in spectremod.pdf but it does not mean how each region was defined. So my question is, say, when Vgs>Vth and Vds>Vdsat, then "region" would be simply saturation? Or Is there more complicated computation?

     Thanks,

    • Post Points: 20
  • Thu, Jan 21 2010 2:51 PM

    Re: Operating region Reply

    Try these two solutions, one for bjt and one for bsim3v3 (I think it would have the same meaning for bsim4).

    Andrew.

    • Post Points: 20
  • Thu, Jan 21 2010 4:30 PM

    • Dennis Faber
    • Not Ranked
    • Joined on Thu, Jan 21 2010
    • Duisburg, Nrth Rhine Westfalia
    • Posts 8
    • Points 160
    Re: Operating region Reply

    You can map the 5 regions as follow:

    0 cut-off

    1 triode

    2 sat

    3 subth and 4 breakdown:

    Condition for saturation region in zeroth approximation is:

    |Vds|>=|Vgs-Vth|=|Vds,sat|

    • Post Points: 5
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Started by jugemu1234 at 21 Jan 2010 11:39 AM. Topic has 4 replies.