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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 4288 views
• #### Thu, Jan 21 2010 11:39 AM

Operating region
 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
 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 /doc/spectremod/spectremod.pdf Regards,Andrew.
• Post Points: 20
• #### Thu, Jan 21 2010 2:40 PM

Re: Operating region
 2 region=triode Estimated operating region. Spectre outputs number (0-4) in arawfile.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
 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
• Joined on Thu, Jan 21 2010
• Duisburg, Nrth Rhine Westfalia
• Posts 8
• Points 160
Re: Operating region
 You can map the 5 regions as follow:0 cut-off1 triode2 sat3 subth and 4 breakdown:Condition for saturation region in zeroth approximation is:|Vds|>=|Vgs-Vth|=|Vds,sat|
• Post Points: 5