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how many percentage does the matching of MOS can achieve?

amwygah

In my design of differential amplier, I use two 40u/8u MOS transistor as the differential pair.
And my process is 0.35um BCD.

Then ,can I know how many percentage does the matching of input MOS transistor can achieve?

Can it be simply caculate as:0.05u/8u=0.625%?

where 8u is the length of MOS（I guess）; 0.05u is the accuracy of 0.35um BCD process.

  • You should run a montecarlo/DC_match sims if your process has mismatch and statistical parameters modeled. Then you can find the standard deviation and other mismatch parameters.

  • Thanks for your reply. But my model library cann't support the monte carlo analysis and dc match analysis.

    And in such condition, I want to know the maxmum mismatch in the transistors.

    Can I evaluate the  mismatch like what i have posted in the topic ?

  • I believe you cannot. The mismatch decrease inversely with sqrt(area) i.e sqrt(W*L). In your model, you don't even consider width. You have to get the actual mismatch numbers from a statistical test of the actual devices or from CAD models if such a test had been done and modeled. This numbers depend on fab/process and various others like W,L, fingers,layout,overdrive etc.

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