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mos varactor becomes unstable..

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gggould

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mos varactor

Hi all,

Today I read a sentence in the IBM design menu. It says for the mos varactor device, when the Vg-d is below -0.5V (eg. vg=0.1V, Vsub=0V, Vd/s=0.7V), the capacitance could become unstable.

That is scary. I have never seen this in other foundry's design menu (tsmc/umc/jazz).

Does anyone know if this acturally applies to the MOS varactor from other foundry too??

Thanks
 

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