How do I calculate the maximum source to bulk voltage for a certain CMOS technology?

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Lucas Compassi Severo

For low voltage circuits the foward bulk bias is used to reduce the VT by the CMOS body effect.

In genenal it is used only for ultra-low voltage operation. For example, if vdd is 0.5V a bulk to source voltage from 0 to 0.5V is safe for latchup because it occurs only from 0.7V. The maximum bulk to source voltage can be defined also by the current leakage of the forward biased bulk-source junction.

Ahmed ayman Eid

thank you very much . your answer is very clear.

but in reverse bias bulk-source junction. is there alimitation ov vsb ?