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such as when we calculate the vdsat,Vth should be larger than Vth(source) due to the body effect,namely Vdsat<Vgs-Vth(Source),why neglect the variation?The body effect changes the Vgs threshold so it effects that voltage for whichever terminal is used as the source. What type of effect do you think it could have on the drain?
Sorry I don't understand what effect you are talking about. :???:such as when we calculate the vdsat,Vth should be larger than Vth(source) due to the body effect,namely Vdsat<Vgs-Vth(Source),why neglect the variation?
In the layout,the source and the drain are indentical,why we don't consider the body effect caused by Vdb>0?