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sizing for treshold voltage

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anantha_09

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How do you size NMOS and PMOS transistors to increase the threshold voltage?
 

mujju433

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This is an indirect question of body effect so go to www.vlsibank.com there u will find the correct answer

Bye take care
 

kishram4u

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dude......itz does depend on sizes .

the threshold voltage changes with the ratio Wp/Wn.The reason for this is that the more mobile electrons in the
NMOSFET enable the NMOSFET to operate at a lower VDS than the PMOSFET for the same
IDS, hence pulling VOUT (= VIN at threshold) low. The threshold voltage can be increased by
increasing the width of the PMOSFET (hence Wp/Wn) so that the VDS of the PMOSFET falls.
In fact, if the ratio Wp/Wn = μn/μp = 2.7, then a threshold voltage of VDD/2 is achieved
 

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