sizing for treshold voltage

[anantha_09]

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

 

[mujju433]

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

Bye take care

 

[heyheyhey]

You don't change w/l, you change Vb. https://en.wikipedia.org/wiki/Body_effect

 

[kishram4u]

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