mvj
Advanced Member level 4
Dear All,
If we do the small signal analysis of
1. CS stage with source degeneration ( ie. additional resistor at the source terminal)
2. Source follower
3. Common gate stage
all the three have their source voltages varying as the input voltage varies, hence all of them would have influence of body effect. However, in the case of the first two cofigurations the small signal gain is decreased due to body effect and in the last case gain is increased.
May I know why this difference occurs when influence of body effect in all the circuits is the same i.e. to decrease the drain current.
Thanks a lot in advance!!
M.
If we do the small signal analysis of
1. CS stage with source degeneration ( ie. additional resistor at the source terminal)
2. Source follower
3. Common gate stage
all the three have their source voltages varying as the input voltage varies, hence all of them would have influence of body effect. However, in the case of the first two cofigurations the small signal gain is decreased due to body effect and in the last case gain is increased.
May I know why this difference occurs when influence of body effect in all the circuits is the same i.e. to decrease the drain current.
Thanks a lot in advance!!
M.