faustoleali1974
Newbie level 6
Dear sirs, i have a new question, this time regarding differential amplifier. If you look to attached image you will se the differential amplifier.
**broken link removed**
The exercise asks to calculate the differential gain Ad and the common mode gain Ac at small signal that will be used to obtain the output Vo1 with these input V1 = 5*sin(t) and V2=4*sin(t).
In the solution of the exercise they say that
Ad = - gm * Rc
Ac ≈ - (gm * Rc) / ( 1+2*gm*Re )
How did they manage to calculate the differential gain Ad and the common mode gain Ac?
Image attached
**broken link removed**
LINK
**broken link removed**
The exercise asks to calculate the differential gain Ad and the common mode gain Ac at small signal that will be used to obtain the output Vo1 with these input V1 = 5*sin(t) and V2=4*sin(t).
In the solution of the exercise they say that
Ad = - gm * Rc
Ac ≈ - (gm * Rc) / ( 1+2*gm*Re )
How did they manage to calculate the differential gain Ad and the common mode gain Ac?
Image attached
**broken link removed**
LINK
Last edited: