How to find the output swing of fully differential amp????

[wael_wael]

hi every body,

i have fully OP AMP, 1.8v(single source), with fully differential input 1v(ac) and vcm/2=0.9
how the output curve will be. it should equal zero at 0.9 vollt or at zero
best regards

 

[waxtomato]

of course, the max possible swing is 1.8*2, but you need upload the circuit image , we can figure out the exact swing