(4) 差动放大器R2
ib- =0 uo R1 + ui1 R2 u- = R + R 1 2 ib+ =0 ui2R2 u+ = R + R 1 2 u- = u+ ui2R2 R1 + R2
ui1 ui2 R1 R1
_ + +R2
uo
uo R1 + ui1 R2 = R1 + R2
uo
R2 R1
(u i 2 u i1 )9
(4) 差动放大器R2
ib- =0 uo R1 + ui1 R2 u- = R + R 1 2 ib+ =0 ui2R2 u+ = R + R 1 2 u- = u+ ui2R2 R1 + R2
ui1 ui2 R1 R1
_ + +R2
uo
uo R1 + ui1 R2 = R1 + R2
uo
R2 R1
(u i 2 u i1 )9