例题3R10K0,R20c11,nE 求 2 u 0 ● u il R R (Ion zon)id i R =(20/10)3-(-1) 12 Ruo2=u2(1+R2/R1=3V 8V
11 例题3. R1=10k , R2=20k , ui 1=-1V， ui 2=1V 。 求:uo uo _ + + R2 R1 R1 R2 ui1 _ + + ui2 _ + + R2 R1 RP uo= (uo2- uo1) =(20/10)[3-(-1) ] =8V R2 R1 uo1= ui1=-1V uo2= ui2(1+R2 /R1 )=3V
例题3.若u- sino t v,u;2I,求: Uol=uil=sino tV u2=u2(1+R2/R1)=3V u R u =(20/10)(3- sino t) =6-2 sino t V 12
12 例题3. 若ui1=sin t V， ui 2=1V ，求:uo uo1= ui1= sin t V uo2= ui2(1+R2 /R1 )=3V uo= (uo2 - uo1) =(20/10)(3- sin t ) =6 - 2 sin t V R2 R1
(5)反相求和运算 u=0 =0,i =0 R R F F F u 12 0 2 R R 2 R F i2 o R F 0 i1 RE 12 虚地 R R P 若R1=R2=R, R 取Rp=R1∥R2/RF (ur+u12) R
13 (5) 反相求和运算： _ + + R RF 1 R2 ui2 uo RP ui1 i1 i2 iF 虚地 uo =-( ui1 R1 RF + ui2 R2 RF ) 若R1 =R2 =R, uo = - (ui1 R RF + ui2 ) 取RP= R1 // R2 //RF uo _ + + RF R1 RP ui u+ = u− = 0 i i b+ =0 b- =0, i1 + i2= iF ui1 R1 = ui2 R2 + -uo RF
(6)同相求和运算: R R R 0 R u A=1+ R R 12 取R1/R2=RP/Rr R F R R Uo =A u+=( 1 )( R R+R il Ri+ r2 R 当R1=R2时,uo (1+ )(u1+u2) R 4
14 (6) 同相求和运算： Au= RF Rf 1+ uo = Au u+ =( )( + ) RF Rf 1+ R2 R1 + R2 ui1 R1 R1 + R2 ui2 取R1 //R2=RF //Rf 当R1 = R2 时, uo = ( )(ui1 + ui2) RF Rf 1+ 1 2 Rf RF + + ui1 R1 uo R2 ui2 - u+ _ + + RF Rf RP ui uo
⑦)微分运算: 0 F R R d C C dt lo F R2 d U=-RC dt 15
15 (7) 微分运算： u-= u+= 0 R u i o F = − dt du i C i 1 = 1 F i = i dt du u RC i o = − ui － + + uo R R2 i1 iF C ib- =0