T2管源极缺少电阻。 第三题 1.T1为共发射极组态、T2为共基极组态、T3为共集电极组态 2. VBl=VCC =3.43 R1+R2+R3 R2+R V82=vcc R1+R2+R3 lc VE3=1.384mA R VEI=VBI-VBE= 2. 73v VE2= VCI=VB2-VBE= 7.87V rbel=200+(1+B 3.085k IE ICI=Ic2= Rs=0.91mA rbe2=200+(1+B)=3.085k c2=B3=ICc-lc2R4=14.54 VCEI=VCI-VEI=5.141 rbe=200+(1+B),=2078k cn=2-lE2=667 JE3=IB3-BE=13.84 Bi b2 R 4 R2TR3 R Ri2 1+B Ri3=I'be3+(1+B)R6//RL=500k Avi= A2=BR∥R2=20 A2=_(+D)R6R rhe3+(1+B)R6∥RL Av= AvlAv2 Av3=-200 R=R2∥R3∥rbel=1.6k R4 ∥/R6=809 第四题T2 管源极缺少电阻。 第三题 1． T1 为共发射极组态、T2 为共基极组态、T3 为共集电极组态。 2． V R R R R VB VCC 3.43 1 2 3 3 1 = + + = V R R R R R VB VCC 8.57 1 2 3 2 3 2 = + + + = VE1 =VB1−VBE = 2.73V VE2 =VC1 =VB2 −VBE = 7.87V mA R V I I E C C 0.91 5 1 1 = 2 = = VC2 =VB3 =VCC − IC2R4 =14.54V VCE1 =VC1−VE1 = 5.14V VCE2 =VC2 −VE2 = 6.67V VE3 =VB3 −VBE =13.84V 3． k r R be i 0.03 1 2 2 = + =  Ri3 = rbe3 + (1+ )R6 // RL = 500k 1 1 2 1 = − = − be i V r R A  200 // 2 4 3 2 = = be i V r R R A  1 (1 ) 6 // (1 ) 6 // 3 3 = + + + = r R RL R RL A be V   AV = AV1AV 2AV3 = −200 Ri = R2 // R3 //rbe1 =1.6k =  + + = // 80 1 6 3 4 R r R R be O  第四题 mA R V I E C 1.384 6 3 3 = = k I V r E T be 200 (1 ) 3.085 1 1 = + +  = k I V r E T be 200 (1 ) 3.085 2 2 = + +  = k I V r E T be 200 (1 ) 2.078 1 1 = + +  = R6 R2 R3 rbe2 R4 Vi  be3 r be1 r b3 i b3 i b1 i b1 i Ri Ri2 Ro b2 i b2 i Ri3 VO  R RL 6 R2 R3 rbe2 R4 Vi  be3 r be1 r b3 i b3 i b1 i b1 i Ri Ri2 Ro b2 i b2 i Ri3 VO  RL