(2)电压增益 BR R 1 ;Vbe+(1+β)ReR+R 100×2 8.2 0.8 1.66+101×22+8.2 02 (1+B)R Ri 2 1Ve+(1+β)R2R+Ra 101×2 8.2 166+101×22+820.8 R,=Pmbe+Rh1∥/Rh2∥/R ≈31g (1+B) Blb RoIR 2kQ2 (4输出电阻Rn和Rn Re v (1+β) Rb（2）电压增益 0.8 2 8.2 8.2 1.66 101 2 100 2 (1 ) 1 1 1 = − +  +  −  = +  + + − = =  = s i i b e e c s i i o s o V R R R r R R V V V V V V A   0.8 2 8.2 8.2 1.66 101 2 101 2 (1 ) (1 ) 2 2 2 = +  +   = +  + + + = =  = s i i b e e e s i i o s o V R R R r R R V V V V V V A   + – e Vi Rb1 rbe b I b Ic Rc + – Rs c I b Rb2 (1+)I b Rb Re Vo2 Vo1 + – Vs – + Ro1=Rc=2k   + + = 31 (1 ) // // // 1 2 2  be b b s o e r R R R R R （4）输出电阻Ro1和Ro2