3.52射 极偏 B·(R∥R1)B·(R2∥R1) The +(1+B)R R=Rn1∥R2+(1+B)R]=R1∥R2∥ e Rn RE R R R R Rh Rh 图352射极储置电路的小信号等效电 图352射极信置屯路的小信号赛效电篮 HOME BACK NEXT3.5.2 射 极偏置电 路 be c L be e c L V ( // ) (1 ) ( // ) r R R r R R R A  = − + +  = −       i b1 b2 be e b1 b2 be R = R // R // r + (1+  )R = R // R //r