Last updated 5 years ago
Vcc=IBRb+UBEV_{cc} = I_B R_b + U_{BE}Vcc=IBRb+UBE
Vcc=ICRc+UCEV_{cc} = I_C R_c + U_{CE}Vcc=ICRc+UCE
IE≈IC=βIBI_E \approx I_C = \beta I_BIE≈IC=βIB
rbe≈300+β26mvICr_{be} \approx 300 + \beta \frac{26 mv}{I_C}rbe≈300+βIC26mv
Au=UoUi=−βib⋅(RC//RL)ib⋅rbe=−β⋅(RC//RL)rbeA_u = \frac{U_o}{U_i} = \frac{- \beta i_b \cdot (R_C // R_L)}{i_b \cdot r_{be}} = \frac{- \beta \cdot (R_C // R_L)}{r_{be}}Au=UiUo=ib⋅rbe−βib⋅(RC//RL)=rbe−β⋅(RC//RL)
AuA_uAu 是放大倍数，对应的还有 AiA_iAi
