电路可简化等效为 设 RB2 Vcc 20K V=R+R ×12V=2V 100K+20K R1RB2- R=Ru //Ro2=m+Rg2 100K×20K =16.67K 100K+20K 16.67KB +2V① VBEQ +12V电路可简化等效为 设 V V K K K V R R R V CC B B B T 12 2 100 20 20 1 1 2  = + = + = K K K K K R R R R R R B B B B T B B 16.67 100 20 100 20 R 1 2 1 2 1 2 = +  = + = ∥ = RT 16.67K VCC +12V RC 1K T VT +2V B VCEQ VBEQ