【单选题】在图2-1中,UCC=12V,RC=3KΩ,β=50,UBE可忽略,若使UCE=6V,则RB应为( )
【简答题】图1所示基本共射放大电路中,已知 Ucc=12V, UBE= O. 7V, Rc = 3kΩ,β=50,rbb' =300Ω, C1和C2足够大。试求: (1)若静态时Uceq=6V ,Rb =? (2)不接负载时Au=? (3)若Rl=3kΩ,Au=?
【简答题】在图15.25所示的分压式偏置放大电路中,已知U CC =15V,R C =3kΩ,R E =2kΩ,I C =1.55mA,β=50,试估算R B1 和R B2 (取附录H标称值)。
【简答题】三极管接成图2-5所示电路,已知在图2-5(a)中,β=50,R b =475kΩ,R c =3kΩ,U CC =+15V。在图2-5(b)中,β=100,R b =260kΩ,R c =2kΩ,R e =500Ω,U CC =+10V。设三极管的U BE =0.7V,求电路的静态工作点。
【单选题】According to the interviewee, how do bacteria develop resistance?
A.
Some bacteria are so strong that drugs can't get into the cells.
B.
Some bacteria are able to drive the drugs out of their cells.
C.
Some bacteria are able to hide behind other ones.
D.
Some bacteria can reproduce before they are killed by drugs.
【单选题】在图2-1中,UCC=12V,RC=3KΩ,β=50,UBE可忽略,若使IC=1.5mA,则RB应为( )。