單項(xiàng)選擇題

電路如圖所示,管子的Ube=0.7V,則動(dòng)態(tài)參數(shù)的表達(dá)式正確的是()

A.Au=βRL/rbe;ri=R1∥(R1+rbe);r0=R2∥Rc;
B.Au=-βRL/rbe;ri=R1∥rbe;r0=R2∥Rc;
C.Au=-βRL/rbe;ri=rbe;;r0=R2∥Rc
D.Au=-βRL/rbe;ri=R1∥rbe;r0=Rc;


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1.單項(xiàng)選擇題

電路如圖所示,管子的Ube=0.7V,則靜態(tài)參數(shù)的表達(dá)式正確的是()

A.Ib=Ec-0.7/R1+R2+(1+β)Rc;Ic=βIb;Uce=Ec-(1+β)IbRc
B.Ib=Ec-0.7/R1-R2+(1+β)Rc;Ic=βIb;Uce=Ec-+1+β)IbRc;
C.Ib=Ec+0.7/R1+R2+(1+β)Rc;Ic=βIb;Uce=Ec-(1+β)IeRc;
D.Ib=Ec-0.7/R1+R2+(1+β)Rc;Ic=βIb;Uce=Ec-+1+β)IcRc;

4.單項(xiàng)選擇題

電路如下圖所示,已知Ube=0.6V,二極管的導(dǎo)通電壓UD=0.6V,β=50;rbb=174Ω;Rb=240KΩ;Rc=2KΩ;RL=2KΩ;Ec=6V;C1=C2=10μF其靜態(tài)參數(shù)的最佳選項(xiàng)是()

A.Ib=0.02mA;Ic=1mA;Uce=3.4V;
B.Ib=0.2mA;Ic=0.1mA;Uce=0.34V;
C.Ib=2mA;Ic=10mA;Uce=34V;
D.Ib=0.02mA;Ic=10mA;Uce=13.4V;

5.單項(xiàng)選擇題

在下圖電路中,當(dāng)Rb=20KΩ,Re=1KΩ,RL=500Ω,E=16V,C1=C2=20μF時(shí),其動(dòng)態(tài)參數(shù)值的最佳選項(xiàng)是()

A.Au≈10;ri=92KΩ;r0≈84Ω
B.Au≈1;ri=9.2KΩ;r0≈8.4Ω
C.Au≈0.1;ri=0.92KΩ;r0≈0.84Ω
D.Au≈1;ri=92KΩ;r0≈84Ω