例T、T2、T均为硅管 Ri B1=B2=50,B3=80, 12 lCI Rc2 R R 3 当v=Q时 OV 10kg什10k 3ko 求: T3 (1)l C31C21E、CE3、CE2 lKo 及R2的值; Rb2 R lkQ (2)4 R VD2 V29 10kQ c3 (3)当v=5mV时,vo=? -12 (4)当输出接_12kΩ负载时 的电压增益. 解:(1)静态l 0-(-12V ImA CE3 C3 B3=0-(12v-3Ra3)=-9V Hoiv配 BACKNEXT
(4)当输出接一12k负载时 的电压增益. 解: 求: 1mA 0 ( 12V) c3 C3 = − − = R I VCE3 =VC3 −VE3 = 0− (12V − I E3Re3 ) = −9V +12 + - vo -12 Rc1 Rc2 T1 T2 Re1 iC 1 iC 2 + - vi d T3 Rb1 iE Re2 Rb2 Rc3 i Re3 E3 1k 1k 10k 10k 3k 12k 10k 例 Ri 2 当 时 , 。 , , 、 、 均为硅管, 0 0V 50 80 T T T i O 1 2 3 1 2 3 = = = = = v v (3) 5mV ? (2) ; ; (1) i O V VD2 V2 e2 C3 C2 E CE3 CE2 = = = v v A A A R I I I V V 当 时 , 及 的 值 、 、 、 、 (1)静态
R2+ BE3 R12 C2 =0.37mA R 12 2 lCI c2 R R 3 VcEr=12V-Ic2Re2-ve2 10kg什10k 3ko =12-0.37×10-(-0.7) T3 9V lKo lE=2/12=2lc2=0.74mA Rb2 R lkQ 10kQ R c3 IR1-(-12) 12k9 R 2 -12 E 0.7-0.74x10+12 =5.2kQ 0.74 26mv (2)电压增益3=200+(1+B3) =2.3kQ 26mV be2 200+(1+B2) =3.78k2 Hoiv配 BACKNEXT
= + + = 2.3k 26mV 200 (1 ) E3 be3 3 I r (2)电压增益 +12 + - vo -12 Rc1 Rc2 T1 T2 Re1 iC 1 iC 2 + - vi d T3 Rb1 iE Re2 Rb2 Rc3 i Re3 E3 1k 1k 10k 10k 3k 12k 10k Ri 2 0.37mA c2 E3 e3 BE3 C2 = + = R I R V I 9V 12 0.37 10 ( 0.7) CE2 12V C2 c2 E2 = = − − − V = − I R −V I E = 2I E2 = 2I C2 = 0.74mA = − − + = − − − = 5.2k 0.74 0.7 0.74 10 12 ( 12) E E E e1 e2 I V I R R = + + = 3.78k 26mV 200 (1 ) E2 be2 2 I r
R12=+(l+B3)R3 R12 =2453kQ2 12 lCI c2 R 43/R 3 B2(R2∥R2) 10kg什10k 3ko ≈50 2(The Ru T3 3(R3∥R1) lKo Rb2 k+(l+β3)R R lkQ 10kQ R c3 -3.9 12k9 A2=-195 -12 VD2 (3)v 195×5×10 0.98V (4)R1=12kQ时A2 B3(R3∥R1) 195 rme+(1+/3)R3 A、=-975 Hoiv配 BACKNEXT
= = + + 245 . 3 k ( 1 ) i2 be3 3 Re3 R r (3) +12 +-vo -12 Rc1 Rc2 T1 T2 Re1 iC 1 iC 2 +-vi d T3 Rb1 iERe2 Rb2 Rc3 i Re3 E3 1k 1k 10k 10k 3k 12k 10k Ri 2 50 2 ( ) ( // ) be b1 2 c2 i 2 VD2 + = r R R R A 3.9 ( 1 ) ( // ) be 3 e3 3 c3 L V2 = − + + = − r R R R A A V = AVD2 AV2 = −195 195 5 10 0.98V 3 O = V i = − = − − v A v (4) RL = 12 k 时 1.95 ( 1 ) ( // ) be 3 e3 3 c3 L V2 = − + + = − r R R R A A V = AVD2 AV2 = −97.5