解: (1)2=B +15V R2 V3、V组成镜像恒流源l3=c4所以 1+ R239K (2)VV组成微电流恒流源 R1 In 15v
4-1 解: 1 2 1 1 1 2 2 4 3 3 2 3 3 4 3 4 2 2 ln 2 2 1 2 30 2 1 C R C T R C C C R C C C B E R I I I U R V V I I I I I I V V I I R U I = + = + = = = − = ( ) 、 组成微电流恒流源 、 组成镜像恒流源 所以 ()
4-2 R V、V2组成比例恒流源 R ,2R2 C2 V、V组成比例恒流源 R 1 ,3R3 C4 2R
4-2 4 3 2 1 1 0 4 1 2 3 0 4 4 3 3 4 2 1 1 2 1 , , 3 1 3 2 1 2 C C C C C C i i C C C C C C C C I I I I I I I I I I I I I I R R I I V V R R I I V V = = = = = = 、 组成比例恒流源 、 组成比例恒流源
CC R BEl R=Ur In-1 s rID e U In r C2≈ R2 R R R
4-3 2 2 2 2 1 2 2 ln ln ln 1 1 1 R I I U R I I U I I I I U I R U I I S r T S E T C R S E B E R T E r = = =
4-5 XLEE-U 解:(1)Icz-2KE BE 根据戴维南定理将原电路化简 U。R L Rc+Ru RI R R RC=R‖R CE20 cC-Ic20Rc+0.7 (2)K nd⊥RB++B·2R CMR =-|= EE C 2(Rg+/) BRd=2(RB+re), roc=Ro
4-5 i d B b e O C C B b e B b e E u C u d CMR CE Q CC C Q C C C L C L CC L CC E E E B E C Q R R r R R R r R r R A A K U U I R R R R R R U R U R U U I = + = + + + • = = = − + = + = − = (3) 2( ), 2( ) 2 (2) | | 0.7 || 2 1 1 ' 2 ' 2 ' ' 2 根据戴维南定理将原电路化简 解:()
R R B + R B EE
4-6 RU 解:(1)UgR+R2 R Un-U El0 E20 26 rbl=e2=6(l+) ElO R R2 BR il 7be RU, 20×15 R1+R210+20 Ua1=Uc-lcR=15-1×6=9 共模输入电压应:-10<U<9 (4)R↑→U2→l34→lg→mn↑ A减小,R增大
4-6 减小, 增大 共模输入电压应: 解:() u d i d R E E Q b e i C C CC CQ C E E B b e C i i u d E Q b e b e b b E Q E Q C R B E C E E E R A R R U I I r V U V U U I R V R R RU U r R U U U A I r r r I I I R U U I I R R R U U − = − = − = = − + = − + = = − − = = = + + = = − = + = 1 2 3 1 1 1 1 2 1 3 1 2 1 0 1 1 2 1 2 3 3 2 3 3 1 2 2 2 (4) 10 9 15 1 6 9 10 10 20 20 15 (3) 26 (1 ) 2 1 1 '
4-7 解:(1)I≈l4 DQ=2×0.5=1m EE BE +15V R D 10K (2)A R gmRo 15V EE
4-7 m D i u d R r CC E E B E r R r C C D Q g R U U A I U U U R I I I I m A = = − − − = = = = 0 4 3 (2) 解:(1) 2 2 0.5 1
4-8 B,R Rn+ CC el R 470K R.470K R be2 1+B2 26 26 hl=fb+(+B),≈2001 E10 0.013 R B2R B R B IK A,=A.n×A B,R2. o 26 di d2 RB+rel β1xbB8g=Re+rhal R EE Rn tr
4-8 1 1 2 2 2 2 1 1 2 1 1 1 2 1 2 2 2 2 1 1 1 2 2 2 1 1 2 1 1 0.013 26 2001 26 (1 ) 1 ' b e C b e b e C b e b e C b e i u d u d u d b e C u d E Q b e b b b e i b e i u d R r R r r R R r r R R r R A A A r R A I r r r R R r R A + − + + = − + = = − = = + + + = + = − B B B B
4-9 10K R 10K 2.1K 解:(1)L EE e3 C3 R C3 RB E3 R+0.7 +3K 3K Ⅰ=2L,=2×=k R R Cl -15V (2)R2=3+(1+B)Rg EE 1/(Rc‖R BR c 3 2 RB+rel 1be3+(1+ B)RE
b e E C B b e C i u i b e E CR C R E E C E E E C r R R R r R R A R r R RU I I U I R RU I IC C ( 1 ) ( || ) 21 ( 2 ) ( 1 ) 2 2 0.7 1 3 3 1 2 2 3 1 1 3 3 3 3 1 1 + + − + = − = + + = = = + 解:( ) = 4 - 9 R C
4-10 R lid 差动放大器的电压传输特性曲线 解: 10 (1)由于Ua=12>4U7r≈0.7, 电路呈现限幅特性 (2)当R变为10k2时, -10 l值接近±15
4-10 差动放大器的电压传输特性曲线 u V R k U V U V C i d T 15 2 10 1 1.2 4 0.1 , 0 = 值接近 ( )当 变为 时, 电路呈现限幅特性 ()由于 解: u0 /V t -10 10