我模拟出来的结果,?BJT?都饱和了,?因为第一级和第二级是直接偶合,?第一级的交流输出会影响第二级的直流偏压,?建议改成?电容偶合,?在第一级和第二级中间加一个大电容?10uF,?第二级的?base?再加二个偏压电组,?让?Q2?工作於工作区,?但是这样改会影响低频响应,?不知道这样改是否能接受
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*?Two?Stage?Amplifier
*
.option?post?acout=0?accurate=0?numdgt=10?co=132?INGOLD=1
.paramVCCSupply=12V?VSampl=10uV
VCC?VCC?0?VCCSupply
VS?1?0?SIN(0?VSampl?10K?0?0?0)
RS?1?2?1K
C1?2?3?22U
Rb1?VCC?3?51K
Rb2?3?0?20K
Rc1?VCC?5?5.1K
Q1?5?3?6?Q2N3904
Re1?6?0?2.7K
Ce?6?0?100U
Re2?VCC?7?3.9K
Q2?8?5?7?Q2N3906
Rc2?8?0?4.3K
.model?Q2N3906?PNP(Is=1.41f?Xti=3?Eg=1.11?Vaf=18.7?Bf=180.7?Ne=1.5?Ise=0
+Ikf=80m?Xtb=1.5?Br=4.977?Nc=2?Isc=0?Ikr=0?Rc=2.5?Cjc=9.728p
+Mjc=.5776?Vjc=.75?Fc=.5?Cje=8.063p?Mje=.3677?Vje=.75?Tr=33.42n
+Tf=179.3p?Itf=.4?Vtf=4?Xtf=6?Rb=10)
*$
*Model?for?2N3904?NPN?BJT?(from?eval?library?in?Pspice)
.model?Q2N3904?NPN(Is=6.734f?Xti=3?Eg=1.11?Vaf=74.03?Bf=416.4?Ne=1.259
+Ise=6.734f?Ikf=66.78m?Xtb=1.5?Br=.7371?Nc=2?Isc=0?Ikr=0?Rc=1
+Cjc=3.638p?Mjc=.3085?Vjc=.75?Fc=.5?Cje=4.493p?Mje=.2593?Vje=.75
+Tr=239.5n?Tf=301.2p?Itf=.4?Vtf=4?Xtf=2?Rb=10)
.tran?2ns?2ms?1ms
.PROBE?V(VS)?V(5)?V(8)
.TEMP?25
.op
*.alter
*VS?1?0?dc?1v?ac?0.5?0
*.ac?dec?10?10?10g
.end
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