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电工与电子技术基础

电工与电子技术基础

求静态工作点:先瞎禅拦用戴维袭基南简化基极偏置电路:Ubo=15x3/(56+3)=0.763V等效Rbo=3//56=2.85KIbq=(0.763-0.7)V/2.85K=0.022mAIc=βIb=1.76mARL=∞,Vce=15-IcRc=15-1.76x5=6.2VRL=3K,Vce=15-IcRc-(Vce/RL)Rc=15-1.76x5-(5/3)Vce解出Vce=2.33VAv=-βRL`/rberbe=100+26mV/Ibq=100+26/0.022=1282ΩRL=∞,Av=-80x5/1.282=-312RL=3K,Av=-80x(5//磨胡3)/1.282=-117解毕