• 2022-06-06
    ​已知如图所示电路中晶体管的b=100,[img=89x22]1803b4c5846392f.png[/img],[img=86x25]1803b4c58c45b43.png[/img],各电容足够大,对交流信号可视为短路。计算负载电阻[img=23x22]1803b4c593ffe7c.png[/img]不接时的电压放大倍数[img=85x25]1803b4c59b88366.png[/img]和[img=92x22]1803b4c5a3df350.png[/img]时的电压放大倍数[img=85x25]1803b4c59b88366.png[/img]各为__________。‌​[img=276x240]1803b4c5b64af95.png[/img]‌
    A: 0.996,0.498
    B: 0.996,0.992
    C: -0.996,-0.498
    D: -0.996,-0.992