放大电路如图所示,是用小信号分析法计算电路的电压增益,源电压放大倍数,输入电阻,输出电阻。具体如图
éæå·¥ä½ç¹ï¼VbâVccRb2/(Rb1+Rb2)=15x2.5/12.5=3 V
Ve=3-0.7=2.3V
Ie=2.3/0.75â3mA
rbe=300+(1+β)26mV/Ieâ300+50x26=1.6K
çµåå¢çï¼
Av=-βRc//RL/rbe=-150x2k//1.5k/1.6k=-150x0.875k/1.6k=-82
Ri=10K//2.5K//1.6K=0.889K
Ro=Rc=2K
æºçµåæ¾å¤§åæ°ï¼
Avs=Uo/Us=[Ri/(Ri+Rs)]Av=[0.889K/(0.889K+10K)](-82)â-6.7
Ve=3-0.7=2.3V
Ie=2.3/0.75â3mA
rbe=300+(1+β)26mV/Ieâ300+50x26=1.6K
çµåå¢çï¼
Av=-βRc//RL/rbe=-150x2k//1.5k/1.6k=-150x0.875k/1.6k=-82
Ri=10K//2.5K//1.6K=0.889K
Ro=Rc=2K
æºçµåæ¾å¤§åæ°ï¼
Avs=Uo/Us=[Ri/(Ri+Rs)]Av=[0.889K/(0.889K+10K)](-82)â-6.7
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