A. 100,0.009 B. 1000,0.1 C. 100,0.01 D. 1000,0.009B在放大电路中引入负反馈,可以提高放大电路稳定性

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问题

选项 A. 100,0.009 B. 1000,0.1 C. 100,0.01 D. 1000,0.009

答案B

解析在放大电路中引入负反馈,可以提高放大电路稳定性,故有:[img]/upload/tiku/37/5850678_1.jpg[/img]代入参数可知1+AF=100,又[img]/upload/tiku/37/5850678_1_1.jpg[/img](将20dB转换为倍数为10倍),故A=100×10=1000,F=(100-1)/1000=0.099。
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