第十三章 FEEDBACK CIRCUITS：介绍负反馈放大电路的概念，分类和工作原理。13.1负反馈放大电路的概念及分类:本节课介绍了负反馈的概念和分类。[单选题]Calculate the voltage gain for voltage series feedback when the amplifier gain is A = -2000 and F = -1/50. （ ）选项:[-2000, -48.78, 50, -1/50]
13.2瞬时极性法:正确判断反馈的性质是研究反馈放大电路的基础，本节主要介绍采用瞬时极性法来判断正反馈还是负反馈。
13.3反馈组态的判断:本节主要来来判断电路引入反馈，是直流反馈还是交流反馈。
13.4四种组态负反馈电路的性能分析:本节主要介绍负反馈放大电路的四种基本组态的性能指标。
13.5深度负反馈的计算:本节主要介绍负反馈放大电路的方块图及其一般表达式。
13.6负反馈放大电路对性能的影响:本节主要介绍负反馈对放大电路性能的影响，放大电路中引入交流负反馈后，性能会得到多方面的改善。
13.7负反馈放大电路对带宽的影响及本章总结:本节主要介绍负反馈放大电路对带宽的影响，并对本章进行总结。
[单选题]Calculate the input impedance for voltage series feedback when the amplifier has
= 10 kΩ, amplifier gain is A = -2000, and F= 
. （ ）选项:[input impedance with feedback 410 kΩ, input impedance with feedback 50 Ω, input impedance with feedback 10 kΩ, input impedance with feedback 244 Ω][单选题]The output impedance of current-shunt feedback amplifier （ ） the output impedance of its op-amp.选项:[is reduced by half when compared to, has no effect on, is increased when compared to, is decreased when compared to]
[单选题]The feedback circuit connection shown here is （ ）.
选项:[voltage series feedback, current shunt feedback , voltage shunt feedback, current series feedback ][单选题]An amplifier has a gain-bandwidth product of 200 MHz. A feedback network is added that has a feedback factor (1 + βA) of 18.88. What is the gain-bandwidth product for the circuit with the added feedback network? （ ）选项:[10.59 MHz , 200 MHz, 18.88 MHz]
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