第十三章测试1.
The feedback circuit connection shown here is （ ）.
A:voltage series feedback B:voltage shunt feedback C:current series feedback D:current shunt feedback
答案:A
2.
Calculate the voltage gain for voltage series feedback when the amplifier gain is A = -2000 and F = -1/50. （ ）
A:-2000 B:-48.78 C:-1/50 D:50 3.
Calculate the input impedance for voltage series feedback when the amplifier has 
= 10 kΩ, amplifier gain is A = -2000, and F= 
. （ ）
A:input impedance with feedback 410 kΩ B:input impedance with feedback 10 kΩ C:input impedance with feedback 244 Ω D:input impedance with feedback 50 Ω 4.
The output impedance of current-shunt feedback amplifier （ ） the output impedance of its op-amp.
A:is increased when compared to B:is decreased when compared to C:is reduced by half when compared to D:has no effect on 5.
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? （ ）
A:18.88 MHz B:10.59 MHz C:200 MHz
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