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