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