2021知到答案【 模拟电子技术基础（西安邮电大学版）】智慧树网课章节测试答案

1、第 页2021知到答案【 模拟电子技术基础（西安邮电大学版） 】智慧树网课章节测试答案 第二章 章节测试】第十一章 章节测试 1、选择题:If the input voltage is 0.25 V and the output is -2.5 V, the value ofmust be （ ）.选项：A:40.0 kB:20.0 kC:16.0 kD:5.0 k答案: 【20.0 k】2、选择题:The output voltage, VO, is given by （ ）.选项：A:B:C:答案: 【】3、选择题:A summing integrator is an op-amp int

2、egrator that has （ ）.选项：A:multiple feedback capacitorsB:multiple input resistorsC:multiple input resistors and feedback capacitors答案: 【multiple input resistors and feedback capacitors】4、选择题:A second order low-pass filter has a high-end roll-off of （ ）.选项：A:60 dB/octaveB:40 dB/decadeC:20 dB/octaveD:6

3、 dB/decade答案: 【40 dB/decade】5、选择题:An active filter that provides a constant output for input signals above is called an ideal （ ）.选项：A:low-pass filterB:high-pass filterC:bandpass filter答案: 【high-pass filter】第十二章 章节测试 1、选择题:A class B amplifier (not push-pull) （ ）.选项：A:conducts through 360 of the inpu

4、t waveformB:conducts through 180 of the input waveformC:conducts between 180 and 360 degrees of the input waveform, depending on the amount of dc biasD:conducts through less than 180 of the input waveform答案: 【conducts through 180 of the input waveform】2、选择题:Crossover distortion in class B amplifiers

5、 is prevented by （ ）.选项：A:biasing the transistors deeply into cutoffB:biasing the transistors slightly above cutoffC:using complementary-symmetry transistorsD:increasing the load resistance答案: 【biasing the transistors slightly above cutoff】3、选择题:The maximum theoretical efficiency of an RC-coupled cl

6、ass A amplifier is （ ）.选项：A:25%B:50%C:78.5%D:99%答案: 【25%】4、选择题:Power amplifiers are typically used to drive low impedance loads.（ ）选项：A:对B:错答案: 【对】5、选择题:The power that an amplifier delivers to a load is equal to the difference between the power that the circuit draws from the power supply and the po

7、wer that the circuit dissipates.（ ）选项：A:对B:错答案: 【对】第十三章 章节测试 1、选择题:The feedback circuit connection shown here is （ ）.选项：A:voltage series feedbackB:voltage shunt feedbackC:current series feedbackD:current shunt feedback答案: 【voltage series feedback】2、选择题:Calculate the voltage gain for voltage series f

8、eedback when the amplifier gain is A = -2000 and F = -1/50. （ ）选项：A:-2000B:-1/50C:50D:-48.78答案: 【-48.78】3、选择题:Calculate the input impedance for voltage series feedback when the amplifier has = 10 k, amplifier gain is A = -2000, and F= . （ ）选项：A:input impedance with feedback 10 kB:input impedance wit

9、h feedback 410 kC:input impedance with feedback 244 D:input impedance with feedback 50 答案: 【input impedance with feedback 410 k】4、选择题:The output impedance of current-shunt feedback amplifier （ ）the output impedance of its op-amp.选项：A:is increased when compared toB:is decreased when compared toC:is reduced by half when compared toD:has no effect on答案: 【is increased when compared to】5、选择题:An amplifier has a gain-bandwidth product of 200 MHz. A feedback network is added that has a feedback factor