大工12秋《模拟电子线路》在线作业三（Great works 12 autumn analog electronic circuit online homework three）.docVIP

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大工12秋《模拟电子线路》在线作业三（Great works 12 autumn analog electronic circuit online homework three）.doc

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大工12秋《模拟电子线路》在线作业三（Great works 12 autumn analog electronic circuit online homework three）

大工12秋《模拟电子线路》在线作业三（Great works 12 autumn analog electronic circuit online homework three） In the fall of 12 analog electronic circuits online homework three 1. feedback amplifier (means). A signal path between the input and output of A. There is a reverse signaling transmission in B. circuits In addition to C. and signal amplifying circuit outside There is a reverse transmission path so that the input signal weakened D. circuit Answer: B score: 6 points score: 6 The 2. argument judgment method of voltage and current feedback error is (). A. commonly used method is the output short circuit method B. RL=0 (or vo=0), if the feedback signal does not exist, it is voltage feedback C. RL=0 (or vo=0), if there is still a feedback signal is current feedback D. the current negative feedback can stabilize the output voltage Answer: D score: 6 points score: 6 3. the following about the effect of negative feedback on the performance of the amplifier is wrong (). A. amplifier closed-loop gain increased Af To improve the stability of B. amplifier gain Pass band C. amplifier has been expanded D. negative feedback amplifying circuit of all the performance impact and relevant feedback depth (1+AF) Answer: A score: 6 points score: 6 4. in the amplifying circuit, the following statement is wrong (). A. to the static working point, can be introduced into the direct current negative feedback B. to achieve stable output voltage, voltage negative feedback should be introduced C. to stable amplifier gain, introducing AC negative feedback D. to achieve stable output current, should introduce a series of negative feedback Answer: D score: 6 points score: 6 5. known sine wave oscillation circuit RC series parallel frequency selective network, R=10k, C=0.01 F, then the circuit of the oscillation frequency (f0=). A. 343Hz B. 856.7Hz C. 1591.5Hz D. 2618.1Hz Answer: C score: 6 points score: 6 6. introduction parallel voltage negative feedback (). A. input and output resistance increased B. input a