《电路与电子技术》复习题.doc

1、诚信应考,考试作弊将带来严重后果！华南理工大学期末考试电路与电子技术（双语）试卷 考试时间：240 minutes 注意事项：1. 考前请将密封线内填写清楚；2. 所有答案请直接答在答题纸上；3考试形式：开卷；4. 本试卷共 20 题，满分 200 分， 考试时间 240 分钟。 题 号 1 2 3 4 5 6 7 8 总分得 分评卷人1. Summarizes the fundamental laws of the circuit, voltage reference polarity and current reference direction Summarizes the analys

2、is methods of the circuit. the relationship between voltage and current about Inductance and capacitance, the inductance capacitance equivalent calculation. 2. Summarize the formation process and the characteristics of the PN junction, of the structures and principles of the diode and BJT, the struc

3、tures and principles of the NMOSFET and PMOSFET, the characteristics and linear analysis basis of the ideal operational amplifier, voltage comparator. 3.Use Ohms and Kirchhoffs laws on the circuit of Fig.1 to find (a) v x; (b) iin; (c) Is; (d) the power provided by the dependent source. Figure 14. F

4、ind the Thvenin equivalent of the two-terminal network shown in Fig.2Figure 2_姓名 学号学院 专业 座位号 ( 密 封 线 内 不 答 题 )密封线线5，Use nodal analysis to find v4 in the circuit shown in Fig. 3Figure 36. Replace the right-most 7-V source of Fig. 4 with a 3-A source, and assume value of 0.3 for the resistor marked X.

5、 Compute the three mesh currents for the new circuit.Figure 47. With sources iA and vB on in the circuit of Fig.5 and vC = 0, ix = 20 A; with iA and vC on and vB = 0, ix = 5 A; and finally, with all three sources on, ix = 12 A. Find ix if the only source operating is (a) iA; (b) vB; (c) vC. (d) Find

6、 ix if iA and vC are doubled in amplitude and vB is reversed.Figure 58. Determine I1 using source transformation to first simplify the circuit of Fig.6Figure 69. Reduce the network of Fig. 7 to a single equivalent inductance as seen looking into terminals a and b.Figure 710. The network of Fig. 8 st

7、ores 534.8 J of energy when a voltage of 2.5 V is connected to terminals a and b, what is the value of Cx?Figure 811. (a) Find the power factor at which the source in the circuit of Fig.9 is operating. (b) Find the average power being supplied by the source. 6 0 H z1 2 0 V r m s4 1 2 16jFigure 912.

8、Find the time-domain node voltages v1(t) and v2(t) in the circuit shown in Fig.10Figure 1013. Consider the common-source amplifier illustrated in Figure 11，(1) plot small signal equivalent circuit; (2) Compute the voltage gain, input resistance, and output resistance.)(tv RSC1 C2vovinR 2R1 CSRDM1RLi

9、oVVDFigure 1114. Calculation of Common-Emitter Amplifier Performance (a) Find the values of IC and VCE in the circuit of Figure 12 for =100 and =300. VBE =0.7V.(b) Find Av, Avo, Zin, Ai, G, and ZO .(c) Then, if vS (t) =0.001sin (t)V, find an expression for vO (t).(d) Finally, repeat part (a) if the

10、emitter resistor RE is split into RE1=100 and RE2=900, with the bypass capacitor in parallel with RE2.+ 1 5 V1 k C1RERLRsR2 BE7.0Rvin vovs RC1 k 2 k 1 0 k 5 k 5 0 0 Figure 12 Common-emitter amplifier 15 Analyze the emitter follower16 17Analyze the circuit18. Find an expression for the output voltage of the circuit shown in Figure 18.vORLv1R21 0 k 1 0 k 1 0 k 2 0 k 2 0 k R1R3R5R4v2u0 1Figure 18.19. 20. Analyze the circuit