MOOC Analog Electronics Technique(Huazhong University of Science and Technology)1458237171 最新慕课完整章节测试答案
Lecture 1 The Ideal Operational Amplifier
文章目录
- Lecture 1 The Ideal Operational Amplifier
- Lecture 10 Differential and Multistage Amplifiers
- Lecture 11 Feedback and Stability
- Lecture 12 Applications and Design of Integrated Circuits
- Lecture 2 Semiconductor Materials and Diodes Circuits
- Lecture 3 The Field-Effect Transistor
- Lecture 4 Basic FET Amplifiers
- Lecture 5 The Bipolar Junction Transistor
- Lecture 6 Basic BJT Amplifiers
- Lecture 7 Frequency Response
- Lecture 8 Output Stages and Power Amplifiers
- Lecture 9 Integrated Circuit Biasing and Active Loads
Test questions for The Ideal Operational Amplifier
1、单选题：
The two input terminals of an operational amplifier are labeled as:
选项：
A: high and low
B: positive and negative
C: inverting and noninverting
D: differential and nondifferential
答案: 【 inverting and noninverting】
2、单选题：
For the circuit in the Figure, the output voltage vo is ( ).
选项：
A: -6V
B: -5V
C: -1V
D: -0.2V
答案: 【 -5V】
3、单选题：
For the circuit in Figure, the current ix is ( )
选项：
A: 0.6mA
B: 0.5mA
C: 0.2mA
D: 1/12 mA
答案: 【 0.5mA】
4、单选题：
For the circuit in Figure, current io is( )
选项：
A: -10 μA
B: -2.5 μA
C: 10/12 μA
D: 10/14 μA
答案: 【 -10 μA】
5、单选题：
If vs=8 mV, in the circuit of Figure, the output voltage is( )
选项：
A: -44 mV
B: -8 mV
C: 4 mV
D: 7 mV
答案: 【 4 mV】
6、单选题：
The power absorbed by the 4k ohm resistor in Figure is( ).
选项：
A: 9 mW
B: 4 mW
C: 2 mW
D: 1 mW
答案: 【 4 mW】
7、单选题：
For the circuit in Figure,the output voltage v0 is( ).
选项：
A: 3 V
B: -3 V
C: -1 V
D: -2 V
答案: 【 -3 V】
8、单选题：
For the circuit in Figure,the output current io is( ).
选项：
A: 0.2 mA
B: -0.2 mA
C: 0.1 mA
D: -0.1 mA
答案: 【 -0.2 mA】
9、单选题：
For the circuit in Figure,the output voltage vo is( ).
选项：
A: 5V
B: -5V
C: 3.75V
D: -3.75V
答案: 【 -5V】
10、单选题：
For the circuit in Figure,the output voltage vo is ( )
选项：
A: 5 V
B: -5 V
C: 8 V
D: -8 V
答案: 【 -8 V】
11、单选题：
For the circuit in Figure,the output voltage vo is ( ).
选项：
A: 5 V
B: -5 V
C: 3.8 V
D: -3.8 V
答案: 【 -3.8 V】
12、单选题：
Assume the operational amplifiers are ideal,if the input voltage is +1V，Determine vo=( ).
选项：
A: 1 V
B: -1 V
C: 2 V
D: 0 V
答案: 【 2 V】
13、单选题：
Assume the operational amplifiers are ideal,Determine vo=( );
选项：
A: 1 V
B: -1 V
C: 2 V
D: 0 V
答案: 【 0 V】
14、单选题：
For the circuit in Figure,the output voltage vo is( )
选项：
A: 150 mV
B: 250 mV
C: 350 mV
D: 450 mV
答案: 【 350 mV】
15、单选题：
For the circuit in Figure,the output voltage vo is( )
选项：
A: 3.2 V
B: -0.8 V
C: 2.4 V
D: 1.2 V
答案: 【 2.4 V】
16、单选题：
For the circuits shown as Figure, assume the op-amps is ideal, and the maximun output voltage of all of the op-amps is ±13V, when time is t=0s, give the input voltage is a step in voltage, and the amplitude of the input is 100mV, when time is t=1s, determine the output voltage of each op-amp is( ).
选项：
A: 13 V
B: -13 V
C: 0 V
D: 100 mV
答案: 【 0 V】
17、单选题：
For the circuit in the Figure, the op-amps are ideal, the input resistances of the two circuits are ( )
选项：
A: Ri1=Ri2=1k ohm
B: Ri1<Ri2
C: Ri1>Ri2
D: Ri1=Ri2=∞
答案: 【 Ri1<Ri2】
18、单选题：
Assume all the Op-Amps are ideal, determine vo in terms of vi is （ ）
选项：
A: vo=-0.5(vi+5)
B: vo=0.5(vi+5)
C: vo=2(vi+5)
D: vo=-2(vi+5)
答案: 【 vo=0.5(vi+5)】
19、单选题：
Determine the voltage transfer ratio vo/vs in this op-amp circuit, where R=10k ohm.
选项：
A: -1/3
B: -2/3
C: 1/3
D: 2/3
答案: 【 -2/3】
20、单选题：
Assume all the Op-Amps are ideal, and when time t=0, the capacitor voltage vc=0, then when t=0, vo1=( ), vo2=( ).
选项：
A: vo1=4V,vo2=1V;
B: vo1=-4V,vo2=-1V;
C: vo1=7V, vo2=1V;
D: vo1=7V, vo2=-2V
答案: 【 vo1=7V, vo2=-2V】
21、单选题：
Assume all the Op-Amps are ideal, and when time t=0, the capacitor voltage vc=0, then when
t=( ? )s, the output voltage vo=0.
选项：
A: 1
B: 1/70
C: 1/35
D: 2
答案: 【 1/35】
22、多选题：
For an ideal op amp, which of the following statements are not true?
选项：
A: The differential voltage across the input terminals is zero
B: The current into the input terminals is zero.
C: The current from the output terminal is zero
D: The input resistance is zero
E: The output resistance is zero
答案: 【 The current from the output terminal is zero;
The input resistance is zero】
23、多选题：
Difference amplifiers maybe used in ( ).
选项：
A: instrumentation amplifiers
B: voltage followers
C: buffers
D: summing amplifiers
E: subtracting amplifiers
答案: 【 instrumentation amplifiers;
subtracting amplifiers】
24、判断题：
In the linear operational amplifiers circuit, the inverting input of the operational amplifier is virtual ground.
选项：
A: 正确
B: 错误
答案: 【 错误】
25、判断题：
The voltage gain of the voltage follower is 1, so it can be replaced by a wire.
选项：
A: 正确
B: 错误
答案: 【 错误】
26、判断题：
In the case of open-loop, the integrated operational amplifier must work in the non-linear region.
选项：
A: 正确
B: 错误
答案: 【 正确】
27、填空题：
Assume all the Op-Amps are ideal, determine vo is （ ）V.
答案: 【 5】
Lecture 10 Differential and Multistage Amplifiers
Test questions for Differential and Multistage Amplifiers
1、单选题：
For the circuit in Figure, the DC voltage VCE4 is（ ）V
选项：
A: 1.7
B: 2.7
C: 3.7
D: 4.7
答案: 【 4.7】
2、单选题：
The goal of the design of the differential amplifiers is to ( ).
选项：
A: improve the voltage gain
B: minimize the effect of the common-mode input signal
C: increase the input resistance
D: decrease the output resistance
答案: 【 minimize the effect of the common-mode input signal】
3、单选题：
Consider the circuit shown in Figure. The bipolar transistor parameters are β=100, VBE(on)=0.7V ,VA=∞ for T1 and T2, the T3 and T4 are identical.When RL=∞, determine the differential-mode voltage gain Avd2=vo2/vi=( ).
选项：
A: 49.7
B: -49.7
C: 24.85
D: -24.85
答案: 【 24.85】
4、单选题：
Consider the circuit shown in Figure. The bipolar transistor parameters are β=100,VBE(on)=0.7V ,VA=∞ for T1 and T2, the T3 and T4 are identical.Determine the differential-mode input resistance Rid=( )k ohm.
选项：
A: 16.3
B: 32.6
C: 10.4
D: 12.4
答案: 【 32.6】
5、单选题：
Consider the circuit shown in Figure. The bipolar transistor parameters are β=100,VBE(on)=0.7V ,VA=∞ for T1 and T2, the T3 and T4 are identical.When RL=∞, determine the differential-mode voltage gain Avd2=vo2/vi=( ).
选项：
A: 130.6
B: -130.6
C: 65.3
D: -65.3
答案: 【 65.3】
6、单选题：
Consider the circuit shown in Figure. The bipolar transistor parameters are β=100,VBE(on)=0.7V ,VA=∞ for T1 and T2, the T3 and T4 are identical.Determine the differential-mode input resistance Rid=( )k ohm
选项：
A: 16.3
B: 32.6
C: 10.4
D: 12.4
答案: 【 12.4】
7、单选题：
Consider the circuit shown in Figure. The bipolar transistor parameters are β=100,VBE(on)=0.7V ,VA=∞ for T1 and T2, the T3 and T4 are identical.When RL=∞, determine the differential-mode voltage gain Avd2=vo2/vi=( )
选项：
A: 155.77
B: -155.77
C: 77.88
D: -77.88
答案: 【 77.88】
8、单选题：
Consider the circuit shown in Figure. The bipolar transistor parameters are β=100,VBE(on)=0.7V ,VA=∞ for T1 and T2, the T3 and T4 are identical.Determine the differential-mode input resistance Rid=( )k ohm.
选项：
A: 16.3
B: 32.6
C: 10.4
D: 12.4
答案: 【 10.4】
9、单选题：
Consider the circuit shown in Figure, when two-sided output, the differential-mode voltage gain is vo/vi=-10, and the common-mode voltage gain is very very small, we can not consider this, which output waveform is right ( ).
选项：
A: A
B: B
C: C
D: D
答案: 【 C】
10、单选题：
The common mode rejection ratio of differential amplifier means( )
选项：
A: Ability to suppress zero drift
B: Driving load capacity
C: The value of differential mode gain
D: The value of common mode gain
答案: 【 Ability to suppress zero drift】
11、单选题：
Consider the differential amplifier shown in figure, The phases of vG1 and vo1 are ( ),and the phases of vG1 and vo2 are( ).
选项：
A: in phase, in phase
B: opposite phase,in phase
C: in phase, opposite phase
D: opposite phase, opposite phase
答案: 【 opposite phase,in phase】
12、单选题：
Consider the differential amplifier shown in figure,in the AC equivalent circuit with common mode input signal, the effect of Rs on half circuit is equivalent to( )
选项：
A: short
B: open
C: 2Rs
D: Rs
答案: 【 2Rs】
13、单选题：
Consider the differential amplifier shown in figure ,in the AC equivalent circuit with differential mode input signal, the effect of Rs on half circuit is equivalent to( )
选项：
A: short
B: open
C: 2Rs
D: Rs
答案: 【 short】
14、单选题：
Consider the differential amplifier shown in figure ,when two-sided output, and vo=vo1-vo2,the expression of differential mode voltage gain is （ ）
选项：
A: -β*Rc/rπ
B: β*Rc/rπ
C: -β*Rc/(rπ+Rb)
D: β*Rc/(rπ+Rb)
答案: 【 -β*Rc/(rπ+Rb)】
15、单选题：
For a differential amplifier,the two inputs vi1=30mV, and vi2=10mV,when one-sided output, the output voltage is vo2=1V, and the CMRR= ∞, so the value of differential mode voltage gain is ( )
选项：
A: 30
B: 40
C: 50
D: 60
答案: 【 50】
16、单选题：
The circuit is shown in the figure，then the differential mode voltage gain Avd2=vo2/vid=( ), the CMRR is ( )
选项：
A: 3.85, 77
B: 3.85, 110
C: -3.85, 77
D: -3.85, 110
答案: 【 3.85, 77】
17、单选题：
The circuit is shown in the figure，when the circuit is two-sided output,then the differential mode voltage gain Avd=(vo1-vo2)/vid=( ), the CMRR is ( )
选项：
A: 7, ∞
B: -7, ∞
C: -7.7, ∞
D: 7.7, ∞
答案: 【 -7, ∞】
18、多选题：
which of the following are the characteristics of differential amplifier circuit （ ）
选项：
A: Both the difference mode voltage gain and common mode voltage gain of the circuit are very large;
B: Usually the difference mode voltage gain maybe not very large,but the common mode voltage gain is very very small;
C: The circuit is well matched;
D: The circuit has a strong ability to reject noise;
E: Both the difference mode voltage gain and common mode voltage gain of the circuit are very small;
答案: 【 Usually the difference mode voltage gain maybe not very large,but the common mode voltage gain is very very small;;
The circuit is well matched;;
The circuit has a strong ability to reject noise;】
19、多选题：
Consider the differential amplifier shown in figure,the main function of RE in the circuit is( )
选项：
A: Improve the input resistance of differential mode；
B: Increase common mode input resistance；
C: Increase differential mode voltage gain；
D: Increase common mode voltage gain；
E: Improve common mode rejection ratio CMRR；
答案: 【 Increase common mode input resistance；;
Improve common mode rejection ratio CMRR；】
20、多选题：
The circuit is shown in the figure. If the| vo/v1|=10, the common mode gain is very small and can be think its zero，What is the correct output voltage waveform in the figure.
选项：
A: A
B: B
C: C
D: D
E: E
F: F
答案: 【 C;
E;
F】
21、判断题：
Mismatching of differential amplifier will reduce the common mode rejection ratio.
选项：
A: 正确
B: 错误
答案: 【 正确】
22、判断题：
For differential-mode voltage gain analysis, the one-sided input of differential amplifier is equivalent to the two-sided input.
选项：
A: 正确
B: 错误
答案: 【 正确】
23、判断题：
The one-sided output of differential amplifier is equivalent to the two-sided output.
选项：
A: 正确
B: 错误
答案: 【 错误】
24、判断题：
The CMRR is a parameter to express the voltage amplification ability of amplifier circuit.
选项：
A: 正确
B: 错误
答案: 【 错误】
25、填空题：
Consider the differential amplifier shown in figure, if CMRR=100, and Avd2=vo2/v1=100, v1=20mV, then the ac output vo2=( )mV;
答案: 【 1990】
Lecture 11 Feedback and Stability
Test questions for Feedback and Stability
1、单选题：
For amplification circuits, open loop means ( )
选项：
A: No DC power supply
B: No signal source
C: No feedback path
D: No load
答案: 【 No feedback path 】
2、单选题：
For amplification circuits, closed loop means ( )
选项：
A: With signal source
B: With feedback path
C: With DC power supply
D: With load
答案: 【 With feedback path】
3、单选题：
Find out the feedback path in the circuit shown in the figure and which is positive feedback.
选项：
A: A
B: B
C: C
D: D
答案: 【 D】
4、单选题：
Find out the feedback path in the circuit shown in the figure and which is only ac feedback.
选项：
A: A
B: B
C: C
D: D
答案: 【 D】
5、单选题：
Find out the feedback path in the circuit shown in the figure and determine this feedback
configuration is ( )
选项：
A: negative series-shunt feedback
B: negative shunt-shunt feedback
C: positive series-shunt feedback
D: negative shunt-series feedback
答案: 【 negative series-shunt feedback】
6、单选题：
For the circuit shown in Figure, the feedback path Rf2-Rf1 is ( )
选项：
A: ac negative feedback
B: DC negative feedback
C: ac positive feedback
D: DC positive feedback
答案: 【 DC negative feedback】
7、单选题：
For the circuit shown in Figure, the feedback path T3-Re1 is ( )
选项：
A: ac positive feedback
B: DC positive feedback
C: ac and DC positive feedback
D: ac and DC negative feedback
答案: 【 ac and DC negative feedback】
8、单选题：
For the circuit shown in Figure, the ac feedback between two stages is ( )
选项：
A: Shunt-shunt
B: Shunt-series
C: Series-shunt
D: Series-series
答案: 【 Shunt-shunt】
9、单选题：
For the circuit shown in Figure, the feedback path T3-Rf2-T1 is ( )
选项：
A: ac positive feedback
B: DC positive feedback
C: ac and DC positive feedback
D: ac and DC negative feedback
答案: 【 ac and DC negative feedback】
10、单选题：
For the circuit shown in Figure, the feedback path T2-Rf1-T1 is ( )
选项：
A: DC positive feedback
B: ac positive feedback
C: ac negative feedback
D: DC negative feedback
答案: 【 DC negative feedback】
11、单选题：
If the output current of the feedback circuit tends to be stabilized, and the input resistance tends to be increased, which negative feedback should be used ( ).
选项：
A: Shunt-Shunt
B: Shunt-Series
C: Series-Shunt
D: Series-Series
答案: 【 Series-Series】
12、单选题：
Consider the feedback circuit in Figure , determine the feedback (T3-T1) configuration is ( )
选项：
A: Shunt-Shunt
B: Shunt-Series
C: Series-Shunt
D: Series-Series
答案: 【 Series-Series】
13、单选题：
Consider the feedback circuit in Figure, determine the feedback between two stages configuration is ( )
选项：
A: Shunt-Shunt
B: Shunt-Series
C: Series-Shunt
D: Series-Series
答案: 【 Series-Shunt】
14、单选题：
Consider the feedback circuit in Figure, determine the feedback between two stages configuration is ( )
选项：
A: Shunt-Shunt
B: Shunt-Series
C: Series-Shunt
D: Series-Series
答案: 【 Series-Shunt】
15、单选题：
Consider the feedback circuit in Figure , determine the feedback between two stages configuration is ( )
选项：
A: Shunt-Shunt
B: Shunt-Series
C: Series-Shunt
D: Series-Series
答案: 【 Series-Shunt】
16、单选题：
Consider the feedback circuit in Figure, determine the feedback configuration is ( )
选项：
A: Shunt-Shunt
B: Shunt-Series
C: Series-Shunt
D: Series-Series
答案: 【 Series-Shunt】
17、单选题：
Consider the feedback circuit in Figure, compared with the open loop Ri and Ro, determine the closed-loop Rof and Rif will( )
选项：
A: increase, decrease
B: decrease,increase
C: increase, increase
D: decrease, decrease
答案: 【 increase, decrease】
18、单选题：
Consider the feedback circuit in Figure, determine the feedback between two stages configuration is ( )
选项：
A: Shunt-Shunt
B: Shunt-Series
C: Series-Shunt
D: Series-Series
答案: 【 Shunt-Series】
19、单选题：
Consider the feedback circuit in Figure, if |1+Aβ|>>1,determine the closed-loop gain io/is is ( )
选项：
A: -8.8
B: 8.8
C: -5
D: -6
答案: 【 8.8】
20、单选题：
Consider the feedback circuit in Figure, determine the feedback between two stages configuration is ( )
选项：
A: Shunt-Shunt
B: Shunt-Series
C: Series-Shunt
D: Series-Series
答案: 【 Series-Series】
21、单选题：
Consider the feedback circuit in Figure, if |1+Aβ|>>1,determine the closed-loop gain io/vs is ( )
选项：
A: 98ms
B: 100ms
C: -100ms
D: -98ms
答案: 【 100ms】
22、单选题：
Consider the feedback circuit in Figure, determine the feedback between two stages configuration is ( )
选项：
A: Shunt-Shunt
B: Shunt-Series
C: Series-Shunt
D: Series-Series
答案: 【 Shunt-Shunt】
23、单选题：
Consider the feedback circuit in Figure , if |1+Aβ|>>1,determine the closed-loop gain vo/is is ( )
选项：
A: 25k ohm
B: -25k ohm
C: 5k ohm
D: -5k ohm
答案: 【 -25k ohm】
24、单选题：
Consider the feedback circuit in Figure, determine the feedback between two stages configuration is ( )
选项：
A: Shunt-Shunt
B: Shunt-Series
C: Series-Shunt
D: Series-Series
答案: 【 Shunt-Shunt】
25、多选题：
In the case of constant input, if feedback is introduced, which means that negative feedback is introduced.
选项：
A: output increase
B: input resistance increase
C: net input increase
D: net input decrease
E: output decrease
答案: 【 net input decrease;
output decrease】
26、多选题：
Which of the following are the advantages of negative feedback?( )
选项：
A: the closed-loop gain decreases
B: the circuit may oscillate
C: Gain sensitivity is improved
D: Can extand bandwidth
E: Can reduce nonlinear distortion
答案: 【 Gain sensitivity is improved;
Can extand bandwidth;
Can reduce nonlinear distortion】
27、多选题：
Which of the following are the disadvantages of negative feedback?( )
选项：
A: the closed-loop gain decreases
B: the circuit may oscillate
C: Gain sensitivity is improved
D: Can extand bandwidth
E: Can reduce nonlinear distortion
答案: 【 the closed-loop gain decreases;
the circuit may oscillate】
28、多选题：
Find out the feedback path in the circuit shown in the figure and which is negative feedback.
选项：
A: A
B: B
C: C
D: D