撕楞凶剔腾融躬仑辟弊瓮剂官
Chapter10.OPERATIONALAMPLIFIERS
第十章中文测验
1、单选题：
集成运放的输入级一般由▁▁▁▁组成。
A: 差分放大电路
B: 电压放大电路
C: 功率放大电路
D: 偏置电路
答案: 差分放大电路
2、单选题：
差分放大器的两个输入电压分别为Ui1=0.04V，Ui2=0.08V，则其共模输入电压为▁▁▁▁。
A: 0.04V
B: 0.06V
C: 0.08V
D: 0.12V
答案: 0.06V
3、单选题：
差分放大器的两个输入电压分别为Ui1=0.08V，Ui2=0.04V，则其差模输入电压为▁▁▁▁。
A: 0.04V
B: 0.06V
C: 0.08V
D: 0.12V
答案: 0.04V
4、单选题：
典型的差分放大电路由双端输出变为单端输出，共模电压放大倍数（ ）。
A: 变大
B: 变小
C: 不变
D: 无法确定
答案: 变大
5、单选题：
共模抑制比是差分放大电路的一个主要技术指标，它是反映放大电路（ ）的能力。
A: 消除失真
B: 输入电阻高
C: 放大差模，抑制共模
D: 输出电阻低
答案: 放大差模，抑制共模
第十章测验
1、单选题：
Under difference-mode operation, the difference-mode voltage gain for this circuit is _______.
A: 0.0397
B: 80
C: 40
D: 0.08
答案: 40
2、单选题：
The operational amplifier will only slightly amplify signals __ ___.
A: when the supply voltages are more then ±25 V
B: when the supply voltages are less then ±5 V
C: that are common on both the inputs
D: that are different on both the inputs
答案: that are common on both the inputs
3、单选题：
The inverting and noninverting inputs to an op-amp are used to drive a(n) _______ amplifier.
A: inverting
B: noninverting
C: differential
D: open-loop
答案: differential
4、单选题：
When a given op-amp has a common-mode input of 10 V, the output of the device is 10 V. When the device has a differential input of 2 mV, the output of the device is 10 V. What is the CMPR of the device?
A: 5 : 1
B: 5000 : 1
C: 1000 : 1
D: 5,000,000 : 1
答案: 5000 : 1
5、单选题：
The bandwidth of an amplifier is _______.
A: the range of frequencies over which gain remains relatively constant
B: the range of frequencies between the lower and upper 3 dB frequencies
C: the range of frequencies found using f2 – f1
D: All of the above
答案: All of the above
6、单选题：
The main features of a difference pair, such as the circuit shown here, are _______.
A: very high input impedance and very high voltage gain
B: very high input impedance and moderate voltage gain
C: moderate input impedance and very high voltage gain
D: moderate input impedance and moderate voltage gain
答案: very high input impedance and very high voltage gain
7、单选题：
Under common-mode operation, the common-mode voltage gain for this circuit is _______.
A: 0.0397
B: 80
C: 40
D: 0.08
答案: 0.0397
8、单选题：
Under single-ended operation the differential-mode voltage gain for this circuit is ___ ____.
A: 33.33
B: 66.66
C: 133.33
D: 266.66
答案: 66.66
9、单选题：
The common mode rejection ratio (CMRR) is the ratio of _______.
A: the difference mode gain to the common mode gain
B: the common mode gain to the difference mode gain
C: noninverting gain to inverting gain
D: inverting gain to noninverting gain
答案: the difference mode gain to the common mode gain
10、单选题：
For this AC equivalent circuit of an op-amp, the input signal is applied between the input terminals and sees an input impedance Ri. This impedance _______.
A: is a few hundred ohms
B: is a few kilohms
C: is a few hundred kilohms
D: depends on the op-amp used. It could be a few hundred ohms to a few hundred kilohms
答案: is a few hundred kilohms
11、单选题：
Under common-mode operation, the common-mode voltage gain is _______.
A: 0.133
B: 33.33
C: 66.66
D: 0.266
答案: 0.133
12、单选题：
Which of the following statements is true?
A: Op-amps are high-gain dc amplifiers
B: Op-amps have extremely high input impedance.
C: Op-amps have extremely low output impedance.
D: All of the above
答案: All of the above
13、单选题：
In the integrated operational amplifier circuit, the coupling mode is adopted between the circuit of all levels.
A: direct
B: transformer
C: resistance capacitance
D: photoelectricity
答案: direct
14、单选题：
The input stage of an integrated operational amplifier is generally composed of .
A: differential amplifier circuit
B: voltage amplifier circui
C: power amplifier circuit
D: current source
答案: differential amplifier circuit
15、单选题：
The two input voltages of the differential amplifier are Ui1 = 0.04V ,and Ui2 = 0.08V, the common mode input voltage .
A: 0.04V
B: 0.06V
C: 0.08V
D: 0.12V
答案: 0.06V
16、单选题：
The two input voltages of the differential amplifier are Ui1 = 0.04V ,and Ui2 = 0.08V, the differential mode input voltage .
A: 0.04V
B: 0.06V
C: 0.08V
D: 0.12V
答案: 0.04V
17、单选题：
Typical differential amplifier circuit changes from double-ended output to single-ended output, common-mode voltage gain .
A: increase
B: decrease
C: unchanged
D: unable to determine
答案: increase
18、单选题：
Typical differential amplifier circuit changes from double-ended output to single-ended output, differential-mode voltage gain .
A: increase
B: decrease
C: unchanged
D: unable to determine
答案: decrease
19、单选题：
CMRR is a main technical index of differential amplifier circuit, reflects the ability of amplifier circuit.
A: eliminate distortion
B: high input resistance.
C: Enlarging Differential Mode and Suppressing Common Mode
D: low output resistance
答案: Enlarging Differential Mode and Suppressing Common Mode
20、单选题：
Typical differential amplifier circuit changes from double-ended input to single-ended input, common-mode voltage gain .
A: increase
B: decrease
C: unchanged
D: unable to determine
答案: unchanged
21、单选题：
Typical differential amplifier circuit changes from double-ended input to single-ended input, differential-mode voltage gain .
A: increase
B: decrease
C: unchanged
D: unable to determine
答案: unchanged
Chapter11.OP-AMPAPPLICATIONS
第十一章测验
1、单选题：
If the input voltage is 0.25 V and the output is -2.5 V, the value of Rf must be _______.
A: 40.0 kΩ
B: 20.0 kΩ
C: 16.0 kΩ
D: 5.0 kΩ
答案: 20.0 kΩ
2、单选题：
The output voltage, VO, is given by ______.
A: VO = 
B: VO = 
C: VO = 
D: None of the above
答案: VO =
3、单选题：
A summing integrator is an op-amp integrator that has _______.
A: multiple feedback capacitors
B: multiple input resistors
C: multiple input resistors and feedback capacitors
D: None of the above
答案: multiple input resistors and feedback capacitors
4、单选题：
A second order low-pass filter has a high-end roll-off of _______.
A: 60 dB/octave
B: 40 dB/decade
C: 20 dB/octave
D: 6 dB/decade
答案: 40 dB/decade
5、单选题：
An active filter that provides a constant output for input signals above fol is called an ideal _______.
A: low-pass filter
B: high-pass filter
C: bandpass filter
D: None of the above
答案: high-pass filter
6、单选题：
The voltage follower typically has a voltage gain value of _______.
A: 1000
B: 100
C: 10
D: 1
答案: 1
7、单选题：
When the input voltage to this circuit is 0.25 V, the output voltage is _______
A: 10.0 V
B: 5.0 V
C: 3.0 V
D: 1.5 V
答案: 1.5 V
8、单选题：
When the input voltage to this circuit is 0.25 V, the output voltage is _______
A: 10.0 V
B: 5.0 V
C: 3.0 V
D: 1.5 V
答案: 1.5 V
9、单选题：
The operational amplifier circuit shown here is a(n) _______.
A: level comparator
B: differentiator
C: integrator
D: difference amplifier
答案: integrator
10、单选题：
The operational amplifier circuit shown here is a(n) _______.
A: level comparator
B: differentiator
C: integrator
D: difference amplifier
答案: differentiator
11、单选题：
The CMRR of an inverting amplifier always lower than that of its op-amp because _______.
A: the common-mode gain of an op-amp increases when it is used in an inverting amplifier
B: the value of differential gain for an inverting amplifier is lower than that of its op-amp
C: slew-rate limiting decreases the common-mode gain of the op-amp
D: of the lower input impedance of the inverting amplifier
答案: the value of differential gain for an inverting amplifier is lower than that of its op-amp
12、单选题：
The op-amp circuit that add each input and multiplies the sum by a fixed amount is called a(n) ______.
A: unity followe
B: integrator
C: differentiator
D: summing amplifier
答案: summing amplifier
13、单选题：
The op-amp circuit that has a capacitor as the feedback component is called a(n) ______.
A: unity follower
B: integrator
C: differentiator
D: summing amplifier
答案: integrator
14、单选题：
An op-amp integrator circuit has a 2 MΩ input resistor and a 5 μF feedback loop capacitor. If the inverting input voltage is 2 VDC, the final value of the output voltage is _______.
A: -20 V
B: -2 V
C: -0.2 V
D: 0.02 V
答案: -0.2 V
15、单选题：
Op-amp differentiator circuits differ from the integrators in that the differentiators ______.
A: are not as useful
B: have a scale factor of -RC
C: have a resistor in the feedback loop
D: All of the above
答案: All of the above
16、单选题：
An inverting amplifier and a noninverting amplifier are built using the same values of Rf and R1. Assuming that the op-amps being used in the two circuits have identical common-mode gain values, _______.
A: the inverting amplifier has the higher CMRR
B: the noninverting amplifier has the higher CMRR
C: the CMRR is the same for the inverting and noninverting amplifiers
D: None of the above
答案: the noninverting amplifier has the higher CMRR
17、单选题：
An inverting amplifier with +11 V supply voltages normally has a sinusoidal output of 10 VPP. When checking the circuit with an oscilloscope, you find that the output is 0 V. Which of the following could account for this problem?
A: R1 is open.
B: V1 = 0
C: R is shorted by a solder bridge.
D: All of the above
答案: All of the above
18、单选题：
This op-amp is connected as a(n) _______.
A: inverting constant-gain multiplier
B: noninverting constant-gain multiplier
C: voltage buffer
D: None of the above
答案: inverting constant-gain multiplier
19、单选题：
The voltage gain for this circuit is give as _______.
A: A = 1 +
B: A = – 
C: A = 
D: A = –
答案: A = –
20、单选题：
Determine the gain of this circuit.
A: 10
B: 0.1
C: -0.1
D: -10
答案: -10
21、单选题：
What is the design value for Rf?
A: 60 Ω
B: 282 kΩ
C: 78.3 Ω
D: 180 kΩ
答案: 282 kΩ
22、单选题：
If this circuit is to have an inverting voltage gain of 1, the ratio of Rf : R1 should be _______.
A: 1 : 1
B: 2 : 1
C: 1: 2
D: Cannot be done in theory. It can be done in practice by making R1 much larger than Rf.
答案: 1 : 1
23、单选题：
This op-amp is connected as a(n) _______.
A: inverting constant-gain multiplier
B: noninverting constant-gain multiplier
C: voltage buffer
D: None of the above
答案: noninverting constant-gain multiplier
24、单选题：
The voltage gain for this circuit is given as _______.
A: A = 1 + 
B: A = –
C: A = 1 + 
D: A = – 
答案: A = 1 +
25、单选题：
Determine the gain of this circuit.
A: 10
B: -10
C: 11
D: 1.1
答案: 11
26、单选题：
A gain of 7 is required from a noninverting constant-multiplier op-amp circuit. If the input resistor is 5 k Ω, what should be the value of the feedback resistor ?
A: 30 kΩ
B: 15 kΩ
C: 7.5 kΩ
D: 5 kΩ
答案: 30 kΩ
27、单选题：
If this circuit is to have a voltage gain of 1, the ratio of Rf : R1 should be ______.
A: 1 : 1
B: 2 : 1
C: 1: 2
D: It can be done in practice by making R1 much larger than Rf.
答案: It can be done in practice by making R1 much larger than Rf.
28、单选题：
If the input voltage is 0.25 V and the required output voltage is 2.75 V, the value for Rf must be _______.
A: 40.0 kΩ
B: 20.0 kΩ
C: 10.0 kΩ
D: 5.0 kΩ
答案: 20.0 kΩ
29、单选题：
The output voltage, VO, is given by _______.
A: VO = 
B: VO = 
C: VO = 
D: None of the above
答案: None of the above
30、单选题：
For this cascade amplifier, the input voltage swing is 0.2 VPP. Calculate the peak-to-peak swing on the output voltage.
A: 9.6 VPP
B: 4.8 VPP
C: 2.4 VPP
D: 1.2 VPP
答案: 4.8 VPP
31、单选题：
A second order high-pass filter has a low-end roll-off of ______.
A: 60 dB/octave
B: 40 dB/decade
C: 20 dB/octave
D: 6 dB/decade
答案: 40 dB/decade
32、单选题：
This is a basic _______ circuit.
A: differentiator
B: integrator
C: two-input multiplier
D: subtractor
答案: subtractor
33、单选题：
How many feedback resistors are found in a 3-input voltage summing circuit that is constructed around an op-amp?
A: 0
B: 1
C: 2
D: 3
答案: 1
34、单选题：
This circuit is known as a _______.
A: noninverting amplifier
B: voltage buffer
C: low-pass filter
D: high-pass filter
答案: voltage buffer
35、单选题：
The output of an op-amp voltage buffer is characterized by _______.
A: VO = 1
B: VO = 
, where Rf = R1
C: VO = 
D: VO = Vi
答案: VO = Vi
36、单选题：
If all resistances in this circuit are equal, the output is _______.
A: V1 – V2
B: V2 – V1
C: V1 + V2
D: V1 × V2
答案: V2 – V1
37、单选题：
An op-amp high-pass active filter provides a constant output _______.
A: from dc to foh
B: for all frequencies higher then fol
C: from fol to foh
D: from dc to infinite frequency
答案: for all frequencies higher then fol
38、单选题：
An op-amp bandpass active filter provides a constant output _______.
A: from dc to foh
B: for all frequencies higher then fol
C: from fol to foh
D: from dc to infinite frequency
答案: from fol to foh
39、单选题：
The roll-off rate of a second order filter is _______.
A: 60 dB/decade or 18 dB/octave
B: 40 dB/decade or 12 dB/octave
C: 20 dB / decade or 6 dB/octave
D: 0 dB/decade or 0 dB/octave
答案: 40 dB/decade or 12 dB/octave
40、单选题：
A constant-gain multiplier has three stages and a total gain of 22,200. For all three feedback resistors, Rf = 470 kΩ. Two of the R1 resistors have a value of 33 kΩ. What is the gain of the stage where R1 is unknown?
A: 14.2
B: -14.2
C: 110.3
D: -110.3
答案: 110.3
41、单选题：
A constant-gain multiplier has three stages and a total gain of 22,200. For all three feedback resistors, Rf = 470 kΩ. Two of the R1 resistors have a value of 33 kΩ. What is the value of the third R1, and what is the nature of its stage?
A: 4.26 kΩ, ohms, inverting
B: 4.3 kΩ, ohms, noninverting
C: 4.3 kΩ, inverting
D: 4.6 kΩ, noninverting
答案: 4.3 kΩ, ohms, noninverting
42、单选题：
A constant-gain multiplier has three stages and a total gain of 22,200. For all three feedback resistors, Rf = 470 kΩ. Two of the R1 resistors have a value of 33 kΩ. What is the individual gain of the two identical stages where R1 is known?
A: 14.2
B: -14.2
C: 110.3
D: -110.3
答案: -14.2
43、单选题：
Which type of op-amp circuit has unity gain, no phase inversion, high input impedance, and low output impedance?
A: voltage buffer
B: subtractor
C: summing amplifier
D: differentiator
答案: voltage buffer
44、单选题：
An active filter that provides a constant output from dc to foh, and then passes no signal above foh, is called an ideal ______.
A: low-pass filter
B: high-pass filter
C: bandpass filter
D: None of the above
答案: low-pass filter
45、单选题：
An active filter that provides a constant output for input signals from fol to foh is called an ideal _______.
A: low-pass filter
B: high-pass filter
C: bandpass filter
D: None of the above
答案: bandpass filter
Chapter12.POWERAMPLIFIERS
第十二章中文测验
1、单选题：
输入信号只在半个周期内流过放大器件，这种工作方式称为▁▁▁放大。
A: 甲类
B: 乙类
C: 甲乙类
D: 丙类
答案: 乙类
2、单选题：
输入信号在整个周期都流过放大器件，这种工作方式称为▁▁▁放大。
A: 甲类
B: 乙类
C: 甲乙类
D: 丙类
答案: 甲类
3、单选题：
甲乙类互补功率放大器能克服电路出现的 。
A: 零点漂移
B: 交越失真
C: 频率失真
D: 线性失真
答案: 交越失真
4、判断题：
功率放大电路的电压放大倍数小于1，电流放大倍数大于1。（ ）
A: 正确
B: 错误
答案: 正确
5、判断题：
在乙类功率放大器中，随着输入信号的幅度加大，放大器的输出功率和效率也是在一直地增大。（ ）
A: 正确
B: 错误
答案: 错误
6、判断题：
乙类双电源互补对称功率放大器中，最大集电极功耗应发生在输出电压等于电源电压的0.6倍时。（ ）
A: 正确
B: 错误
答案: 正确
7、判断题：
乙类互补对称功率放大器中，效率最大时集电极功耗也最大。（ ）
A: 正确
B: 错误
答案: 错误
8、判断题：
乙类放大电路的工作效率比甲类高。（ ）
A: 正确
B: 错误
答案: 错误
第十二章测验
1、单选题：
A class B amplifier (not push-pull) _______.
A: conducts through 360° of the input waveform
B: conducts through 180° of the input waveform
C: conducts between 180° and 360° degrees of the input waveform, depending on the amount of dc bias
D: conducts through less than 180° of the input waveform
答案: conducts through 180° of the input waveform
2、单选题：
Crossover distortion in class B amplifiers is prevented by _______.
A: biasing the transistors deeply into cutoff
B: biasing the transistors slightly above cutoff
C: using complementary-symmetry transistors
D: increasing the load resistance
答案: biasing the transistors slightly above cutoff
3、单选题：
The maximum theoretical efficiency of an RC-coupled class A amplifier is ______.
A: 25%
B: 50%
C: 78.5%
D: 99%
答案: 25%
4、单选题：
The maximum possible efficiency of a class A amplifier is equal to _______
A: 30%
B: 25%
C: 20%
D: 15%
答案: 25%
5、单选题：
A class B push-pull amplifier _______.
A: conducts through 180° of the input waveform
B: conducts between 180° and 360° degrees of the input waveform, depending on the amount of dc bias
C: conducts through less than 180° of the input waveform
D: works only with digital and pulsed waveforms
答案: conducts between 180° and 360° degrees of the input waveform, depending on the amount of dc bias
6、单选题：
A class A amplifier ______.
A: conducts through 360° of the input waveform
B: conducts through 180° of the input waveform
C: conducts between 180° and 360° degrees of the input waveform, depending on the amount of dc bias
D: conducts through less than 180° of the input waveform
答案: conducts through 360° of the input waveform
7、单选题：
A class C amplifier _______.
A: conducts through 180° of the input waveform
B: conducts between 180° and 360° degrees of the input waveform, depending on the amount of dc bias
C: conducts through less than 180° of the input waveform
D: works only with digital and pulsed waveforms
答案: conducts through less than 180° of the input waveform
8、单选题：
Class C amplifiers are used mostly in ______ circuits.
A: audio
B: power amplifier
C: digital
D: tuned
答案: tuned
9、单选题：
A class D amplifier _______.
A: conducts through 180° of the input waveform
B: conducts between 180° and 360° degrees of the input waveform, depending on the amount of dc bias
C: conducts through less than 180° of the input waveform
D: works only with digital and pulsed waveforms
答案: works only with digital and pulsed waveforms
10、单选题：
With transformer coupling the maximum theoretical efficiency of a class A amplifier can be increased up to _______.
A: 60%
B: 55%
C: 50%
D: 45%
答案: 50%
11、单选题：
A class AB transistor amplifier using complementary transistors is biased by power supply that is ±18Vdc. The value of VCE(OFF) for either transistor is approximately equal to ______.
A: 8 V
B: 10 V
C: 18 V
D: 36 V
答案: 18 V
12、单选题：
Class D amplifiers have a maximum theoretical efficiency of _______.
A: 25%
B: 78.5%
C: 50%
D: over 90%
答案: over 90%
13、单选题：
The crossover distortion in a class B amplifier is prevented by _______.
A: biasing the individual transistors deeply into cutoff
B: biasing the transistors just slightly above cutoff
C: biasing the transistors just slightly into cutoff
D: adjusting the load resistance so that the transistor will turn on and off faster
答案: biasing the transistors just slightly above cutoff
14、单选题：
Class B amplifiers _______.
A: provide an output signal for half the input signal cycle
B: usually contain an LC tank circuit in the BJT collector circuit
C: usually contain a single BJT that conducts through 360° of the ac input cycle
D: usually contain a single BJT that conducts through 270° of the ac input signal
答案: provide an output signal for half the input signal cycle
15、单选题：
A class A amplifier has an 8 VPP output that is being applied to a 200 Ω load. What is the total ac load power?
A: 320 mW
B: 640 mW
C: 40 mW
D: 80 mW
答案: 40 mW
16、单选题：
Impedance matching is important for ____.
A: maximum voltage transfer from source to load
B: maximum power transfer from source to load
C: maximum impedance transfer from source to load
D: maximum current transfer from source
答案: maximum power transfer from source to load
17、判断题：
Power amplifiers are typically used to drive low impedance loads.______
A: 正确
B: 错误
答案: 正确
18、判断题：
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 power that the circuit dissipates.
A: 正确
B: 错误
答案: 正确
Chapter13.FEEDBACKCIRCUITS
第十三章中文测验
1、单选题：
若要稳定输出电压，应该引入▁▁▁▁负反馈。
A: 电压
B: 电流
C: 串联
D: 并联
答案: 电压
2、单选题：
负反馈所能抑制的干扰是▁▁▁▁。
A: 输入信号所包含的干扰
B: 反馈环内的干扰
C: 反馈环外的干扰
D: 不确定
答案:
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