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ELEX > ECAD 1.2 > Flashcards

ECAD 1.2 Flashcards

1
Q

Which of the following electrical
characteristics is not exhibited by an
ideal op-amp?

A. Infinite voltage gain
B. Infinite bandwidth
C. Infinite output resistance
D. Infinite slew rate

A

C. Infinite output resistance

An ideal op-amp exhibits zero output resistance so that output can drive an infinite number of other devices.

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2
Q

In an 8-pin 741 op amp IC, what is pin #6?

(go to ECAD 1.2 album)

A. Inverting input
B. Positive supply
C. Output
D. Non-inverting input

A

C. Output

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3
Q

What is the best choice of IC package
used for experimental purpose?

A. Flat pack
B. Metal can package
C. Transistor pack
D. DIP package

A

D. DIP package

DIP package are used as it is easy to
mount. The mounting does not require
bending or soldering of the leads.

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4
Q

In an 8-pin 741 op amp IC, what is pin #7?

(go to ECAD 1.2 album)

A. Positive supply
B. Output
C. Inverting input
D. Non-inverting input

A

A. Positive supply

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5
Q

What is the general information
specified in ordering an IC?

A. Device type
B. Temperature range
C. All of the mentioned
D. Package type

A

C. All of the mentioned

Generally, in ordering an IC, all the three
informations must be specified.

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6
Q

In an 8-pin 741 op amp IC, what is pin #3?

(got to ECAD 1.2 album)

A. Positive supply
B. Output
C. Inverting input
D. Non-inverting input

A

D. Non-inverting input

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7
Q

How many op-amps will be present in a
typical op-amp package?

A. Nine
B. Four
C. Three
D. Five

A

B. Four

Op-amp package IC consists of single,
dual (two) or Four (quad) op-amps.

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8
Q

Which of these is incorrect for an
operational amplifier?

A. It was originally designed to perform
mathematical operations
B. It has a high voltage gain
C. It is only useful for amplifying AC
signals
D. It is a direct coupled amplifier

A

C. It is only useful for amplifying AC
signals

Operational amplifier is a high voltage
gain, direct coupled amplifier which can
be used to perform mathematical
operations on analog signals. It can be
used to amplify both DC and AC signals.

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9
Q

Which package type is chosen for
military purposes?

A. Ceramic DIP
B. Plastic DIP
C. Metal can pack
D. Plat pack

A

A. Ceramic DIP

Ceramic DIP can be used for high temperature and high performance equipment.

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10
Q

Find the types of temperature range
used for an IC, which can be used only
up to 75°c?

A. Military temperature range
B. Commercial temperature range
C. All of the mentioned
D. Industrial temperature range

A

B. Commercial temperature range

Commercial grade IC can be used up to 75°C. It has the worst tolerance among the three types and is the cheapest available IC.

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11
Q

In an ideal op-amp, which is not true?

A. Input resistance is infinite
B. Slew rate is infinite
C. CMRR is zero
D. Open loop voltage gain is infinite

A

C. CMRR is zero

For an ideal op-amp, the open loop
voltage gain is infinite. The output
resistance is 0 and the input resistance
is infinite. Op-amp has zero input
current, zero offset voltage, infinite
bandwidth, infinite CMRR and infinite
slew rate.

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12
Q

Which grade device is selected for
superior quality performance?

A. None of the mentioned
B. Military grade IC
C. Commercial grade IC
D. Industrial grade IC

A

B. Military grade IC

The military grade devices are always of
superior quality, with tightly controlled
parameters and consequently cost
more.

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13
Q

In an 8-pin 741 op amp IC, what is pin #4?

(go to ECAD 1.2 album)

A. Output
B. Inverting input
C. Negative supply
D. Non-inverting input

A

C. Negative supply

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14
Q

In a scaling adder, the

A. input resistors have values that depend
on the assigned weight of each input
B. feedback resistor is equal to the average of the input resistors
C. input resistors are all the same value
D. ratio Rf/R must be the same for each input

A

A. input resistors have values that depend
on the assigned weight of each input

This summing amplifier will function as a scaling adder if R1 is not equal to R2, and R2 is also not equal to R3 and so on….the weight of each input that will affect the output is equal to the ratio of Rf and its input resistance.

(see the figure at ECAD 1.2 album)

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15
Q

An op-amp integrator has a square-
wave input. The output should be

A. pure dc
B. a square wave
C. a triangle wave
D. a sine wave

A

C. a triangle wave

An op-amp integration do the
mathematical process of integration,
therefore a square-wave input will give a
triangular wave output.

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16
Q

The unwanted characteristics of
amplifier output apart from the desired
output is collectively termed as _____

A. Fault
B. Inefficiency
C. Damage
D. Distortion

A

D. Distortion

Distortion refers to the collective
unwanted characteristics of amplifier
output apart from the desired output

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17
Q

The lowest possible output resistance is
achieved with the

A. differential amplifier
B. voltage-follower
C. noninverting amplifier
D. inverting amplifier

A

B. voltage-follower

Voltage follower is the op-amp
configuration having the highest value for input impedance and lowest value for output impedance.

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18
Q

In an op-amp _____, the input
resistors have values that depend on
the assigned weight of each input.

A. difference amplifier
B. instrumentation amplifier
C. scaling adder
D. inverting combiner

A

C. scaling adder

This summing amplifier will function
as a scaling adder if R1 is not equal
to R2, and R2 is also not equal to R3,and so on….the weight of each input that will affect the output is equal to the ratio of Rf and its input
resistance.

(see the figure at ECAD 1.2 album)

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19
Q

A summing amplifier will output the
average of the inputs if R1=R2=R3=…=R if the value of Rf will be set to a certain value that will result to _= n, where n=number of inputs.

A. Rf
B. R1=R2=R3=…=R
C. /Rf
D. Rf/R

A

D. Rf/R

This summing amplifier will output the
average of the inputs if
R1=R2=R3=…=R and the value of Rf
will be set to a certain value that will
result to Rf/R = n, where n=number of
inputs.

(see the figure at ECAD 1.2 album)

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20
Q

The highest possible input resistance is
achieved with the

A. voltage-follower
B. noninverting amplifier
C. differential amplifier
D. inverting amplifier

A

A. voltage-follower

Voltage follower is the op-amp
configuration having the highest value for input impedance and lowest value for output impedance.

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21
Q

In relation to Operational amplifiers,
_____ refers to the condition wherein there is two different signals in the input terminals of the op-amp.

A. quiet mode
B. differential mode
C. common mode
D. unique mode

A

B. differential mode

In Op-amps:

Differential mode - refers to the
condition wherein there is 2 different
signals in the input terminals of the op-amp.

Common mode - refers to the condition
wherein identical signals appear at the
two input terminals of the op-amp.

22
Q

The feedback path in an ideal op-amp _____ consists of a capacitor.

A. integrator
B. thermistor
C. resonator
D. differentiator

A

A. integrator

This is the circuit diagram of an op
amp integrator:

(see the figure at ECAD 1.2 album)

23
Q

The feedback path in an op-amp
antilogarithmic amplifier consists of a…

A. capacitor
B. resistor
C. diode
D. transistor

A

B. resistor

This is the circuit diagram of an op
amp antilogarithmic amplifier:

(see the figure at ECAD 1.2 album)

24
Q

An ideal operational amplifier should
have infinite value for which of the
following parameters?

A. input impedance
B. slew rate
C. bandwidth
D. all of these choices

A

D. all of these choices

(see the table at ECAD 1.2 album)

25
Q

To convert a summing amplifier to a/an _____, the ratio Rf/R must equal the reciprocal of the number of inputs.

A. voltage follower
B. blocking amplifier
C. averaging amplifier
D. integrating amplifier

A

C. averaging amplifier

This summing amplifier will output the
average of the inputs if
R1=R2=R3=…=R and the value of Rf
will be set to a certain value that will
result to Rf/R = n, where n=number of
inputs.

(see the figure at ECAD 1.2 album)

26
Q

Which of these is incorrect for an
operational amplifier?

A. It was originally designed to perform
mathematical operations
B. It is only useful for amplifying AC
signals
C. It has a high voltage gain
D. It is a direct coupled amplifier

A

B. It is only useful for amplifying AC
signals

Operational amplifier can amplify both
DC and AC signals.

27
Q

The voltage gain of a voltage buffer is

A. 0
B. -5
C. 1
D. -1

A

C. 1

A voltage follower (also called a unitygain amplifier, a buffer amplifier, and an isolation amplifier) is a op-amp circuit which has a voltage gain of 1.

This means that the op amp does not
provide any amplification to the signal.
The reason it is called a voltage follower
is because the output voltage directly
follows the input voltage, meaning the output voltage is the same as the input voltage. Thus, for example, if 10V goes into the op amp as input, 10V comes out as output. A voltage follower acts as a buffer, providing no amplification or attenuation to the signal.

28
Q

To make a basic instrumentation
amplifier, it takes, _____ op-amps and
seven resistors.

A. four
B. one
C. three
D. two

A

C. three

An op amp instrumentation amplifier
is constructed as:

(see the figure at ECAD 1.2 album)

29
Q

The output voltage of a particular op-
amp increases 8 V in 12 ms in response to a step voltage on the input. The _____ is 0.66 V/ms.

A. derivative
B. gain
C. slew rate
D. roll-off rate

A

C. slew rate

The slew rate of an op amp or any
amplifier circuit is the rate of change in
the output voltage caused by a step
change on the input. It is measured as a voltage change in a given time - typically V/ us or V/ ms.

30
Q

In op-amps the parameter unity-gain
frequency is also called

A. unity-gain bandwidth
B. notch frequency
C. cutoff frequency
D. closed-loop bandwidth

A

A. unity-gain bandwidth

UNITY-GAIN BANDWIDTH also called
UNITY-GAIN FREQUENCY is an op-amp
parameter referring to the value of
frequency at which the gain is unity.

31
Q

The input stage of every op amp is a

A. None of these choices
B. Differential- amplifier
C. Push-pull amplifier
D. Common-base amplifier

A

B. Differential- amplifier

(see the figure at ECAD 1.2 album)

32
Q

A voltage summing amplifier has

A. one input and several outputs
B. several inputs and one output
C. several inputs and several outputs
D. one input and one output

A

B. several inputs and one output

The circuit shown is an example of a
voltage summing amplifier:

(see the figure at ECAD 1.2 album)

33
Q

An ideal operational amplifier should
have zero value for which of the
following parameters?

A. PSRR
B. all of these choices
C. CMRR
D. input impedance

A

A. PSRR

(ECAD 1.2 table)

34
Q

In an instrumentation amplifier, the output voltage is based on the _____ times a scale factor.

A. product of the two inputs
B. None of these choices
C. difference between the two inputs
D. summation of the two inputs

A

C. difference between the two inputs

(ECAD 1.2 figure)

35
Q

The output voltage of a voltage buffer is _____ with the input voltage.

A. 180° out of phase
B. 90° out of phase
C. in phase
D. 45° out of phase

A

C. in phase

A voltage follower (also called a unitygain amplifier, a buffer amplifier, and an isolation amplifier) is a op-amp circuit which has a voltage gain of 1.

This means that the op amp does not
provide any amplification to the signal.
The reason it is called a voltage follower
is because the output voltage directly
follows the input voltage, meaning the output voltage is the same as the input voltage. Thus, for example, if 10V goes into the op amp as input, 10V comes out as output. A voltage follower acts as a buffer, providing no amplification or attenuation to the signal.

36
Q

What circuit produces an output that
approximates the area under the curve
of an input function?

A. Differentiator
B. summing amplifier
C. Integrator
D. Comparator

A

C. Integrator

In mathematics, the area under a curve
between two points can be found by
doing integration between the two
points. Therefore, a circuit producing an output that approximates the area under the curve of an input function is called
INTEGRATOR.

37
Q

Open loop gain of an ideal op-amp
equals…

A. closed-loop gain
B. infinite
C. 1
D. 0

A

B. infinite

(ECAD 1.2 table)

38
Q

The feedback path in an ideal op-amp
integrator consists of a..

A. capacitor
B. resistor
C. resonant circuit
D. transistor

A

A. capacitor

This is the circuit diagram of an op
amp integrator:

(ECAD 1.2 figure)

39
Q

In op-amps the input offset current
equals the

A. difference between two base currents
B. collector current divided by the current
gain
C. average of two base currents
D. difference between two base-emitter
voltages

A

A. difference between two base currents

Input offset current refers to the
difference of two base currents, while
input bias currents refers to the average
of the two

40
Q

To make a basic op-amp
instrumentation amplifier, it takes three
op-amps and…

A. five resistors
B. seven resistors
C. seven capacitors
D. five capacitors

A

B. seven resistors

An op amp instrumentation amplifier
is constructed as:

(ECAD 1.2 figure)

41
Q

In relation to Operational amplifiers,
common mode is when…

A. the output signals are in-phase
B. the outputs are connected together
C. an identical signal appears on both
inputs
D. both inputs are grounded

A

C. an identical signal appears on both
inputs

In Op-amps:

Differential mode - refers to the
condition wherein there is 2 different
signals in the input terminals of the op-
amp.

Common mode - refers to the condition
wherein identical signals appear at the
two input terminals of the op-amp.

42
Q

An ideal amplifier should have:

A. high input current
B. moderate gain
C. zero offset
D. high output impedance

A

C. zero offset

(ECAD 1.2 table)

43
Q

An ideal amplifier should have infinite
value for which of the following
parameters?

A. input offset voltage
B. CMRR
C. all of these choices
D. output impedance

A

B. CMRR

(ECAD 1.2 table)

44
Q

In op-amps the input bias current equals
the _____ of the two base currents.

A. sum
B. difference
C. ratio
D. average

A

D. average

Input offset current refers to the
difference of two base currents, while input bias current refers to the average of the two

45
Q

An ideal operational amplifier has

A. infinite bandwidth
B. infinite output impedance
C. zero input impedance
D. All of these choices

A

A. infinite bandwidth

(ECAD 1.2 table)

46
Q

A summing amplifier will output the
average of the inputs if R1=R2=R3=…=R if the value of Rf will be set to a certain value that will result to Rf/R = n, where n = _____

A. number of inputs
B. number of op-amp
C. number of operations
D. number of resistors

A

A. number of inputs

This summing amplifier will output the
average of the inputs if
R1=R2=R3=…=R and the value of Rf
will be set to a certain value that will
result to Rf/R = n, where n=number of
inputs.

47
Q

A non-inverting closed-loop op-amp
circuit generally has a gain factor

A. greater than one
B. of zero
C. equal to one
D. less than one

A

A. greater than one

The closed-loop gain of a non-inverting amplifier is equal to 1+ Rf/Ri. Therefore,whatever the values of Rf and Ri this
gain will never be less than 1.

48
Q

Which of the following op-amp
parameter is usually expressed in V / us
or V / ms?

A. slew rate
B. CMRR
C. roll-off rate
D. PSSR

A

A. slew rate

The slew rate of an op amp or any
amplifier circuit is the rate of change in
the output voltage caused by a step
change on the input. It is measured as a voltage change in a given time -typically V/usorV/ms.

49
Q

Input impedance [Zin(1)] of an inverting
amplifier is approximately equal to:

A. Ri
B. Rf-Ri
C. 00
D. Rf + Ri

A

A. Ri

(ECAD 1.2 figure)

50
Q

In an Op Amp _____ mode gain is
usually very low in value.

A. common
B. single
C. difference
D. unity

A

A. common

For an Op-Amp, common mode gain is
ideally equal to zero.

51
Q

The frequency at which the open-loop
gain is equal to 1 is called…

A. the upper critical frequency
B. the unity-gain frequency
C. the cutoff frequency
D. the notch frequency

A

B. the unity-gain frequency

UNITY-GAIN BANDWIDTH also called
UNITY-GAIN FREQUENCY is an op-amp
parameter referring to the value of
frequency at which the gain is unity.

52
Q

The common-mode rejection ratio
(CMMR) is the ratio of _____ to _____

A. signal voltage, noise voltage
B. the differential voltage gain, the common-mode voltage gain
C. the differential power gain, the common-
mode power gain
D. the ideal voltage gain, the actual voltage
gain

A

B. the differential voltage gain, the
common-mode voltage gain

where;
ApM = differential - mode gain
AcM = common - mode gain
CMRR = common - mode rejection ratio

(ECAD 1.2 album)

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