Question 1

The most popular integrated circuits and the ICs manufactured with all components being part of one chip are called ________.

Accepted Answer

A)   trivalent
B)   pentavalent
C)   duolithic
D)   monolithic

Question 2

What is the output voltage for the circuit shown in Figure 15-21?

Accepted Answer

A)   15 mV
B)   1.5 mV
C)   0.5 mV
D)   0.5 V

Question 3

In an op amp,the difference of the dc currents is called the

Accepted Answer

A)   input offset current.
B)   input bias current.
C)   difference current.
D)   dc mean current.

Question 4

The input circuit used in most op amps is the

Accepted Answer

A)   preamp.
B)   tuned RF amp.
C)   common-collector.
D)   differential amp.

Question 5

With diff amp configurations,the voltage gain is maximum when a single-ended output is used.

Accepted Answer

A) True 
 B)False

Question 6

The voltage gain of a differential amplifier divided by its common-mode voltage gain is referred to as the

Accepted Answer

A)   input offset voltage.
B)   common-mode rejection ratio.
C)   differential output.
D)   active load ratio.

Question 7

What is the type of IC that is manufactured with resistors and capacitors integrated,but transistors and diodes are connected as discrete components?

Accepted Answer

A)   thin film or thick film
B)   analog
C)   digital
D)   hybrid

Question 8

A diff amp is sometimes called a long-tail pair because the two transistors share a common collector resistor.

Accepted Answer

A) True 
 B)False

Question 9

The diff amp is extremely useful as the input stage of an op amp because

Accepted Answer

A)   it has low input impedance.
B)   it has a single-ended input.
C)   it amplifies the common-mode signal.
D)   it attenuates the common-mode signal.

Question 10

In the manufacturing process of an IC,the procedure of sealing off the epitaxial layer with silicon dioxide is called ________,

Accepted Answer

A)   compensation
B)   sealation
C)   passivation
D)   crystallization

Question 11

The typical op amp is a dc amplifier with very high gain,very high input impedance,and very low output impedance.

Accepted Answer

A) True 
 B)False

Question 12

Which of the following is not a characteristic of an op amp?

Accepted Answer

A)   unity voltage gain
B)   very high input impedance
C)   very high voltage gain
D)   very low output impedance

Question 13

The formula used to convert the CMRR to decibels is

Accepted Answer

A)   10 log CMRR.
B)   20 log CMRR.
C)   30 log CMRR.
D)   40 log CMRR.

Question 14

A differential amplifier output requires that the load is single-ended and has one end grounded.

Accepted Answer

A) True 
 B)False

Question 15

Base resistors can produce input error voltages when the two halves of the diff amp are not perfectly symmetrical.

Accepted Answer

A) True 
 B)False

Question 16

When a differential amplifier is not perfectly symmetrical

Accepted Answer

A)   there will be a small ac output voltage.
B)   there will be no common-mode amplification.
C)   there will be no ac output voltage.
D)   there will be 0 V at the output.

Question 17

The Intel P4 Prescott version microprocessor contains approximately

Accepted Answer

A)   125 transistors.
B)   125 thousand transistors.
C)   125 million transistors.
D)   125 billion transistors.

Question 18

The input bias current of an op amp is defined as the sum of the dc base currents.

Accepted Answer

A) True 
 B)False

Question 19

An amplifier that performs a mathematical operation is referred to as

Accepted Answer

A)   a math amp.
B)   an op amp.
C)   a calc amp.
D)   a comp amp.

Question 20

What can produce input error voltages when the two halves of the diff amp are not perfectly symmetrical?

Accepted Answer

A)   collector resistors
B)   emitter resistors
C)   base resistors
D)   coupling capacitors

Exam 15: Differential Amplifiers

The input circuit used in most op amps is the

Correct AnswerverifiedShow Answer

The most popular integrated circuits and the ICs manufactured with all components being part of one chip are called ________.

Correct AnswerverifiedShow Answer

With diff amp configurations,the voltage gain is maximum when a single-ended output is used.

Correct AnswerverifiedShow Answer

The Intel P4 Prescott version microprocessor contains approximately

Correct AnswerverifiedShow Answer

The diff amp is extremely useful as the input stage of an op amp because

Correct AnswerverifiedShow Answer

Which of the following is not a characteristic of an op amp?

Correct AnswerverifiedShow Answer

In an op amp,the difference of the dc currents is called the

Correct AnswerverifiedShow Answer

Base resistors can produce input error voltages when the two halves of the diff amp are not perfectly symmetrical.

Correct AnswerverifiedShow Answer

In the manufacturing process of an IC,the procedure of sealing off the epitaxial layer with silicon dioxide is called ________,

Correct AnswerverifiedShow Answer

The formula used to convert the CMRR to decibels is

Correct AnswerverifiedShow Answer

What is the output voltage for the circuit shown in Figure 15-21?

Correct AnswerverifiedShow Answer

The typical op amp is a dc amplifier with very high gain,very high input impedance,and very low output impedance.

Correct AnswerverifiedShow Answer

The voltage gain of a differential amplifier divided by its common-mode voltage gain is referred to as the

Correct AnswerverifiedShow Answer

What is the type of IC that is manufactured with resistors and capacitors integrated,but transistors and diodes are connected as discrete components?

Correct AnswerverifiedShow Answer

When a differential amplifier is not perfectly symmetrical

Correct AnswerverifiedShow Answer

An amplifier that performs a mathematical operation is referred to as

Correct AnswerverifiedShow Answer

The input bias current of an op amp is defined as the sum of the dc base currents.

Correct AnswerverifiedShow Answer

A diff amp is sometimes called a long-tail pair because the two transistors share a common collector resistor.

Correct AnswerverifiedShow Answer

A differential amplifier output requires that the load is single-ended and has one end grounded.

Correct AnswerverifiedShow Answer

What can produce input error voltages when the two halves of the diff amp are not perfectly symmetrical?

Correct AnswerverifiedShow Answer

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