Question 1

Data sheets generally specify common-mode rejection ratio in ________.

Accepted Answer

A)  mhos 
B)  volts 
C)  decibels 
D)  joules 
A)  mhos 
B)  volts 
C)  decibels 
D)  joules C

Question 2

The + symbol when used with an input of an op amp represents

Accepted Answer

A)  the inverting input. 
B)  the noninverting input. 
C)  the differential input. 
D)  the single-ended input. 
A)  the inverting input. 
B)  the noninverting input. 
C)  the differential input. 
D)  the single-ended input. B

Question 3

Integrated circuits with fewer than 12 integrated components are referred to as

Accepted Answer

A)  small-scale integration. 
B)  medium-scale integration. 
C)  large-scale integration. 
D)  very large scale integration. 
A)  small-scale integration. 
B)  medium-scale integration. 
C)  large-scale integration. 
D)  very large scale integration. A

Question 4

The input circuit used in most op amps is the common-collector amplifier.

Accepted Answer

A) True 
 B)False

Question 5

Components that are easily fabricated on a chip do not include ________.

Accepted Answer

A)  transistors 
B)  capacitors 
C)  diodes 
D)  resistors 
A)  transistors 
B)  capacitors 
C)  diodes 
D)  resistors

Question 6

The input offset voltage is defined as the input voltage that would produce the same output error voltage in a perfect diff amp.

Accepted Answer

A) True 
 B)False

Question 7

With diff amp configurations,when a single-ended output is used,the input may be noninverting or inverting.

Accepted Answer

A) True 
 B)False

Question 8

The input impedance of a diff amp is

Accepted Answer

A)  half as high as a single common-emitter stage. 
B)  twice as high as a single common-emitter stage. 
C)  the same as a single common-emitter stage. 
D)  four times as high as a single common-emitter stage. 
A)  half as high as a single common-emitter stage. 
B)  twice as high as a single common-emitter stage. 
C)  the same as a single common-emitter stage. 
D)  four times as high as a single common-emitter stage.

Question 9

The term operational amplifier refers to an amplifier that performs a mathematical operation.

Accepted Answer

A) True 
 B)False

Question 10

Data sheet characteristics that designers use for accurate answers do not include

Accepted Answer

A)  input bias current. 
B)  input offset current. 
C)  input offset resistance. 
D)  input offset voltage. 
A)  input bias current. 
B)  input offset current. 
C)  input offset resistance. 
D)  input offset voltage.

Question 11

The input offset current is defined as the difference of the dc base currents.

Accepted Answer

A) True 
 B)False

Question 12

If compensation of an op amp becomes necessary,the best approach is to use

Accepted Answer

A)  nulling circuits. 
B)  filtering circuits. 
C)  squelching circuits. 
D)  regulating circuits. 
A)  nulling circuits. 
B)  filtering circuits. 
C)  squelching circuits. 
D)  regulating circuits.

Question 13

What are typically used as current sources and active loads in the design of IC op amps?

Accepted Answer

A)  current limiters 
B)  zener regulators 
C)  current mirrors 
D)  current amps 
A)  current limiters 
B)  zener regulators 
C)  current mirrors 
D)  current amps

Question 14

What is the common-mode voltage gain for the circuit shown in Figure 15-21?

Accepted Answer

A)  1 
B)  0.5 
C)  1.5 
D)  2 
A)  1 
B)  0.5 
C)  1.5 
D)  2

Question 15

In order to get single-ended input operation using a diff amp,one of the inputs is used and the other input is grounded.

Accepted Answer

A) True 
 B)False

Question 16

When a diff amp is amplifying the wanted signal and discriminating against the common-mode signal the CMRR is

Accepted Answer

A)  high. 
B)  low. 
C)  less than 1. 
D)  equal to the common-mode voltage gain divided by the voltage gain. 
A)  high. 
B)  low. 
C)  less than 1. 
D)  equal to the common-mode voltage gain divided by the voltage gain.

Question 17

Ultra large scale integration refers to placing approximately how many components on a single chip?

Accepted Answer

A)  12 to 100 
B)  more than 100 
C)  thousands 
D)  more than a million 
A)  12 to 100 
B)  more than 100 
C)  thousands 
D)  more than a million

Question 18

When the noninverting and inverting input voltages of a differential amp are present,the output voltage equals the voltage gain times the difference of the two input voltages.

Accepted Answer

A) True 
 B)False

Question 19

Which diff amp configuration produces the maximum voltage gain?

Accepted Answer

A)  differential input with differential output 
B)  differential input with single-ended output 
C)  single-ended input with differential output 
D)  single-ended input with single-ended output 
A)  differential input with differential output 
B)  differential input with single-ended output 
C)  single-ended input with differential output 
D)  single-ended input with single-ended output

Question 20

In an op amp,the average of the dc base currents is referred to as

Accepted Answer

A)  input offset current. 
B)  input bias current. 
C)  input average current. 
D)  base average current. 
A)  input offset current. 
B)  input bias current. 
C)  input average current. 
D)  base average current.

Exam 15: Differential Amplifiers

Data sheets generally specify common-mode rejection ratio in ________.

The + symbol when used with an input of an op amp represents

Integrated circuits with fewer than 12 integrated components are referred to as

The input circuit used in most op amps is the common-collector amplifier.

Components that are easily fabricated on a chip do not include ________.

The input offset voltage is defined as the input voltage that would produce the same output error voltage in a perfect diff amp.

With diff amp configurations,when a single-ended output is used,the input may be noninverting or inverting.

The input impedance of a diff amp is

The term operational amplifier refers to an amplifier that performs a mathematical operation.

Data sheet characteristics that designers use for accurate answers do not include

The input offset current is defined as the difference of the dc base currents.

If compensation of an op amp becomes necessary,the best approach is to use

What are typically used as current sources and active loads in the design of IC op amps?

What is the common-mode voltage gain for the circuit shown in Figure 15-21?

In order to get single-ended input operation using a diff amp,one of the inputs is used and the other input is grounded.

When a diff amp is amplifying the wanted signal and discriminating against the common-mode signal the CMRR is

Ultra large scale integration refers to placing approximately how many components on a single chip?

When the noninverting and inverting input voltages of a differential amp are present,the output voltage equals the voltage gain times the difference of the two input voltages.

Which diff amp configuration produces the maximum voltage gain?

In an op amp,the average of the dc base currents is referred to as

Introduction

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Basic BJT Amplifiers

Multistage,CC,and CB Amplifiers

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