Lecture 8 (Excluded)

Question 1

Very high gain amplifiers with very wide bandwidth, very
high input impedance (typically a few megaohms) and low output impedance (less than 100
ohms).

Answer 1

Operational Amplifiers

Question 2

Ideal op-amp

Answer 2

has infinite voltage gain, infinite input impedance, and zero output
impedance

Question 3

the ________ of an op amp is a differential amplifier, and it contains a number of amplifier stages to achieve a very high voltage gain.

Answer 3

input

Question 4

Two inputs of op amps

Answer 4

Non-inverting input (with + sign) and inverting input (with – sign)

Question 5

Op amps could have ______ outputs.

Answer 5

one or two

Question 6

Op amps typically use a _____ power supply.

Answer 6

positive and negative

Question 7

It provides amplification between the difference of the two input voltages

Answer 7

Differential Amplifier (Input Stage)

Question 8

It provides additional gain

Answer 8

Voltage Amplifier (Gain Stage)

Question 9

It provides better power output

Answer 9

Push-Pull Amplifier (Output Stage)

Question 10

The term _______ refers to its capabilities to perform mathematical operations (Add, subtract, differentiate and integrate) as its main applications

Answer 10

operational

Question 11

An input of op amps wherein one input is connected to the ground.

Answer 11

single-ended input

Question 12

both input pins have
input signal.

Answer 12

double-ended input

Question 13

It is the ability of an op amp to reject the common signals at its inputs.

Answer 13

Common mode rejection

Question 14

The differential connection of op amps typically _____ noise significantly.

Answer 14

reduce

Question 15

Desired signals can appear on only in __________ while unwanted signal appear in ____________

Answer 15

differential mode, common
mode

Question 16

An op-amp provides a very high gain for differential-mode signals and _______ for common-mode signals.

Answer 16

zero gain

Question 17

It exhibit a very small gain (less than 1), while providing a high open-loop differential voltage gain (several thousands).

Answer 17

practical op-amps

Question 17

The good measure of an op-amp’s performance in rejecting unwanted common-mode signals is thru _______.

Answer 17

CMRR

Question 18

It is an op amp specification which indicates the voltage gain of an op amp when there is no feedback resistor.

Answer 18

Open loop voltage gain

Question 19

The gain of the op amp circuit when there is a feedback resistor.

Answer 19

Closed loop gain

Question 20

It is defined as how much current change occurs in the input offset voltage for each degree change in temperature.

Answer 20

Offset voltage drift

Question 21

The typical value of the voltage drift is in the range of ______ per
degree Celsius.

Answer 21

5μV to 50μV

Question 22

Op-amps with a higher nominal value of input offset voltage exhibits a ________ drift.

Answer 22

higher

Question 23

The dc current required by the input of the amplifier to properly operate the first stage of an op-amp

Answer 23

Input bias current.

Question 24

Total resistance between inverting and non inverting input as. It can be measured by determining the change in bias current for a given change in differential input voltage.

Answer 24

Differential Input Impedance

Question 25

The total resistance between each input terminal and ground It can be measured by determining the change in bias current for a given change in common-mode input voltage.

Answer 25

Common-Mode Input Impedance

Question 26

It is the absolute value of the difference of the input bias currents

Answer 26

Input offset current

Question 27

It is measured across the output terminal of the op-amp.

Answer 27

Output impedance

Question 28

It is defined as the maximum rate of change of the output voltage in a step input voltage. It is dependent upon the high-frequency response of the amplifier stages within the op-amp

Answer 28

Slew rate

Question 29

Since op-amp doesn’t have coupling capacitors, its low frequency response extends down to _____ (dc).

Answer 29

0Hz

Question 30

It is the process of returning the output voltage of amplifier to the input with a phase angle that opposes the input signal.

Answer 30

Negative feedback

Question 31

It also provide stable voltage gain, and control of the input and output impedances and amplifier bandwidth.

Answer 31

Negative feedback

Question 32

It is the voltage gain with external feedback circuit.

Answer 32

Closed-loop voltage gain

Question 33

It indicates how the voltage gain changes with frequency

Answer 33

Frequency response

Question 34

It indicates how the phase shift between the input and output signal changes with frequency.

Answer 34

Phase response