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ECE > Lecture 8 (Excluded) > Flashcards

Lecture 8 (Excluded) Flashcards

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1
Q

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

A

Operational Amplifiers

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2
Q

Ideal op-amp

A

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

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3
Q

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

A

input

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4
Q

Two inputs of op amps

A

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

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5
Q

Op amps could have ______ outputs.

A

one or two

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6
Q

Op amps typically use a _____ power supply.

A

positive and negative

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7
Q

It provides amplification between the difference of the two input voltages

A

Differential Amplifier (Input Stage)

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8
Q

It provides additional gain

A

Voltage Amplifier (Gain Stage)

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9
Q

It provides better power output

A

Push-Pull Amplifier (Output Stage)

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10
Q

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

A

operational

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11
Q

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

A

single-ended input

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12
Q

both input pins have
input signal.

A

double-ended input

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13
Q

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

A

Common mode rejection

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14
Q

The differential connection of op amps typically _____ noise significantly.

A

reduce

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15
Q

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

A

differential mode, common
mode

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16
Q

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

A

zero gain

17
Q

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

A

practical op-amps

17
Q

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

A

CMRR

18
Q

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

A

Open loop voltage gain

19
Q

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

A

Closed loop gain

20
Q

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

A

Offset voltage drift

21
Q

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

A

5μV to 50μV

22
Q

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

A

higher

23
Q

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

A

Input bias current.

24
Q

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.

A

Differential Input Impedance

25
Q

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.

A

Common-Mode Input Impedance

26
Q

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

A

Input offset current

27
Q

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

A

Output impedance

28
Q

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

A

Slew rate

29
Q

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

A

0Hz

30
Q

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

A

Negative feedback

31
Q

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

A

Negative feedback

32
Q

It is the voltage gain with external feedback circuit.

A

Closed-loop voltage gain

33
Q

It indicates how the voltage gain changes with frequency

A

Frequency response

34
Q

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

A

Phase response

ECE (13 decks)

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