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CPE112 > Amplifiers > Flashcards

Amplifiers Flashcards

1
Q

Used to increase the amplitude of a signal waveform, without changing other parameters of the waveform

A

Amplifier

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2
Q

What are the parameters of the waveform that is not changed by the amplifier?

A

Frequency or wave shape

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3
Q

Small Signal -> Common Emitter -> ? -> ?

A

Class A Amplifier; Direct Current (DC)

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4
Q

Large Signal -> Common Base -> ? -> ?

A

Class B Amplifier; Audio Frequencies (AF)

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5
Q

Common Collector -> ? -> ?

A

Class AB Amplifier; Radio Frequencies (RF)

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6
Q

Class C Amplifier -> ?

A

VHF, UHF, and SHF Frequencies

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7
Q

Linear devices that have all the properties required for nearly ideal DC amplication

A

Operational Amplifiers (op amps)

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8
Q

Op amps is used extensive in s_ c_ f_ or to p_ m_ o_

A

signal conditioning; filtering; perfom mathematical operations

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9
Q

What are the mathematical operations that op amps can do?

A

Add, Subtract, Integration, Differentiation

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10
Q

In Op Amps, V1 represents?
Hint: I_ I_ or I_ A_

A

Inverting Input
Inverting Amplifier

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11
Q

In Op Amps, V2 represents?
Hint: N_-I_ I_ or N_-I_ A_

A

Non-inverting input
Non-inverting Amplifier

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12
Q

DVPS

A

Dual Voltage Power Supply

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13
Q

Very _ input impedance but very _ impedance on the output voltage

A

high; low

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14
Q

Vout =

A

Aol(V2-V1)

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15
Q

Aol refers to

A

Open loop gain

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16
Q

Importance of Op Amps to Analog Electonics

They make use of n_ f_ easy and straightforward and confer on any circuit where they are used.

A

Negative feedback

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17
Q

Importance of Op Amps to Analog Electonics

Op amps are still a p_ b_ b_ for analog systems, performing tasks like a_, a_ f_, and s_ t_.

A

primary building block; amplification; active filtering; signal transformation

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18
Q

The return of a portion of the output signal to the input signal (out-of-phase)

A

Negative feedback

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19
Q

If op amp has feedback, its operation is

A

Closed loop

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20
Q

If op amp is with no feedback, the operation is

A

Open loop

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21
Q

Formula for Output Voltage in Op Amps

A

Vo = Av (V+ - V-)

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22
Q

Op amps have two inputs, what is it?

A

Noninverting and inverting input

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23
Q

Input whose voltage is designated V+

A

Noninverting input

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24
Q

Input designated V-

A

Inverting

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25
Q

Most op amps have a s_ o_ lead, which carries the output voltage V_

A

Single output, Vo

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26
Q

Most op amp require d_ DC power supplies, designated _ and _

A

Dual; +Vs; -Vs

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27
Q

The ideal op amp’s input terminal draw no c_ from the source voltages connected to them. This means that the ideal op amp has i_ i_ i_

A

current; infinite input impedance

28
Q

4 basic building blocks of an op amp
B, 2, G, B

A

Bias Section
2:1 Section
Gain Section
Buffer Stage

29
Q

Under bias section:
Provide constant voltage into small circuits but it must be maintained.

A

Bandgaps

30
Q

Under bias section:
Provide constant current into small circuits but it must be maintained.

A

Current mirrors

31
Q

Under 2:1 Section:
There are _ inputs and _ output on an op amp

A

Two; one

32
Q

Under 2:1 Section:
This stage is somewhere on the i_

A

Inside

33
Q

Under 2:1 Section:
Two transistors hooked to a common current source

A

Differential Pair

34
Q

Under Gain Section:
= I_ section
= _ is bigger than the _
= Smallest difference in the _ voltages can cause issues on _

A

Important
Output; Input
Input; Output

35
Q

Under buffer stage:
= protects _ circuit
= drives the _
= _ voltage and the _ voltage are equal
= provides more _ which makes into more _

A

Gain
Load
Input; Output
Current; Power

36
Q

Assume that input terminals have infinite impedance and draw no current. The summing junction have V =0

HINT:
IA and NA

A

Inverting Amplifier
Non-inverting Amplifier

37
Q

Vary the resistances to set the negative gain

A

Inverting Amplifier

38
Q

Vary the resistances to set the positive gain

A

Non inverting Amplifier

39
Q

X

A

Virtual Earth Summing Point

40
Q

Assume that input terminals have infinite impedance and draw no current. Use superposition to calculate Vout from V1, V2, and V3. Then sum the output voltages to find total output

A

Summing Amplifier

41
Q

Applies external voltage to both inputs, making it useful for amplifying sensor signals. The principle of superposition is used again here.

A

Differential Amplifier

42
Q

The output of the differential amplifier is d_ p_ to the difference of the two external V1 and V2, where gain is given by R3 divided by R1

A

Directly propotional

43
Q

A form of differential amplifier where the inputs are buffered by two op amps

A

Instrumentation Amplifier

44
Q

Increases the disparity among two inputs
One kind of IC or integrated circuit

A

Instrumentation Amplifier

45
Q

Instrumentation Amplifier is designed specifically for sensor inputs with its
* variable h_ g_
* high i_ i_
* low i_ o_ d_
* high c_ m_ r_

A

High gain
Input impedance
Input offset drift
Common mode rejection

46
Q

Used to amplify small differential signals for thermocouples, strain gauges, current sensors used in motor controls

A

Instrumentation Amplifier

47
Q

The _ are specifically set up for amplifying sensor signals

A

Pinouts

48
Q

The op-amps 1&2 are n_ and op-amps 3 is a d_ a_. These what form an instrumentation amplifier

A

Non-inverting; difference amplifier

49
Q

Advantages of Instrumentation Amplifier:

The gain of a three op-amp instrumentation amplifier circuit can be easily varied by adjusting the value of only _ resistor: _

A

One; Rgain

50
Q

Advantages of Instrumentation Amplifier:

The gain of the amplifier depends only on the e_ r_ used

A

External resistors

51
Q

Advantages of Instrumentation Amplifier:

The i_ i_ is very h_ due to the e_ follower configurations of amplifiers 1 and 2

A

Input impedance; high; emitter

52
Q

Advantages of Instrumentation Amplifier:

The o_ i_ of the instrumentation amplifier is very l_ due to the difference amplifier 3

A

Output impedance: low

53
Q

Advantages of Instrumentation Amplifier:

The _ of the op-amp 3 is very high and almost all of the common mode signal will be rejected.

A

CMRR

54
Q

Applications of Instrumentation Amplifier:

These amplifiers mainly involve where the accuracy of h_ d_ g_ is required, s_ must be preserved in n_ surroundings, as well as where huge c_-m_ signals are there

A

High differential gain
Strength; noisy surroundings
Common-mode

55
Q

Applications of Instrumentation Amplifier:

Instrumentation amplifiers are used in d_ a_ from small o/p t_

A

Data acquisition; transducers

56
Q

Small o/p transducers are:
hint: t, s g, m of w b

A

Thermocouples
Strain gauges
Measurements of Wheatstone bridge

57
Q

Applications of Instrumentation Amplifier:

These amplifiers are used in n, m, r etc

A

Navigation, medical, radar

58
Q

Applications of Instrumentation Amplifier:

These amplifiers are used to enhance the / ratio in audio applications like audio signals with low amplitude

A

S/N (signal to noise)

59
Q

Applications of Instrumentation Amplifier:

These amplifiers are used for i_ as well as v_ d_ a_ in the conditioning of high-speed signal

A

Imaging
Video data acquisition

60
Q

Applications of Instrumentation Amplifier:

These amplifiers are used in _ cable systems for amplication of the high-frequency signal

A

Radio Frequencies (RF)

61
Q

Difference Between Op Amp and Instrumentation Amp:

A/n _ is one-kind of an IC

A

Operational Amplifier

62
Q

IC means

A

Integrated circuit

63
Q

Difference Between Op Amp and Instrumentation Amp:

The _ amplifier is one type of differential amplifier

A

Instrumentation

64
Q

Difference Between Op Amp and Instrumentation Amp:

_ amplifier can be built with three operational amplifier

A

Instrumentation

65
Q

Difference Between Op Amp and Instrumentation Amp:

The _ amplifier can be built with a single operational amplifier

A

Differential

66
Q

Difference Between Op Amp and Instrumentation Amp:

The o_ v_ of difference amplifier gets affected because of the m_ r_

A

Output voltage; mismatch resistors

67
Q

Difference Between Op Amp and Instrumentation Amp:

_ amplifier offers gains with a single resistor of its primary phase which does not need a resistor matching

A

Instrumentation

CPE112 (4 decks)

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