OP AMP

Question 1

It is an electronic circuit or device which increases the amplitude of a signal

Answer 1

Amplifier

Question 2

waveform is _______, signal is ___________

Answer 2

same, stronger

Question 3

was designed to
perform such mathematical operations as
addition, subtraction, integration and
differentiation.

Answer 3

OPERATIONAL AMPLIFIER (OPAMP)

Question 4

op amp was originally invented in early 1940s using ___________ technology

Answer 4

vacuum tube

Question 5

op amp: Initial purpose was to execute math operations in
_________ electronic calculating machines

Answer 5

analog

Question 6

op amp: ________ in size with the invention of the _____________

Answer 6

Shrunk, transistor

Question 7

op amp: Most now made on ___________________

Answer 7

integrated circuit (IC)

Question 8

Huge variety of applications, low cost, and ease of mass
production make them extremely popular

Answer 8

op amp

Question 9

Fairchild Semiconductors

Answer 9

• µA 702 (1963)
• µA 709 (1965)
• µA 741 (1968)
• µA 748 (1968)

Question 10

National Semiconductors

Answer 10

• LM101 (1967)
• LM101A (1968)
• LM107 (1968)
• LM324 (1974)

Question 11

OP AMP – A MULTISTAGE AMPLIFIER (3)

Answer 11

1) Differential Amplifier stage
2) High gain CE amplifier stage
3) Class B push pull emitter follower

Question 12

Ideal Op Amp

Answer 12

Zin = ∞
Zout = 0
AVOL = ∞
BW = ∞

Question 13

Practical Op Amp

Answer 13

Zin = 2MΩ
Zout = 100Ω
AVOL = 10^5
BW = GHz

Question 14

This works
because the capacitor needs time to charge.

Answer 14

Cutoff frequency

Question 15

An example of high-pass active filter. The __________ amplifier, is used as a __________ amplifier.

Answer 15

operational, buffer

Question 16

Need to measure difference in voltage from lead 1
and lead 2
– 60 Hz interference from electrical equipment

Answer 16

Electrocardiogram (ECG) Amplification

Question 17

Uses differential amplifier
to cancel common mode
signal and amplify
differential mode signal

Answer 17

Simple ECG circuit

Question 18

Uses two non-inverting
amplifiers to first amplify
voltage from each lead,
followed by differential
amplifier

Answer 18

Realistic ECG circuit

Question 19

Forms an “instrumentation
amplifier”

Answer 19

Realistic ECG circuit

Question 20

Use a Wheatstone bridge to determine the strain of an element by measuring the change in resistance of a strain gauge

Answer 20

Strain Gauge

Question 21

(1) ____________
R #1 = R #2
(2) ____________
R #1 ≠ R #2

Answer 21

1) (No strain) Balanced Bridge
2) (Strain) Unbalanced Bridge

Question 22

Op amp used to _________ output from strain gauge

Answer 22

amplify

Question 23

Speakers and microphone circuits in cell phones, computers, mpg players, boom boxes, etc.

Answer 23

Audio amplifiers

Question 24

Biomedical systems including heart monitors and oxygen sensors.

Answer 24

Instrumentation amplifiers

Question 25

Power amplifiers

Answer 25

Op Amps Applications

Question 26

Combination of integrators, differentiators, summing amplifiers, and multipliers

Answer 26

Analog computers