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GREEN UNIVERSITY OF BANGLADESH Department: EEE (Eve) Prepared By: Foyaz Ahmed ID# 143010007 Course Title: Electronics II Prepared For: Nusrat Alim Lecturer, GUB

OP AMP

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Page 1: OP AMP

GREEN UNIVERSITY OF BANGLADESH

Department: EEE (Eve)

Prepared By:

Foyaz AhmedID# 143010007

Course Title: Electronics IIPrepared For:

Nusrat AlimLecturer, GUB

Page 2: OP AMP

Basic of OP-AMP

Page 3: OP AMP

OPERATIONAL AMPLIFIER

An operational amplifier or OP AMP is a very high gain differential amplifier with high input impedance and low output impedance.

Page 4: OP AMP

A basic OP AMP has 2 input and 1 output

-

+ VO , OUTPUT

2

3

6

+ VCC

4

7

- VCC

INPUT

1

5

Page 5: OP AMP

OP-AMP LM741 IC Pin Assignment NULL OFFSET 1

INVERTING INPUT

NONINVERTING INPUT

- Vcc NULL OFFSET 2

Output

+Vcc

COMP1

2

3

4

8

7

6

5

LM 741 OP AMP IC PIN ASSIGNMENT

Page 6: OP AMP

Single ended Input operation results when the input signal is connected to one input and with the other input is connected to the ground.

SINGLE ENDED INPUT 

Page 7: OP AMP

-

+

VO

2

3

6

+ VCC

4

7

- VCC

Grounded

SINGLE ENDED INPUT 

Page 8: OP AMP

12 VVVd A double-ended input can be designed using a single input or using double inputs

DOUBLE ENDED INPUT 

Page 9: OP AMP

DOUBLE ENDED INPUT WITH

SINGLE INPUT

-

+

VO

2

3

6

+ VCC

4

7

- VCC

Vd

Single input

Page 10: OP AMP

DOUBLE ENDED INPUT WITH

DOUBLE INPUT

-

+

VO

2

3

6

+ VCC

4

7

- VCC

V2

V1

TWO INPUTS

Page 11: OP AMP

COMMON INPUT

When both input signals are the same, a common signal element due to the two inputs can be defined as the average of the sum of the two signals.

2121 VVVC

Page 12: OP AMP

OUTPUT VOLTAGE

The resulting output voltage of any op-amp can be defined as,

ccddO VAVAV

Where, Ad = Differential gain of the amplifier Ac = Common-mode gain of the amplifier

Page 13: OP AMP