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GREEN UNIVERSITY OF BANGLADESH
Department: EEE (Eve)
Prepared By:
Foyaz AhmedID# 143010007
Course Title: Electronics IIPrepared For:
Nusrat AlimLecturer, GUB
Basic of 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.
A basic OP AMP has 2 input and 1 output
-
+ VO , OUTPUT
2
3
6
+ VCC
4
7
- VCC
INPUT
1
5
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
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
-
+
VO
2
3
6
+ VCC
4
7
- VCC
Grounded
SINGLE ENDED INPUT
12 VVVd A double-ended input can be designed using a single input or using double inputs
DOUBLE ENDED INPUT
DOUBLE ENDED INPUT WITH
SINGLE INPUT
-
+
VO
2
3
6
+ VCC
4
7
- VCC
Vd
Single input
DOUBLE ENDED INPUT WITH
DOUBLE INPUT
-
+
VO
2
3
6
+ VCC
4
7
- VCC
V2
V1
TWO INPUTS
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
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