Presented by:

Anamika

OPERATIONAL AMPLIFIER

1. INTRODUCTION 2. AMPLIFIER 3.WHAT IS OP AMP 4. CIRCUIT SYMBOL 5.OP-AMP PICTURES 6.PIN DIAGRAM 7. BLOCK DIAGRAM 8. IMPORTANT TERMS AND EQUATIONS 9. IDEAL OP AMP 10. VOLTAGE TRASFER CHARACTERSTICS 11. APPLICATIONS 12. ADVANTAGES AND DISADVANTAGES 13.CONCLUSION

TOUR GUIDE

INTRODUCTIONThe term “operational amplifier” denotes a special type of amplifier of amplifier that, by proper selection of its externalcomponents, could be configured for a variety of operations.

HISTORY First developed by John R. Ragazzine in 1947In 1960 at FAIRCHILD SEMICONDUCTOR CORPORATION, Robert Widlor fabricated op-amp with the help of IC fabrication technology.In 1968 FAIRCHILD introduces the op-amp that was to become the industry standard.

AMPLIFIER

Virtual Ground

WHAT IS OP-AMP 1) DC-coupled high gain amplifier

2) Output voltage is proportional to the difference of two input voltage

3) It performs arithmetic operation

CIRCUIT SYMBOL

Op-amp pictures

IC- 627

IC-741

OP-AMP PIN DIAGRAM

FIG: IC-741

PIN 1: Offset Null

PIN 2: Inverting input terminal

Pin 3: Non-Inverting input terminal

Pin 4: -VCC

Pin 5: Offset Null

Pin 6: Output

Pin 7: +VCC

Pin 8: NC (no connection)

BLOCK DIAGRAM OF OP-AMP

INPUT STAGE

INTERMEDIATESTAGE

LEVELSHIFTINGCIRCUIT

OUTPUT STAGE

Non-InvertingI/P

InvertingI/P

OUTPUT

Input Stage

Intermediate Stage

Level Transistor/ Shifting Stage

Output Stage

Important terms & equation

IDEAL OP-AMPIdeal OP-AMP characters

1) Infinite input impedance2) Zero output impedance3) Infinite bandwidth4) Infinite open-loop gain5) Infinite CMRR

VOLTAGE TRANSFER CHARACTERISTICS

applications1. ADDER

2. SUBTRACTOR

Vout=(V2-V1) ; If R1=R2=R3=R4

3. DIFFERENTIATOR

4. INTGRETER

MORE APPLICATIONS

Voltage Follower

Comparator

ADVANTAGES & DISADVANTAGES

ADVANTAGES

1) It has high reliability ,2) Small in size, 3) Cheap in cost,4) Low power consumption, 5) It can performs arithmetic

operation,6) It can be used as filter, oscillator etc.

DISADVANTAGES

1) Designed for lower power operation,

2) Shuts off when the load resistance is below a certain level etc.

CONCLUSION Op-Amps are often used for

Sensor amplification Mathematical operations (sums, difference, inverse) Filters (High/Low/Band pass) Measurement devices

Current in –> Voltage out