Download Operational amplifier - Erode Sengunthar Engineering College

Operational amplifier
PREPARED BY
V.Thamizharasan,AP/ECE
Erode Sengunthar Engineering College
Basic information of op-amp
Op-amp is a direct coupled high gain amplifier
Used to amplify dc and ac input signals
To perform mathematical operation
It can be used as active filters, amplifiers, oscillators,
comparators, regulators and etc.
Symbol of op-amp:
Non inverting input terminal
Inverting input terminal
Output
terminal
Packages
Metal can (TO) package
The dual in line package(DIP)
Flat package or flat pack
Cont.,
dual in line plastic
package
ceramic flat package
Dual in line welded seal ceramic package
To-5 style package with
straight leads.
Power supply connection
Manufacturers for linear ICs
741 versions
Equivalent circuit of op-amp
Ideal/Practical characteristics of op-amp
Features of op-amp 741
•No external frequency compensation(internally frequency
compensated)
•Short circuit protection
•Offset-null capability
•Large common mode and differential mode voltage range
three different packages
•Available various operating temperature ranges
•Low power consumption
•No latch up problem
General operational amplifier stages
1 & 2 stages provide high gain and high input resistance
3buffer and level shifter provide high input impedance and adjust d.c
voltage.
4provide low output impedance
Basic differential amplifier
Suppress any undesired noise signal
CMRRbetter for high
4 different configuration
1.Differential input and differential output (or)
Dual innput and balanced output
2.Differential input and signle ended output
3.Sigle input ,differential output
4.Single input single ended output.
Mode of operation:
1.Common mode operation
2.Differential mode operation
Cont.,
Cont.,
Differential input signal applied
Improvement of CMRR
Internal circuit diagram of UA 741 op-amp
Motorola MC1530 op-amp