1. Introduction AD620 Instrumentation Amplifier

2. What is an Instrumentation Amplifier?
An instrumentation amplifier is a differential amplifier which meets certain industry standard requirements. They are :
Precise low level signal amplification
Low noise
Low thermal drift
High input resistance
Accurate closed loop gain and easier gain adjustment
Low power dissipation
High CMRR
High slew rate

3. What are the needs of Instrumentation amplifier?
In many industrial and consumer applications the measurement and control of quantities such as temperature, pressure and humidity etc are required.
A transducer converts these quantities into proportional electrical signal first
Output of the transducer is then applied to an amplifier called “Instrumentation amplifier”
The amplifier amplifies the low level output signal of the transducer to such a level that it can be drive the indicator or display

4. AD 620 IC Manufactured by Analog Devices company
Industry standard Low cost and high accuracy Instrumentation amplifier

5. Pin Diagram of AD620
Here, RG – External Gain setting Resistor

6. Block diagram of AD620

7. Features
Easy to use
Gain can be set with one external resistor(Gain range 1 to 10000)
Wide power supply range (0 to 18)
Higher performance
Low cost as compared to other instrumentation amplifiers
Low noise
Bandwidth is more
High common mode rejection ratio(about 100dB)
Available in 8 lead package
Low offset voltage
Low input bias current

8. Applications Pressure measurement Medical ECG
Precision V to I converter
And many more

9. OP 177 opamp IC
It is ultra high precision operational amplifier IC of any opamp currently available
Available in 8 pin DIP package

10. Pin diagram of OP177

11. Features of op177
Ultra low offset voltage (20 micro volt at room temp)
Excellent open loop gain
High CMRR (130dB)
Low supply current
Low noise
High slew rate and high bandwidth
Supply voltage (-22 to +22v)
Low power dissipation

12. Applications of op177 opamp
Thermocouple amplifiers
Precision high gain amplifiers
In bilateral current sources
Precision positive peak detectors
Precision threshold detector
Precision value amplifiers
Isolation of large capacitive loads