Linear Integrated circuits: module 1

Module 1

Topics to be covered:

      •Introduction to op-amp

• Feedback & its type

• What do you mean by Virtual GND

• When Virtual GND is valid

• Linear applications

• Non-linear applications

• Need for op-amp

• Voltage Regulators

• Timers

• Phase locked loop

Op-amp µA741 Data sheet:
PIN Diagram:

Amplifier block diagram:

Fig. Internal Block diagram of an op-amp

Black Box model

Mathematical operations that can be performed using op-amp µA741:

Linear operation	Nonlinear operation
Addition (Summer)	Logarithm
Subtraction (Difference)	Anti-logarithm
Differentiation
Integration
Voltage follower/ buffer

Circuit diagram:

 Inverting Amplifier                              Non-Inverting Amplifier   

Inverting amplifier vs Non-Inverting amplifier

Advantages of Voltage follower circuit:

1.Input Impedance is High

2.Output  Impedance is Low

3.Large Bandwidth

4.Output follows Input without phase change

Other Op-amp configurations are:

  Ø Comparator

  Ø Instrumentation Amplifier

  Ø Schmitt Trigger

Comparator: is the circuit which compares 2 inputs V₁, V₂ and produces o/p as:
+V_SAT, 0, -V_SAT