Linear Integrated Circuits

4

Non-Linear Applications of Op Amp

Objectives

To learn the concepts for the use of operational amplifier in the following systems:

• Voltage comparator.
• Two applications of comparator as window detector and zero crossing detector.
• Schmitt trigger circuit with the extension of regenerative comparator.
• Multivibrator circuits.
• Precision rectifier or super diode with the combination of op amp as voltage follower and a diode.
• Extension of precision rectifiers for the use of peak detector circuits.

4.1 INTRODUCTION

1. Comparator circuits designed for ‘specific purpose’ or application work faster than op amps designed with general purpose applications. Input voltages to comparator circuits are analog signals and output is a digital or binary signal. ...