Operational Amplifiers – Complete Theory
Page 11 – Op-Amp Comparator
A Comparator is an operational amplifier circuit that compares two voltages and produces an output indicating which one is larger.
Basic Principle
- If Vin > Vref → Output goes to positive saturation
- If Vin < Vref → Output goes to negative saturation
Output Levels
Vout = +Vsat when Vin > Vref
Vout = -Vsat when Vin < Vref
Types of Comparators
- Non-inverting comparator
- Inverting comparator
- Zero-crossing detector
Zero Crossing Comparator
When reference voltage is zero:
Vref = 0
The circuit detects when the input signal crosses zero.Applications
- Analog to digital converters
- Level detection circuits
- Wave shaping circuits
- Signal detection systems
GATE Important Points
- Comparator operates in open-loop mode
- Output saturates at ±Vsat
- Very high gain of op-amp
- Used in zero-crossing detection
.png)
No comments:
Post a Comment