Difference between Schmitt Trigger and Comparator
Comparator | Schmitt Trigger |
---|---|
It is an op-amp circuit which comprises of two input signal. It produces high or low output based on input signal. | It is the comparator which implements hysteresis by using positive feedback. |
It uses open loop configuration of Op-Amp. It does not have any feedback loop. | It uses the positive feedback. |
The upper and lower threshold level are either defined at 0 volt or Vref (reference voltage which is known to the user). | It uses two threshold level, i.e. upper threshold level (VUT) and lower threshold level (VLT). |
Hysteresis is not present. The hysteresis voltage is zero. | Hysteresis is present. The value of hysteresis voltage is VH= VUT-VLT |
The external reference voltage (Vref) must be applied. | No external reference voltage need to be applied. |
It is used in zero crossing detector, window detector. | It is used to convert any waveform into the square waveform. |
Schmitt Trigger
We use Schmitt Triggers in digital electronics. It is used for rejecting the noise from the input signals by using the hysteresis curve. To provide accurate and more stable results, it uses two threshold voltages i.e., upper threshold voltage (VUT) and lower threshold voltage (VLT). It is mainly used in signal conditioning applications to remove noise from signals which is used in digital circuits, particularly mechanical contact bounce in switches. In this article, we will learn more about Schmitt Trigger, its working, and its applications.
Table of Content
- What is Schmitt Trigger?
- Working
- Transfer Characteristics
- Types
- Uses
- Schmitt Trigger Vs Comparator
- Advantages and Disadvantages
- Applications