## What is the zero cross detector?

A zero-crossing is a point where the sign of a mathematical function changes (e.g. from positive to negative), represented by a crossing of the axis (zero value) in the graph of the function.

### Why do we use zero-crossing detector?

Zero crossing detectors widely find applications in electronics circuits mainly for switching purpose and in phase locked loop. Also, these are used in frequency counters and in phase meters. It can also be used as phase meters, as it can be used to measure the phase angle between two voltage applied at its terminals.

**What is the drawback in zero crossing detectors?**

What is the drawback in zero crossing detectors? Explanation: Due to low frequency signal, the output voltage may not switch quickly from one saturation voltage to other. The presence of noise can fluctuate the output between two saturation voltages.

**How can a Schmitt trigger acting as a zero crossing detector?**

Schmitt Trigger Circuit A Zero Crossing detector circuit with a feedback connection, usually positive, constitutes the Schmitt trigger. The Schmitt trigger circuit has definite predefined upper and lower input voltage levels that trigger the output to switch from one saturation level to the other.

## What is the disadvantage of zero-crossing detector?

### What is the value of reference voltage in zero-crossing detector circuit?

= 0V

Anyone of the inverting or non-inverting comparators can be used as a zero-crossing detector. The only change to be brought in is the reference voltage with which the input voltage is to be compared, must be made zero (Vref = 0V).

**What is zero-crossing in image processing?**

A zero-crossing is a point where the sign of a mathematical function changes (e.g. from positive to negative), represented by an intercept of the axis (zero value) in the graph of the function. It is a commonly used term in electronics, mathematics, acoustics, and image processing.