Zero crossing is the point of choice for measuring phase and frequency. The reference is usually easy to establish and the signal’s amplitude rate of change is maximum at signal zero. Phase synchronized triggering requires placing additional constraints on zero crossing detection. Weidenburg et. al. drop. II.
Towards the end of article, we have drawn another circuit diagram of zero crossing detector designed using IC 311 and transistor. The zero crossing detector circuit is an important application of the op-amp comparator circuit. It can also be called as the sine to square wave converter.
The net result is an accurate measurement at the expense of slow measurement rates. Zero crossing is the point of choice for measuring phase and frequency. The reference is usually easy to establish and the signal’s amplitude rate of change is maximum at signal zero.
The zero crossing detector circuit is an important application of the op-amp comparator circuit. It can also be called as the sine to square wave converter. Anyone of the inverting or non-inverting comparators can be used as a zero-crossing detector.
Thus zero crossing are detected for noise voltages in addition to the input voltage. These difficulties can be removed by using a regenerative feedback circuit with a positive feedback that causes the output voltage to change faster thereby eliminating the possibility of any false zero crossing due to noise voltages at the op-amp input.
D. Zero-Crossing Detection by Interpolation The implementation used in this design identifies two points on the sine wave: the first just before the positive going zero crossing and the second just after the same zero crossing.