Zero Crossing Detector (Non Inverting)


A zero crossing detector or ZCD is a one type of voltage comparator, used to detect a sine waveform transition from positive and negative, that coincides when the input crosses the zero voltage condition

Zero Crossing Detector using 741-Opamp

Working of zero crossing detector (Non-Inv) circuit

  • Working of ZCD can be easily understood if you know the working of a basic Inverting opamp comparator.
  • The negative terminal is grounded.
  • The output is driven into +Vsat when the input signal passes through zero to positive direction.
  • Conversely, when input signal passes through zero to negative direction, the output switches to -Vsat.


the output of Inverting ZCD

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Zero Crossing Detector (Inverting)

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A  zero crossing detector  or ZCD is one type of voltage comparator, used to detect a sine waveform transition from positive and negative, that coincides when the i/p crosses the  zero  voltage condition.In the following section we will be looking into Inverting ZCD. Working of zero crossing detector (Inv) circuit Working of ZCD can be easily understood if you know the working of a basic Inverting opamp comparator. The positive terminal is grounded. The output is driven into –Vsat when the input signal passes through zero to positive direction. Conversely, when input signal passes through zero to negative direction, the output switches to +Vsat. Output of ZCD(Inv)
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