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Schmitt Trigger

When a noise voltage signal exists in the input voltage, the comparator output signal will be square wave with some unwanted signals. The comparator output state changes either from +V
sat to –Vsat or from –Vsat to +Vsat when, there is some millivolt change in the input voltage which is above the reference voltage or less than reference voltage. As noise signal is generated at random value, the output consists of a series of pulses of different width as shown in Fig. This phenomenon is called chattering. This problem can be removed by a Schmitt trigger circuit.

 Schmitt trigger circuit


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