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AIM The aim of this project is to design a Schmitt trigger that can reconstruct square waves from a blurred optical pulse train. BACKGROUND A Schmitt trigger is a circuit that generates a...

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AIM

The aim of this project is to design a Schmitt trigger that can reconstruct square waves from a blurred optical pulse train.

BACKGROUND

A Schmitt trigger is a circuit that generates a binary-valued(high/low) output signal in response to a continuous signal such that the output transition from low to high occurs at one value of the input signal, while the transition from high to low occurs at a lower input value. The Schmitt trigger therefore has a transfer function that folds back on itself, as shown in figure 1. Notice that over a range of input values, the output could be either high or low, depending on whether the input is returning from a high value or a low value. This characteristic is called hysteresis.

Answered Same DayOct 09, 2019

Solution

David answered on Nov 30 2019
68 Votes
As shown in the circuit diagram, a voltage divider with resistors Rdiv1 and Rdiv2 is set. The same values of Rdiv1 and Rdiv2 are used to get the resistance value Rpar = Rdiv1||Rdiv2 which is connected in series with the input voltage. Rpar is used to minimize the offset problems. The voltage across R1 is feedback to the non-inverting input. The input voltage Vi triggers or changes the state of output Vout every time it exceeds its voltage levels above a certain threshold value called Upper Threshold Voltage (Vupt) and Lower Threshold Voltage (Vlpt).
Let us assume that the inverting input voltage has a slight positive value. This will cause a negative value in the output. This negative voltage is feedback to the non-inverting terminal (+) of the op-amp through the voltage divider. Thus, the value of the negative voltage that is feedback to the positive terminal becomes higher. The value of the negative voltage becomes again higher until the circuit is driven into...
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