For which of the following functions can a Schmitt trigger be used? 

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RRB ALP CBT 2 Electronic Mechanic Previous Paper: Held on 23 Jan 2019 Shift 1
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  1. Pulse shaping
  2. Blocking
  3. Amplification
  4. Filtering

Answer (Detailed Solution Below)

Option 1 : Pulse shaping
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Detailed Solution

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Schmitt trigger:

  • Schmitt trigger is a comparator circuit with hysteresis implemented by applying positive feedback to the noninverting input of a comparator or differential amplifier.
  • In the non-inverting configuration, when the input is higher than a chosen threshold, the output is high.
  • When the input is below a different (lower) chosen threshold the output is low, and when the input is between the two levels the output retains its value.
  • if we use the Schmitt Trigger for the noisy input signal we will get a correct input of two pulses because of the two different thresholds.
  • The main function of the Schmitt Trigger is to convert noisy square waves, sine waves, or slow edges inputs into s. 

 

​Comparison of the action of an ordinary comparator (a) (one threshold) and a Schmitt trigger (b) on a noisy analog input signal is shown in the figure:

F2 Neha Madhu 29.10.20 D5

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