GATE Electrical – Analog Electronics
Practice Problems – Page 16
This section contains problems based on Operational Amplifier Comparator and Schmitt Trigger circuits.
Problem 151
Question:
What is a comparator circuit?
Answer:
A comparator compares two voltages and produces a high or low output depending on which input voltage is larger.
Problem 152
Question:
What happens when Vin > Vref in a comparator?
Answer:
Output becomes positive saturation.
Problem 153
Question:
What happens when Vin < Vref?
Answer:
Output becomes negative saturation.
Problem 154
Question:
What is a Schmitt trigger?
Answer:
A Schmitt trigger is a comparator circuit with positive feedback that provides hysteresis.
Problem 155
Question:
What is hysteresis in Schmitt trigger?
Answer:
It is the difference between upper and lower threshold voltages.
Problem 156
Question:
Write the formula for hysteresis voltage.
Answer:
VH = VUT − VLT
Problem 157
Question:
Why is Schmitt trigger used?
Answer:
To eliminate noise and produce clean digital signals.
Problem 158
Question:
What is the output of a comparator if input is a sine wave?
Answer:
Square wave
Problem 159
Question:
Which op-amp application converts analog signals to digital signals?
Answer:
Comparator
Problem 160
Question:
What is the advantage of positive feedback in Schmitt trigger?
Answer:
It creates hysteresis which improves noise immunity.
.png)
No comments:
Post a Comment