GATE EC 2017 Set 1 — Question 12
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Analog Circuits → Op-Amp Circuits → Schmitt Trigger & Comparators
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Question
For the operational amplifier circuit shown, the output saturation voltages are . The upper and lower threshold voltages for the circuit are, respectively,
Correct answer
(B) +7 V and -3 V
Solution
The given circuit is an inverting Schmitt trigger with a non-zero reference voltage.
Output saturation voltages are .
Reference voltage .
Feedback resistors are and .1. Upper Threshold Voltage ():
When the output is at (i.e., ), the voltage at the non-inverting input () is determined by the voltage divider formed by , , , and .Substitute :2. Lower Threshold Voltage ():
When the output is at (i.e., ), the voltage at the non-inverting input () is:Substitute :Thus, the upper threshold voltage is and the lower threshold voltage is .Therefore, the correct option is (B).
Output saturation voltages are .
Reference voltage .
Feedback resistors are and .1. Upper Threshold Voltage ():
When the output is at (i.e., ), the voltage at the non-inverting input () is determined by the voltage divider formed by , , , and .Substitute :2. Lower Threshold Voltage ():
When the output is at (i.e., ), the voltage at the non-inverting input () is:Substitute :Thus, the upper threshold voltage is and the lower threshold voltage is .Therefore, the correct option is (B).
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