Question: An OPAMP having an open loop gain is designed with a loop gain (A<sub>vol</sub> β) where β = R<sub>1</sub>/(R<sub>1</sub>+ R<sub>f</sub> ) with R<sub>1</sub> = resistance connected to non-inverting end and R<sub>f</sub> = resistance connected in the feedback path, the input resistance of the amplifier (R<sub>inf</sub>) with feedback is :
Answer:
MCQ: An OPAMP having an open loop gain is designed with a loop gain (A<sub>vol</sub> β) where β = R<sub>1</sub>/(R<sub>1</sub>+ R<sub>f</sub> ) with R<sub>1</sub> = resistance connected to non-inverting end and R<sub>f</sub> = resistance connected in the feedback path, the input resistance of the amplifier (R<sub>inf</sub>) with feedback is :
Correct Answer:
A. R<sub>inf</sub> = R<sub>in</sub> (1+ A<sub>vol</sub> β)
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Related Questions
- 1. An OPAMP having an open loop gain is designed with a loop gain (A<sub>vol</sub> β) where β = R<sub>1</sub>/(R<sub>1</sub>+ R<sub>f</sub> ) with R<sub>1</sub> = resistance connected to non-inverting end and R<sub>f</sub> = resistance connected in the feedback path, the output resistance of the amplifier (R<sub>of</sub>) with feedback is :
- 2. Offset voltages in OPAMP are produced because of :
- 3. The typical value of input offset voltage of a 741 OPAMP is :
- 4. The typical value of input offset Current of a 741 OPAMP is :
- 5. A 741 OPAMP has,
- 6. A 741 OPAMP has a open loop gain 200,000. The input offset voltage is 2 mV. If the input terminals are shorted , the output voltage is :
- 7. In order to eliminate the output voltage on account of input offset voltage,
- 8. An active half wave voltage follower circuit has an input of 10 sinωt V. The input resistance has value 2 kΩ and feedback resistance is 10 kΩ. The expression for input voltage is :
- 9. The output of an OPAMP is 2 V peak. The slew rate is 5 V / µ. The input sinusoidal which can be reproduced with no distortion has the maximum frequency of :
- 10. A differential amplifier has + 100 mV applied to non inverting end and + 250 mV applied to inverting end. The output is 1.5 V. the gain of the amplifier is :
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