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Electronic Devices & CircuitsOperational Amplifiers

An ideal non-inverting op-amp is required to have a gain of 6. If R1 = 10 kOhm from the inverting input to ground, the feedback resistor Rf should be?

  • A10 kOhm
  • B40 kOhm
  • C50 kOhm
  • D60 kOhm
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Correct Answer: C. 50 kOhm
Explanation: For a non-inverting amplifier, Av = 1 + Rf/R1. Thus 6 = 1 + Rf/10 kOhm, giving Rf = 50 kOhm.
Reference: Standard op-amp design calculation
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