Question
What absolute voltage gain can be expected from the circuit in Figure E7-3 when R1 is 3,300 ohms and RF is 47 kilohms?
Answer Options
- A) 28
- B) 14
- C) 7
- D) 0.07
Correct Answer: B
Explanation
The voltage gain of the inverting op-amp circuit in Figure E7-3 is calculated by taking the ratio of the feedback resistor (R_F) to the input resistor (R_1). This ratio sets the magnitude of the amplification that the circuit provides to the input signal.
R_1 = 3,300 \Omega and R_F = 47 \text{ k}\Omega = 47,000 \Omega. The absolute voltage gain is |A_V| = R_F / R_1 = 47,000 \Omega / 3,300 \Omega \approx \mathbf{14.24}. Rounding to the nearest integer, the expected absolute gain is 14. The circuit amplifies the input voltage by a factor of 14 and inverts the phase.
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