1. What is Op-Amp Gain?

Op-amp gain refers to the amplification factor of an operational amplifier circuit. In the inverting configuration, the gain determines how much the input signal is amplified and inverted at the output.

2. How Does the Calculator Work?

The calculator uses the inverting op-amp gain formula:

Where:

• \( A_v \) — Voltage gain (unitless)
• \( R_f \) — Feedback resistance (Ω)
• \( R_{in} \) — Input resistance (Ω)

Explanation: The negative sign indicates signal inversion, and the ratio of feedback to input resistance determines the amplification magnitude.

3. Importance of Op-Amp Gain Calculation

Details: Accurate gain calculation is essential for designing amplifier circuits, signal processing systems, and ensuring proper circuit performance in electronic applications.

4. Using the Calculator

Tips: Enter feedback resistance and input resistance in ohms (Ω). Both values must be positive and non-zero for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: Why is the gain negative in inverting configuration?
A: The negative sign indicates phase inversion - the output signal is 180 degrees out of phase with the input signal.

Q2: What are typical resistance values for op-amp circuits?
A: Typical values range from 1kΩ to 1MΩ, depending on the application and desired gain. Very high resistances may introduce noise issues.

Q3: Can the gain be less than 1?
A: Yes, when R_f < R_in, the gain magnitude is less than 1, creating an attenuator circuit with signal inversion.

Q4: What are the limitations of this formula?
A: This assumes ideal op-amp conditions (infinite input impedance, zero output impedance, infinite gain). Real op-amps have limitations that affect performance.

Q5: How does this differ from non-inverting configuration?
A: Non-inverting configuration uses A_v = 1 + R_f/R_in and maintains the same phase as the input signal.