1. What is Op-Amp Gain?

The operational amplifier (op-amp) gain represents the amplification factor of the inverting amplifier configuration. It determines how much the input signal is amplified by the circuit.

2. How Does the Calculator Work?

The calculator uses the op-amp gain formula:

Where:

• \( R_f \) — Feedback resistance (Ω)
• \( R_{in} \) — Input resistance (Ω)
• \( Gain \) — Amplification factor (dimensionless)

Explanation: The negative sign indicates phase inversion (180° phase shift) in the inverting amplifier configuration. The gain magnitude is determined by the ratio of feedback to input resistance.

3. Importance of Gain Calculation

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

4. Using the Calculator

Tips: Enter feedback resistance (R_f) and input resistance (R_in) 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?
A: The negative sign indicates that the inverting amplifier configuration produces a 180° phase shift between input and output signals.

Q2: What are typical resistance values?
A: Typical values range from 1kΩ to 1MΩ, depending on application requirements and op-amp specifications.

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

Q4: What are practical limitations?
A: Real op-amps have finite gain-bandwidth product, slew rate limitations, and maximum output voltage swing.

Q5: How does this differ from non-inverting configuration?
A: Non-inverting configuration uses Gain = 1 + (R_f/R_in) and maintains phase integrity (no negative sign).