1. What Is Op-Amp Gain?

Operational amplifier (op-amp) gain represents the amplification factor of the circuit. For inverting amplifiers, the gain is determined by the ratio of feedback resistance to input resistance and is negative, indicating signal inversion.

2. How Does The Calculator Work?

The calculator uses the inverting op-amp gain formula:

Where:

• \( Gain \) — Amplification factor (dimensionless)
• \( R_f \) — Feedback resistance (Ω)
• \( R_in \) — Input resistance (Ω)

Explanation: The negative sign indicates that the output signal is inverted relative to the input signal. The gain magnitude is simply the ratio of the two resistances.

3. Importance Of Gain Calculation

Details: Accurate gain calculation is essential for designing amplifier circuits, controlling signal levels, and ensuring proper circuit performance in audio equipment, instrumentation, and control systems.

4. Using The Calculator

Tips: Enter both resistance values in ohms (Ω). Ensure values are positive and non-zero. The calculator will compute the gain with proper sign and unit handling.

5. Frequently Asked Questions (FAQ)

Q1: Why is the gain negative in inverting amplifiers?
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: Common values range from 1kΩ to 1MΩ. Higher resistances reduce power consumption but may increase noise.

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

Q4: What about non-inverting op-amp configuration?
A: Non-inverting configuration uses Gain = 1 + (R_f/R_in) and maintains input signal phase.

Q5: Are there limitations to this formula?
A: This assumes ideal op-amp conditions. Real op-amps have limitations like finite gain-bandwidth product and input/output voltage ranges.