1. What is Op Amp Inverter Gain?

The op amp inverter gain determines the amplification factor of an inverting operational amplifier circuit. It specifies how much the input signal is amplified (and inverted) by the circuit.

2. How Does the Calculator Work?

The calculator uses the inverting amplifier gain formula:

Where:

• \( R_f \) — Feedback resistor (ohms)
• \( R_{in} \) — Input resistor (ohms)

Explanation: The negative sign indicates signal inversion. The gain magnitude is determined by the ratio of the feedback resistor to the input resistor.

3. Importance of Gain Calculation

Details: Accurate gain calculation is crucial for designing amplifier circuits with desired signal amplification characteristics while maintaining stability.

4. Using the Calculator

Tips: Enter resistor values in ohms. Both values must be positive numbers. The calculator will compute the gain (a negative number indicating inversion).

5. Frequently Asked Questions (FAQ)

Q1: Why is the gain negative?
A: The negative sign indicates that the amplifier inverts the input signal (180° phase shift).

Q2: What are typical resistor values?
A: Common values range from 1kΩ to 100kΩ, but depend on application requirements and op amp specifications.

Q3: Can the gain be less than 1?
A: Yes, when Rf is smaller than Rin, the circuit attenuates (reduces) the input signal while inverting it.

Q4: What about non-ideal op amps?
A: This calculation assumes an ideal op amp. Real op amps have limitations like finite gain-bandwidth product.

Q5: How does this differ from non-inverting amplifier?
A: Non-inverting amplifier has positive gain (no signal inversion) and different gain formula: 1 + (Rf/Rin).