1. What is the Inverting Amplifier Gain?

The inverting amplifier configuration uses an operational amplifier with negative feedback to produce an amplified output signal that is 180 degrees out of phase with the input signal. The gain is determined by the ratio of feedback resistor to input resistor.

2. How Does the Calculator Work?

The calculator uses the inverting amplifier gain formula:

Where:

• \( A_v \) — Voltage gain (V/V)
• \( R_f \) — Feedback resistor (Ω)
• \( R_{in} \) — Input resistor (Ω)

Explanation: The negative sign indicates phase inversion, and the gain magnitude is simply the ratio of the two resistors.

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 both resistor values in ohms (Ω). All values must be positive and non-zero. The calculator will compute the voltage gain with proper phase indication.

5. Frequently Asked Questions (FAQ)

Q1: What does the negative gain mean?
A: The negative sign indicates that the output signal is inverted (180° phase shift) relative to the input signal.

Q2: What are typical resistor values for op-amp circuits?
A: Typical values range from 1kΩ to 1MΩ. Values below 1kΩ may draw excessive current, while values above 1MΩ may be affected by noise.

Q3: Can I use this for non-inverting amplifiers?
A: No, this calculator is specifically for inverting configuration. Non-inverting amplifiers use a different gain formula.

Q4: What is the input impedance of an inverting amplifier?
A: The input impedance is approximately equal to R_in, since the inverting input is at virtual ground.

Q5: Are there limitations to this configuration?
A: The inverting amplifier has lower input impedance than non-inverting configuration and requires careful consideration of op-amp specifications like bandwidth and slew rate.