1. What is Inverting Amplifier Gain?

The inverting amplifier gain represents the voltage amplification factor of an operational amplifier configured in inverting mode. It determines how much the input signal is amplified and inverted at the output.

2. How Does the Calculator Work?

The calculator uses the inverting amplifier gain formula:

Where:

• \( R_f \) — Feedback resistor (Ω)
• \( R_in \) — Input resistor (Ω)
• Negative sign indicates signal inversion

Explanation: The gain is determined solely by the ratio of the feedback resistor to the input resistor. The negative sign indicates that the output signal is 180 degrees out of phase with the input signal.

3. Importance of Gain Calculation

Details: Accurate gain calculation is crucial for designing amplifier circuits, signal processing applications, audio equipment, and control systems where precise signal amplification is required.

4. Using the Calculator

Tips: Enter both resistor values in ohms (Ω). Ensure values are positive and non-zero. The calculator will compute the voltage gain as a unitless ratio.

5. Frequently Asked Questions (FAQ)

Q1: Why is the gain negative?
A: The negative sign indicates that the amplifier inverts the input signal phase by 180 degrees, which is characteristic of inverting amplifier configuration.

Q2: What are typical resistor values used?
A: Typical values range from 1kΩ to 1MΩ. The ratio determines gain, so choose values that provide desired gain while considering op-amp limitations.

Q3: What is the input impedance of inverting amplifier?
A: The input impedance is approximately equal to R_in, since the inverting input is at virtual ground.

Q4: Are there limitations to this configuration?
A: Limited by op-amp specifications like bandwidth, slew rate, and output voltage swing. Very high gains may require special consideration.

Q5: Can I use this for AC signals?
A: Yes, the inverting amplifier works for both DC and AC signals, but frequency response depends on op-amp bandwidth and circuit capacitance.