Op Amp Inverter Calculator

Op Amp Inverter Formula:

\[ V_{out} = -V_{in} \times \frac{R_f}{R_{in}} \]

Output Voltage (V_out):

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1. What is an Op Amp Inverter?

The operational amplifier (op amp) inverting amplifier is a basic circuit configuration that produces an output voltage that is the inverse of the input voltage, amplified by the ratio of the feedback resistor to the input resistor.

2. How Does the Calculator Work?

The calculator uses the inverting amplifier equation:

\[ V_{out} = -V_{in} \times \frac{R_f}{R_{in}} \]

Where:

\( V_{out} \) — Output voltage (V)
\( V_{in} \) — Input voltage (V)
\( R_f \) — Feedback resistor (Ω)
\( R_{in} \) — Input resistor (Ω)

Explanation: The negative sign indicates phase inversion (180° shift). The gain is determined by the resistor ratio.

3. Importance of Inverting Amplifier

Details: Inverting amplifiers are fundamental building blocks in analog electronics, used for signal processing, amplification, and filtering applications.

4. Using the Calculator

Tips: Enter input voltage and resistor values. All values must be valid (R_in ≠ 0). The calculator will compute the output voltage.

5. Frequently Asked Questions (FAQ)

Q1: What is the ideal op amp assumption?
A: The calculation assumes infinite input impedance, zero output impedance, and infinite open-loop gain.

Q2: What are typical resistor values?
A: Common values range from 1kΩ to 100kΩ. Avoid extremely low values that may overload the op amp.

Q3: Can I use this for AC signals?
A: Yes, the equation applies to both DC and AC signals, though AC performance depends on the op amp's frequency response.

Q4: What about non-ideal effects?
A: Real op amps have limitations like bandwidth, slew rate, and input offset voltage that may affect performance.

Q5: How do I choose resistor values?
A: Select values that provide desired gain while keeping currents within the op amp's capabilities and minimizing noise.