1. What is Op Amp Current Gain?

The current gain (transimpedance gain) in an operational amplifier circuit represents the ratio of output voltage to input current. For a basic transimpedance amplifier, the gain is equal to the feedback resistor (Rf).

2. How Does the Calculator Work?

The calculator uses the simple formula:

Where:

• \( R_f \) — Feedback resistor value in ohms

Explanation: In a transimpedance amplifier configuration, the output voltage is directly proportional to the input current multiplied by the feedback resistor value.

3. Importance of Current Gain Calculation

Details: Calculating the current gain is essential for designing current-to-voltage conversion circuits, photodiode amplifiers, and other applications where current sensing is required.

4. Using the Calculator

Tips: Enter the feedback resistor value in ohms. The value must be positive and non-zero.

5. Frequently Asked Questions (FAQ)

Q1: What is transimpedance gain?
A: Transimpedance gain is the ratio of output voltage to input current, measured in ohms (volts per ampere).

Q2: What are typical values for Rf?
A: Values range from hundreds of ohms to several megaohms depending on application and desired gain.

Q3: Does this formula work for all op amp configurations?
A: No, this applies specifically to transimpedance amplifier (current-to-voltage converter) configurations.

Q4: What about bandwidth limitations?

Q5: How does input bias current affect the calculation?
A: The formula assumes ideal op amp conditions. In practice, input bias currents may introduce small errors.