Output Current Calculator

Formula:

\[ I_{out} = I_{ref} \times \frac{I_{t2}}{I_{t1}} \]

Output Current:

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1. What is the Output Current Formula?

The output current formula calculates the output current in a BJT current mirror circuit based on the reference current and the current values in the two transistors. It provides an accurate assessment of the output current in current mirror configurations.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ I_{out} = I_{ref} \times \frac{I_{t2}}{I_{t1}} \]

Where:

\( I_{out} \) — Output Current (A)
\( I_{ref} \) — Reference Current (A)
\( I_{t2} \) — Current in Transistor 2 (A)
\( I_{t1} \) — Current in Transistor 1 (A)

Explanation: The formula calculates the output current by scaling the reference current based on the ratio of currents in the two transistors of the BJT current mirror.

3. Importance of Output Current Calculation

Details: Accurate output current calculation is crucial for designing and analyzing current mirror circuits, ensuring proper current scaling and mirroring in analog circuit designs.

4. Using the Calculator

Tips: Enter reference current, current in transistor 2, and current in transistor 1 in amperes. All values must be positive and greater than zero.

5. Frequently Asked Questions (FAQ)

Q1: What is a BJT current mirror?
A: A BJT current mirror is a circuit configuration that copies or mirrors the current flowing through one active device to another, maintaining a constant current flow.

Q2: Why is the current ratio important?
A: The current ratio determines how the reference current is scaled to produce the output current in the current mirror circuit.

Q3: What are typical applications of current mirrors?
A: Current mirrors are widely used in analog integrated circuits for biasing, active loads, and current scaling applications.

Q4: Are there limitations to this formula?
A: The formula assumes ideal transistor matching and may need adjustments for real-world factors like transistor mismatches and temperature variations.

Q5: Can this calculator be used for MOSFET current mirrors?
A: While the principle is similar, MOSFET current mirrors have different characteristics and may require different calculations.