Loop Gain Of Feedback Amplifier Calculator

Loop Gain Formula:

\[ Loop\ Gain = \frac{Returned\ Signal}{Test\ Signal} \]

Loop Gain (Aβ):

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1. What is Loop Gain of Feedback Amplifier?

Loop Gain is calculated by imagining the feedback loop is broken at some point and calculating the net gain if a signal is applied. It represents the product of gains around the feedback loop and is crucial for stability analysis in feedback systems.

2. How Does the Calculator Work?

The calculator uses the Loop Gain formula:

\[ Loop\ Gain = \frac{Returned\ Signal}{Test\ Signal} \]

Where:

\( Returned\ Signal \) — The returned signal is the product of the loop gain and test signal (Volt)
\( Test\ Signal \) — The test signal is a step signal with a step size expressed as the percentage change P in the correction unit (Volt)

Explanation: The equation calculates the loop gain by dividing the returned signal by the test signal applied to the feedback system.

3. Importance of Loop Gain Calculation

Details: Loop gain calculation is essential for analyzing the stability and performance of feedback amplifiers. It helps determine system stability margins and predict oscillatory behavior in closed-loop systems.

4. Using the Calculator

Tips: Enter returned signal and test signal values in Volts. Both values must be positive and valid for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: What is the significance of loop gain in feedback systems?
A: Loop gain determines the stability and performance characteristics of feedback systems. Higher loop gain generally improves accuracy but may reduce stability.

Q2: How is loop gain different from open-loop gain?
A: Open-loop gain refers to the gain of the amplifier without feedback, while loop gain is the product of gains around the complete feedback loop.

Q3: What values indicate a stable feedback system?
A: For stability, the loop gain should be less than 1 at the frequency where the phase shift reaches 180 degrees (phase margin > 0).

Q4: Can loop gain be negative?
A: Yes, loop gain can be negative, which indicates phase inversion in the feedback path and can affect system stability.

Q5: How does loop gain affect system bandwidth?
A: Higher loop gain typically increases system bandwidth but may introduce stability issues that need to be carefully managed.