Overall Feedback Voltage Gain Of Common-Emitter Amplifier Calculator

Formula Used:

\[ G_{fv} = -\alpha \times \frac{R_c}{R_e} \times \frac{R_{in}}{R_{in} + R_{sig}} \]

Common Base Current Gain (α):

(unitless)

Collector Resistance (Rc):

Ohm

Emitter Resistance (Re):

Ohm

Input Resistance (Rin):

Ohm

Signal Resistance (Rsig):

Ohm

Overall Feedback Voltage Gain (Gfv):

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1. What Is The Overall Feedback Voltage Gain Of Common-Emitter Amplifier?

The Overall Feedback Voltage Gain of a Common-Emitter Amplifier is a measure of the amplifier's voltage gain when feedback is applied. It represents the ratio of output voltage to input voltage, taking into account the feedback mechanism that helps stabilize the amplifier's performance.

2. How Does The Calculator Work?

The calculator uses the formula:

\[ G_{fv} = -\alpha \times \frac{R_c}{R_e} \times \frac{R_{in}}{R_{in} + R_{sig}} \]

Where:

\( \alpha \) — Common Base Current Gain (unitless)
\( R_c \) — Collector Resistance (Ohm)
\( R_e \) — Emitter Resistance (Ohm)
\( R_{in} \) — Input Resistance (Ohm)
\( R_{sig} \) — Signal Resistance (Ohm)

Explanation: The formula calculates the overall feedback voltage gain by considering the common base current gain, the ratio of collector to emitter resistance, and the voltage division between input and signal resistances.

3. Importance Of Feedback Voltage Gain Calculation

Details: Calculating the feedback voltage gain is essential for designing and analyzing amplifier circuits. It helps in determining the stability, bandwidth, and linearity of the amplifier, ensuring optimal performance in various electronic applications.

4. Using The Calculator

Tips: Enter all resistance values in Ohms and the common base current gain as a unitless value between 0 and 1. Ensure all values are positive and non-zero for accurate results.

5. Frequently Asked Questions (FAQ)

Q1: What is the significance of the negative sign in the formula?
A: The negative sign indicates that the output voltage is inverted relative to the input voltage, which is characteristic of common-emitter amplifiers.

Q2: How does feedback affect the amplifier's performance?
A: Feedback helps in reducing distortion, increasing bandwidth, and improving the stability of the amplifier by controlling the gain.

Q3: What are typical values for common base current gain (α)?
A: The common base current gain (α) typically ranges from 0.95 to 0.995 for most transistors, representing the fraction of emitter current that reaches the collector.

Q4: Can this calculator be used for different amplifier configurations?
A: This calculator is specifically designed for common-emitter amplifiers with feedback. Other configurations may require different formulas.

Q5: Why is input resistance important in this calculation?
A: Input resistance affects how much of the signal voltage is delivered to the amplifier input, influencing the overall gain and performance.