Enter the collector resistor, emitter resistor, or voltage gain into the calculator to calculate the missing parameter.
Related Calculators
- Superposition Calculator
- Norton’S Theorem Calculator
- Instantaneous Current Calculator
- Rise Time Calculator
- All Physics Calculators
Common Emitter Amplifier Formula
The following equation is used to calculate the voltage gain in a common emitter amplifier.
V_A = - (R_C / R_E)
- Where V_A is the Voltage Gain (Vout/Vin)
- R_C is the Collector Resistor (Ω)
- R_E is the Emitter Resistor (Ω)
To calculate the missing parameter, leave exactly one field blank and fill in the other two values.
What is a Common Emitter Amplifier?
Definition:
A common emitter amplifier is a basic transistor configuration where the emitter is common to both the input and output circuits. It is widely used in analog electronics to provide significant voltage gain with an inverted output signal.
How to Calculate a Common Emitter Amplifier?
Example Problem:
The following example outlines the steps and values needed to calculate the missing parameter in a common emitter amplifier.
First, determine the collector resistor value. In this example, the collector resistor is 1000 Ω.
Next, determine the emitter resistor value. In this case, the emitter resistor is 250 Ω.
Finally, calculate the voltage gain using the formula above:
V_A = – (R_C / R_E)
V_A = – (1000 / 250)
V_A = -4
FAQ
Why is there a negative sign in the voltage gain equation?
The negative sign indicates that the output signal is 180° out of phase with the input signal in a common emitter amplifier.
Can I use this calculator for designing high-frequency amplifiers?
This calculator provides basic calculations for a common emitter amplifier configuration. Additional considerations are necessary when designing amplifiers for high-frequency applications.
What does leaving one field empty achieve?
By leaving one field empty, the calculator computes the missing value based on the other two provided values using the amplifier formula.