Emitter Resistance given Threshold Voltage Calculator

✖Threshold voltage of transistor is the minimum gate to source voltage that is needed to create a conducting path between the source and drain terminals.ⓘ Threshold Voltage [V_th]			+10% -10%
✖Emitter Current is the amplified output current of a bipolar junction transistor.ⓘ Emitter Current [I_e]			+10% -10%

✖Emitter Resistance is a dynamic resistance of the emitter-base junction diode of a transistor.ⓘ Emitter Resistance given Threshold Voltage [R_e]

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Emitter Resistance given Threshold Voltage

Formula

`"R"_{"e"} = "V"_{"th"}/"I"_{"e"}`

Example

`"1.083317kΩ"="5.50V"/"5.077mA"`

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Emitter Resistance given Threshold Voltage Solution

STEP 0: Pre-Calculation Summary

Formula Used

Emitter Resistance = Threshold Voltage/Emitter Current
R_e = V_th/I_e
This formula uses 3 Variables

Variables Used

Emitter Resistance - (Measured in Ohm) - Emitter Resistance is a dynamic resistance of the emitter-base junction diode of a transistor.
Threshold Voltage - (Measured in Volt) - Threshold voltage of transistor is the minimum gate to source voltage that is needed to create a conducting path between the source and drain terminals.
Emitter Current - (Measured in Ampere) - Emitter Current is the amplified output current of a bipolar junction transistor.

STEP 1: Convert Input(s) to Base Unit

Threshold Voltage: 5.5 Volt --> 5.5 Volt No Conversion Required
Emitter Current: 5.077 Milliampere --> 0.005077 Ampere (Check conversion here)

STEP 2: Evaluate Formula

Substituting Input Values in Formula

R_e = V_th/I_e --> 5.5/0.005077

Evaluating ... ...

R_e = 1083.31691944061

STEP 3: Convert Result to Output's Unit

1083.31691944061 Ohm -->1.08331691944061 Kilohm (Check conversion here)

FINAL ANSWER

1.08331691944061 ≈ 1.083317 Kilohm <-- Emitter Resistance

(Calculation completed in 00.004 seconds)

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Created by Payal Priya

Birsa Institute of Technology (BIT), Sindri

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Emitter Resistance given Threshold Voltage Formula

Emitter Resistance = Threshold Voltage/Emitter Current
R_e = V_th/I_e

Why input resistance of a transistor is low?

While using a transistor, the emitter-base junction is always forward biased and the collector-base junction is always reverse-biased. Due to it, a small change in emitter current. This means that a small signal voltage variation at the input of the transistor produces a large emitter current variation. This showed that the input resistance of a transistor is low. Since the collector is reverse-biased, it collects all the charge carriers which diffuse into it, through the base. Due to it, a very large change in collector voltage shows only a small change in the collector current. This shows that the output resistance of the transistor is high.

How to Calculate Emitter Resistance given Threshold Voltage?

Emitter Resistance given Threshold Voltage calculator uses Emitter Resistance = Threshold Voltage/Emitter Current to calculate the Emitter Resistance, The Emitter Resistance given threshold voltage suggests that for a small signal, the transistor behaves as a voltage-controlled current source. The input port of the controlled current source is between base and emitter and the output port is in between collector and emitter. Emitter Resistance is denoted by R_e symbol.

How to calculate Emitter Resistance given Threshold Voltage using this online calculator? To use this online calculator for Emitter Resistance given Threshold Voltage, enter Threshold Voltage (V_th) & Emitter Current (I_e) and hit the calculate button. Here is how the Emitter Resistance given Threshold Voltage calculation can be explained with given input values -> 0.001083 = 5.5/0.005077.

FAQ

What is Emitter Resistance given Threshold Voltage?

The Emitter Resistance given threshold voltage suggests that for a small signal, the transistor behaves as a voltage-controlled current source. The input port of the controlled current source is between base and emitter and the output port is in between collector and emitter and is represented as R_e = V_th/I_e or Emitter Resistance = Threshold Voltage/Emitter Current. Threshold voltage of transistor is the minimum gate to source voltage that is needed to create a conducting path between the source and drain terminals & Emitter Current is the amplified output current of a bipolar junction transistor.

How to calculate Emitter Resistance given Threshold Voltage?

The Emitter Resistance given threshold voltage suggests that for a small signal, the transistor behaves as a voltage-controlled current source. The input port of the controlled current source is between base and emitter and the output port is in between collector and emitter is calculated using Emitter Resistance = Threshold Voltage/Emitter Current. To calculate Emitter Resistance given Threshold Voltage, you need Threshold Voltage (V_th) & Emitter Current (I_e). With our tool, you need to enter the respective value for Threshold Voltage & Emitter Current and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

How many ways are there to calculate Emitter Resistance?

In this formula, Emitter Resistance uses Threshold Voltage & Emitter Current. We can use 2 other way(s) to calculate the same, which is/are as follows -

Emitter Resistance = Threshold Voltage/Emitter Current
Emitter Resistance = Small Signal/Signal Current

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