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Input Resistance of Mosfet Formula

GoSmall Signal Input Resistance Formula

GoInput Resistance given Transconductance Formula

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The Input Resistance is the resistance seen at the base terminal of the transistor. Check FAQs

r π = \frac{V i}{i c \cdot β 0}

r_π - Input Resistance?V_i - Input Voltage?i_c - Collector Current?β₀ - Small Signal Current Gain?

Input Resistance of Mosfet Example

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Here is how the Input Resistance of Mosfet equation looks like with Values.

Here is how the Input Resistance of Mosfet equation looks like with Units.

Here is how the Input Resistance of Mosfet equation looks like.

0.2364 = \frac{2.1}{1.89 \cdot 4.7}

0.2364Ω = \frac{2.1V}{1.89A \cdot 4.7}

0.2364 = \frac{2.1}{1.89 \cdot 4.7}

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Input Resistance of Mosfet Solution

Follow our step by step solution on how to calculate Input Resistance of Mosfet?

FIRST Step Consider the formula

r π = \frac{V i}{i c \cdot β 0}

Next Step Substitute values of Variables

∴

r π = \frac{2.1V}{1.89A \cdot 4.7}

Next Step Prepare to Evaluate

∴

r π = \frac{2.1}{1.89 \cdot 4.7}

Next Step Evaluate

∴

r π = 0.236406619385343Ω

LAST Step Rounding Answer

∴

r π = 0.2364Ω

Input Resistance of Mosfet Formula Elements

Variables

Input Resistance

The Input Resistance is the resistance seen at the base terminal of the transistor.

Symbol: r_π

Measurement: Electric ResistanceUnit: Ω

Note: Value should be greater than 0.

Formulas to find Input Resistance

Input Voltage

The Input Voltage is the voltage applied to the base terminal. It is the voltage difference between the base terminal and the emitter terminal of the transistor.

Symbol: V_i

Measurement: Electric PotentialUnit: V

Note: Value should be greater than 0.

Formulas to find Input Voltage

Collector Current

The Collector Current s the current that flows through the collector terminal. It is the current that is controlled by the base current.

Symbol: i_c

Measurement: Electric CurrentUnit: A

Note: Value should be greater than 0.

Formulas to find Collector Current

Small Signal Current Gain

Small Signal Current Gain is a measure of how much the collector current changes in response to a small change in the base current .

Symbol: β₀

Measurement: NAUnit: Unitless

Note: Value should be greater than 0.

Formulas to find Small Signal Current Gain

Other Formulas to find Input Resistance

Go Small Signal Input Resistance

r π = \frac{V i}{i b}

Go Input Resistance given Transconductance

r π = \frac{β 0}{g m}

Other formulas in Resistance category

Go MOSFET as Linear Resistance given Aspect Ratio

R ds = \frac{L}{μ s \cdot C ox \cdot W c \cdot V eff}

Go Electron Mean Free Path

λ = \frac{1}{R out \cdot i d}

Go Drain Output Resistance

R out = \frac{1}{λ \cdot i d}

Go Finite Resistance between Drain and Source

R fi = mod \underset{̲}{u} s \frac{V a}{i d}

How to Evaluate Input Resistance of Mosfet?

Input Resistance of Mosfet evaluator uses Input Resistance = Input Voltage/(Collector Current*Small Signal Current Gain) to evaluate the Input Resistance, The Input Resistance of Mosfet formula is defined as the resistance seen at the gate terminal of the MOSFET. It is a measure of how much the gate current changes when the gate voltage is changed. Input Resistance is denoted by r_π symbol.

How to evaluate Input Resistance of Mosfet using this online evaluator? To use this online evaluator for Input Resistance of Mosfet, enter Input Voltage (V_i), Collector Current (i_c) & Small Signal Current Gain (β₀) and hit the calculate button.

FAQs on Input Resistance of Mosfet

What is the formula to find Input Resistance of Mosfet?

The formula of Input Resistance of Mosfet is expressed as Input Resistance = Input Voltage/(Collector Current*Small Signal Current Gain). Here is an example- 0.236407 = 2.1/(1.89*4.7).

How to calculate Input Resistance of Mosfet?

With Input Voltage (V_i), Collector Current (i_c) & Small Signal Current Gain (β₀) we can find Input Resistance of Mosfet using the formula - Input Resistance = Input Voltage/(Collector Current*Small Signal Current Gain).

What are the other ways to Calculate Input Resistance?

Here are the different ways to Calculate Input Resistance-

Input Resistance=Input Voltage/Base Current
Input Resistance=Small Signal Current Gain/Transconductance

Can the Input Resistance of Mosfet be negative?

No, the Input Resistance of Mosfet, measured in Electric Resistance cannot be negative.

Which unit is used to measure Input Resistance of Mosfet?

Input Resistance of Mosfet is usually measured using the Ohm[Ω] for Electric Resistance. Megohm[Ω], Microhm[Ω], Volt per Ampere[Ω] are the few other units in which Input Resistance of Mosfet can be measured.

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: Value
: Unit

Input Resistance of Mosfet Formula

​GoSmall Signal Input Resistance Formula

​GoInput Resistance given Transconductance Formula

Input Resistance of Mosfet Example

Input Resistance of Mosfet Solution

Input Resistance of Mosfet Formula Elements

Other Formulas to find Input Resistance

Other formulas in Resistance category

How to Evaluate Input Resistance of Mosfet?

FAQs on Input Resistance of Mosfet

Variable Name

GoSmall Signal Input Resistance Formula

GoInput Resistance given Transconductance Formula