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Drain Output Resistance Formula

GoOutput Resistance of Differential Amplifier Formula

GoOutput Resistance of Mosfet Formula

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Output resistance refers to the resistance of an electronic circuit to the flow of current when a load is connected to its output. Check FAQs

R out = \frac{1}{λ \cdot i d}

R_out - Output Resistance?λ - Electron Mean Free Path?i_d - Drain Current?

Drain Output Resistance Example

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With units

Only example

Here is how the Drain Output Resistance equation looks like with Values.

Here is how the Drain Output Resistance equation looks like with Units.

Here is how the Drain Output Resistance equation looks like.

4.4964 = \frac{1}{2.78 \cdot 0.08}

4.4964kΩ = \frac{1}{2.78 \cdot 0.08mA}

4.4964 = \frac{1}{2.78 \cdot 0.08}

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Drain Output Resistance Solution

Follow our step by step solution on how to calculate Drain Output Resistance?

FIRST Step Consider the formula

R out = \frac{1}{λ \cdot i d}

Next Step Substitute values of Variables

∴

R out = \frac{1}{2.78 \cdot 0.08mA}

Next Step Convert Units

∴

R out = \frac{1}{2.78 \cdot 8E-5A}

Next Step Prepare to Evaluate

∴

R out = \frac{1}{2.78 \cdot 8E-5}

Next Step Evaluate

∴

R out = 4496.40287769784Ω

Next Step Convert to Output's Unit

∴

R out = 4.49640287769784kΩ

LAST Step Rounding Answer

∴

R out = 4.4964kΩ

Drain Output Resistance Formula Elements

Variables

Output Resistance

Output resistance refers to the resistance of an electronic circuit to the flow of current when a load is connected to its output.

Symbol: R_out

Measurement: Electric ResistanceUnit: kΩ

Note: Value should be greater than 0.

Formulas to find Output Resistance

Electron Mean Free Path

Electron Mean Free Path which represents the average distance an electron can travel without scattering with impurities, defeat, or other obstacles within the solid state device.

Symbol: λ

Measurement: NAUnit: Unitless

Note: Value can be positive or negative.

Formulas to find Electron Mean Free Path

Drain Current

Drain current is the current that flows between the drain and the source terminals of a field-effect transistor (FET), which is a type of transistor commonly used in electronic circuits.

Symbol: i_d

Measurement: Electric CurrentUnit: mA

Note: Value should be greater than 0.

Formulas to find Drain Current

Other Formulas to find Output Resistance

Go Output Resistance of Differential Amplifier

R out = \frac{(V cin \cdot g m) - I t}{2 \cdot g m \cdot I t}

Go Output Resistance of Mosfet

R out = \frac{v a}{i c}

Go Output Resistance given Transconductance

R out = \frac{1}{η \cdot g m}

Go Output Resistance given Channel Length Modulation

R out = \frac{1}{λ c \cdot i d}

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 Finite Resistance between Drain and Source

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

Go MOSFET as Linear Resistance

R ds = \frac{1}{G}

How to Evaluate Drain Output Resistance?

Drain Output Resistance evaluator uses Output Resistance = 1/(Electron Mean Free Path*Drain Current) to evaluate the Output Resistance, Drain Output Resistance is defined to find the “extra” drain current which arises due to channel length modulation as the current flowing through a drain output resistor. Output Resistance is denoted by R_out symbol.

How to evaluate Drain Output Resistance using this online evaluator? To use this online evaluator for Drain Output Resistance, enter Electron Mean Free Path (λ) & Drain Current (i_d) and hit the calculate button.

FAQs on Drain Output Resistance

What is the formula to find Drain Output Resistance?

The formula of Drain Output Resistance is expressed as Output Resistance = 1/(Electron Mean Free Path*Drain Current). Here is an example- 0.004496 = 1/(2.78*8E-05).

How to calculate Drain Output Resistance?

With Electron Mean Free Path (λ) & Drain Current (i_d) we can find Drain Output Resistance using the formula - Output Resistance = 1/(Electron Mean Free Path*Drain Current).

What are the other ways to Calculate Output Resistance?

Here are the different ways to Calculate Output Resistance-

Output Resistance=((Common Mode Input Signal*Transconductance)-Total Current)/(2*Transconductance*Total Current)
Output Resistance=Early Voltage/Collector Current
Output Resistance=1/(Carrier Mobility*Transconductance)

Can the Drain Output Resistance be negative?

No, the Drain Output Resistance, measured in Electric Resistance cannot be negative.

Which unit is used to measure Drain Output Resistance?

Drain Output Resistance is usually measured using the Kilohm[kΩ] for Electric Resistance. Ohm[kΩ], Megohm[kΩ], Microhm[kΩ] are the few other units in which Drain Output Resistance can be measured.

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