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Drain Current of MOSFET Small Signal Formula

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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. Check FAQs

i d = \frac{1}{λ \cdot R out}

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

Drain Current of MOSFET Small Signal Example

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Here is how the Drain Current of MOSFET Small Signal equation looks like with Values.

Here is how the Drain Current of MOSFET Small Signal equation looks like with Units.

Here is how the Drain Current of MOSFET Small Signal equation looks like.

0.0799 = \frac{1}{2.78 \cdot 4.5}

0.0799mA = \frac{1}{2.78 \cdot 4.5kΩ}

0.0799 = \frac{1}{2.78 \cdot 4.5}

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Drain Current of MOSFET Small Signal Solution

Follow our step by step solution on how to calculate Drain Current of MOSFET Small Signal?

FIRST Step Consider the formula

i d = \frac{1}{λ \cdot R out}

Next Step Substitute values of Variables

∴

i d = \frac{1}{2.78 \cdot 4.5kΩ}

Next Step Convert Units

∴

i d = \frac{1}{2.78 \cdot 4500Ω}

Next Step Prepare to Evaluate

∴

i d = \frac{1}{2.78 \cdot 4500}

Next Step Evaluate

∴

i d = 7.99360511590727E-05A

Next Step Convert to Output's Unit

∴

i d = 0.0799360511590727mA

LAST Step Rounding Answer

∴

i d = 0.0799mA

Drain Current of MOSFET Small Signal Formula Elements

Variables

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

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

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

Other formulas in Small Signal Analysis category

Go Transconductance Given Small Signal Parameters

g m = 2 \cdot K n \cdot (V gsq - V t)

Go Output Voltage of Small Signal P-Channel

V out = g m \cdot V sg \cdot (\frac{R out \cdot R d}{R d + R out})

Go Small-Signal Voltage Gain with respect to Drain Resistance

A v = (g m \cdot (\frac{R out \cdot R d}{R out + R d}))

Go Small Signal Output Voltage

V out = g m \cdot V sg \cdot R L

How to Evaluate Drain Current of MOSFET Small Signal?

Drain Current of MOSFET Small Signal evaluator uses Drain Current = 1/(Electron Mean Free Path*Output Resistance) to evaluate the Drain Current, Drain Current of MOSFET Small Signal is current entering drain terminal of NMOS, MOSFETs only switch current flowing in one direction; they have a diode between source and drain in the other direction (in other words, if the drain (on an N-channel device) falls below the voltage on the source, the current will flow from the source to the drain). Drain Current is denoted by i_d symbol.

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

FAQs on Drain Current of MOSFET Small Signal

What is the formula to find Drain Current of MOSFET Small Signal?

The formula of Drain Current of MOSFET Small Signal is expressed as Drain Current = 1/(Electron Mean Free Path*Output Resistance). Here is an example- 79.93605 = 1/(2.78*4500).

How to calculate Drain Current of MOSFET Small Signal?

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

Can the Drain Current of MOSFET Small Signal be negative?

No, the Drain Current of MOSFET Small Signal, measured in Electric Current cannot be negative.

Which unit is used to measure Drain Current of MOSFET Small Signal?

Drain Current of MOSFET Small Signal is usually measured using the Milliampere[mA] for Electric Current. Ampere[mA], Microampere[mA], Centiampere[mA] are the few other units in which Drain Current of MOSFET Small Signal can be measured.

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