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Drain Saturation Current of MOSFET Formula

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Saturation drain current is an important parameter in the design & analysis of MOSFET, as it determines the max current that can be handled by the MOSFET without exceed its safe operating limits. Check FAQs

I d(sat) = \frac{1}{2} \cdot k' p \cdot \frac{W c}{L} \cdot {(V eff)}^{2}

I_d(sat) - Saturation Drain Current?k'_p - Process Transconductance in PMOS?W_c - Channel Width?L - Channel Length?V_eff - Effective Voltage?

Drain Saturation Current of MOSFET Example

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

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

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

0.0838 = \frac{1}{2} \cdot 0.58 \cdot \frac{10}{100} \cdot {(1.7)}^{2}

0.0838mA = \frac{1}{2} \cdot 0.58mS \cdot \frac{10μm}{100μm} \cdot {(1.7V)}^{2}

0.0838 = \frac{1}{2} \cdot 0.58 \cdot \frac{10}{100} \cdot {(1.7)}^{2}

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Drain Saturation Current of MOSFET Solution

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

FIRST Step Consider the formula

I d(sat) = \frac{1}{2} \cdot k' p \cdot \frac{W c}{L} \cdot {(V eff)}^{2}

Next Step Substitute values of Variables

∴

I d(sat) = \frac{1}{2} \cdot 0.58mS \cdot \frac{10μm}{100μm} \cdot {(1.7V)}^{2}

Next Step Convert Units

∴

I d(sat) = \frac{1}{2} \cdot 0.0006S \cdot \frac{1E-5m}{0.0001m} \cdot {(1.7V)}^{2}

Next Step Prepare to Evaluate

∴

I d(sat) = \frac{1}{2} \cdot 0.0006 \cdot \frac{1E-5}{0.0001} \cdot {(1.7)}^{2}

Next Step Evaluate

∴

I d(sat) = 8.381E-05A

Next Step Convert to Output's Unit

∴

I d(sat) = 0.08381mA

LAST Step Rounding Answer

∴

I d(sat) = 0.0838mA

Drain Saturation Current of MOSFET Formula Elements

Variables

Saturation Drain Current

Saturation drain current is an important parameter in the design & analysis of MOSFET, as it determines the max current that can be handled by the MOSFET without exceed its safe operating limits.

Symbol: I_d(sat)

Measurement: Electric CurrentUnit: mA

Note: Value should be greater than 0.

Formulas to find Saturation Drain Current

Process Transconductance in PMOS

Process transconductance in PMOS refers to the gain of a PMOS transistor with respect to its gate-source voltage.

Symbol: k'_p

Measurement: Electric ConductanceUnit: mS

Note: Value can be positive or negative.

Formulas to find Process Transconductance in PMOS

Channel Width

Channel width refers to the range of frequencies used for transmitting data over a wireless communication channel. It is also known as bandwidth and is measured in hertz (Hz).

Symbol: W_c

Measurement: LengthUnit: μm

Note: Value should be greater than 0.

Formulas to find Channel Width

Channel Length

Channel length refers to the distance between the source and drain terminals in a field-effect transistor (FET).

Symbol: L

Measurement: LengthUnit: μm

Note: Value should be greater than 0.

Formulas to find Channel Length

Effective Voltage

The effective voltage in a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) is the voltage that determines the behavior of the device. It is also known as the gate-source voltage.

Symbol: V_eff

Measurement: Electric PotentialUnit: V

Note: Value should be greater than 0.

Formulas to find Effective Voltage

Other formulas in Current category

Go First Drain Current of MOSFET on Large-Signal Operation

I d1 = \frac{I b}{2} + \frac{I b}{V ov} \cdot \frac{V id}{2} \cdot \sqrt{1 - \frac{{V id}^{2}}{4 \cdot {V ov}^{2}}}

Go Second Drain Current of MOSFET on Large-Signal Operation

I d2 = \frac{I b}{2} - \frac{I b}{V ov} \cdot \frac{V id}{2} \cdot \sqrt{1 - \frac{{(V id)}^{2}}{4 \cdot {V ov}^{2}}}

Go Drain Current of MOSFET on Large-Signal Operation given Overdrive Voltage

i d = (\frac{I b}{V ov}) \cdot (\frac{V id}{2})

Go First Drain Current of MOSFET on Large-Signal Operation given Overdrive Voltage

I d1 = \frac{I b}{2} + \frac{I b}{V ov} \cdot \frac{V id}{2}

How to Evaluate Drain Saturation Current of MOSFET?

Drain Saturation Current of MOSFET evaluator uses Saturation Drain Current = 1/2*Process Transconductance in PMOS*Channel Width/Channel Length*(Effective Voltage)^2 to evaluate the Saturation Drain Current, The Drain saturation current of MOSFET here "saturation" in MOSFETs means that change in V_DS will not produce a significant change in the I_d (drain current). You can think about MOSFET in saturation as a current source. Saturation Drain Current is denoted by I_d(sat) symbol.

How to evaluate Drain Saturation Current of MOSFET using this online evaluator? To use this online evaluator for Drain Saturation Current of MOSFET, enter Process Transconductance in PMOS (k'_p), Channel Width (W_c), Channel Length (L) & Effective Voltage (V_eff) and hit the calculate button.

FAQs on Drain Saturation Current of MOSFET

What is the formula to find Drain Saturation Current of MOSFET?

The formula of Drain Saturation Current of MOSFET is expressed as Saturation Drain Current = 1/2*Process Transconductance in PMOS*Channel Width/Channel Length*(Effective Voltage)^2. Here is an example- 83.81 = 1/2*0.00058*1E-05/0.0001*(1.7)^2.

How to calculate Drain Saturation Current of MOSFET?

With Process Transconductance in PMOS (k'_p), Channel Width (W_c), Channel Length (L) & Effective Voltage (V_eff) we can find Drain Saturation Current of MOSFET using the formula - Saturation Drain Current = 1/2*Process Transconductance in PMOS*Channel Width/Channel Length*(Effective Voltage)^2.

Can the Drain Saturation Current of MOSFET be negative?

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

Which unit is used to measure Drain Saturation Current of MOSFET?

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

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Drain Saturation Current of MOSFET Formula

Drain Saturation Current of MOSFET Example

Drain Saturation Current of MOSFET Solution

Drain Saturation Current of MOSFET Formula Elements

Other formulas in Current category

How to Evaluate Drain Saturation Current of MOSFET?

FAQs on Drain Saturation Current of MOSFET

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