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Transconductance of FET Formula

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Forward Transconductance FET refers to the change in output current resulting from a change in input voltage, indicating the device's amplification capability. Check FAQs

G m(fet) = \frac{2 \cdot I dss(fet)}{V off(fet)} \cdot (1 - \frac{V ds(fet)}{V off(fet)})

G_m(fet) - Forward Transconductance FET?I_dss(fet) - Zero Bias Drain Current?V_off(fet) - Pinch OFF Voltage?V_ds(fet) - Drain Source Voltage FET?

Transconductance of FET Example

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Here is how the Transconductance of FET equation looks like with Values.

Here is how the Transconductance of FET equation looks like with Units.

Here is how the Transconductance of FET equation looks like.

0.0201 = \frac{2 \cdot 0.69}{63.56} \cdot (1 - \frac{4.8}{63.56})

0.0201mS = \frac{2 \cdot 0.69mA}{63.56V} \cdot (1 - \frac{4.8V}{63.56V})

0.0201 = \frac{2 \cdot 0.69}{63.56} \cdot (1 - \frac{4.8}{63.56})

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Transconductance of FET Solution

Follow our step by step solution on how to calculate Transconductance of FET?

FIRST Step Consider the formula

G m(fet) = \frac{2 \cdot I dss(fet)}{V off(fet)} \cdot (1 - \frac{V ds(fet)}{V off(fet)})

Next Step Substitute values of Variables

∴

G m(fet) = \frac{2 \cdot 0.69mA}{63.56V} \cdot (1 - \frac{4.8V}{63.56V})

Next Step Convert Units

∴

G m(fet) = \frac{2 \cdot 0.0007A}{63.56V} \cdot (1 - \frac{4.8V}{63.56V})

Next Step Prepare to Evaluate

∴

G m(fet) = \frac{2 \cdot 0.0007}{63.56} \cdot (1 - \frac{4.8}{63.56})

Next Step Evaluate

∴

G m(fet) = 2.00721131473024E-05S

Next Step Convert to Output's Unit

∴

G m(fet) = 0.0200721131473024mS

LAST Step Rounding Answer

∴

G m(fet) = 0.0201mS

Transconductance of FET Formula Elements

Variables

Forward Transconductance FET

Forward Transconductance FET refers to the change in output current resulting from a change in input voltage, indicating the device's amplification capability.

Symbol: G_m(fet)

Measurement: Electric ConductanceUnit: mS

Note: Value should be greater than 0.

Formulas to find Forward Transconductance FET

Zero Bias Drain Current

Zero Bias Drain Current in a FET is the drain current that flows when the gate voltage is equal to zero.

Symbol: I_dss(fet)

Measurement: Electric CurrentUnit: mA

Note: Value can be positive or negative.

Formulas to find Zero Bias Drain Current

Pinch OFF Voltage

Pinch OFF Voltage is the voltage at which the channel of a field-effect transistor (FET) becomes so narrow that it effectively closes, preventing any further current flow.

Symbol: V_off(fet)

Measurement: Electric PotentialUnit: V

Note: Value can be positive or negative.

Formulas to find Pinch OFF Voltage

Drain Source Voltage FET

Drain Source Voltage FET is the voltage between the drain and the source terminal of an FET.

Symbol: V_ds(fet)

Measurement: Electric PotentialUnit: V

Note: Value can be positive or negative.

Formulas to find Drain Source Voltage FET

Other formulas in FET category

Go Pinch off Voltage of FET

V off(fet) = V ds-off(fet) - V ds(fet)

Go Drain Current of FET

I d(fet) = I dss(fet) \cdot {(1 - \frac{V ds(fet)}{V cut-off(fet)})}^{2}

Go Drain Source Voltage of FET

V ds(fet) = V dd(fet) - I d(fet) \cdot (R d(fet) + R s(fet))

Go Voltage Gain of FET

A v(fet) = - G m(fet) \cdot R d(fet)

How to Evaluate Transconductance of FET?

Transconductance of FET evaluator uses Forward Transconductance FET = (2*Zero Bias Drain Current)/Pinch OFF Voltage*(1-Drain Source Voltage FET/Pinch OFF Voltage) to evaluate the Forward Transconductance FET, Transconductance of FET is a measure of how much its drain current changes in response to a change in its gate voltage. The transconductance of an FET is not constant, but varies depending on the operating point of the FET. The operating point is determined by the gate voltage and the drain current. The transconductance is highest at the center of the operating range and decreases towards the edges. Forward Transconductance FET is denoted by G_m(fet) symbol.

How to evaluate Transconductance of FET using this online evaluator? To use this online evaluator for Transconductance of FET, enter Zero Bias Drain Current (I_dss(fet)), Pinch OFF Voltage (V_off(fet)) & Drain Source Voltage FET (V_ds(fet)) and hit the calculate button.

FAQs on Transconductance of FET

What is the formula to find Transconductance of FET?

The formula of Transconductance of FET is expressed as Forward Transconductance FET = (2*Zero Bias Drain Current)/Pinch OFF Voltage*(1-Drain Source Voltage FET/Pinch OFF Voltage). Here is an example- 21.70678 = (2*0.00069)/63.56*(1-4.8/63.56).

How to calculate Transconductance of FET?

With Zero Bias Drain Current (I_dss(fet)), Pinch OFF Voltage (V_off(fet)) & Drain Source Voltage FET (V_ds(fet)) we can find Transconductance of FET using the formula - Forward Transconductance FET = (2*Zero Bias Drain Current)/Pinch OFF Voltage*(1-Drain Source Voltage FET/Pinch OFF Voltage).

Can the Transconductance of FET be negative?

No, the Transconductance of FET, measured in Electric Conductance cannot be negative.

Which unit is used to measure Transconductance of FET?

Transconductance of FET is usually measured using the Millisiemens[mS] for Electric Conductance. Siemens[mS], Megasiemens[mS], Mho[mS] are the few other units in which Transconductance of FET can be measured.

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Transconductance of FET Formula

Transconductance of FET Example

Transconductance of FET Solution

Transconductance of FET Formula Elements

Other formulas in FET category

How to Evaluate Transconductance of FET?

FAQs on Transconductance of FET

Variable Name