Transconductance of FET Calculator

✖Zero Bias Drain Current in a FET is the drain current that flows when the gate voltage is equal to zero.ⓘ Zero Bias Drain Current [I_dss(fet)]			+10% -10%
✖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.ⓘ Pinch OFF Voltage [V_off(fet)]			+10% -10%
✖Drain Source Voltage FET is the voltage between the drain and the source terminal of an FET.ⓘ Drain Source Voltage FET [V_ds(fet)]			+10% -10%

✖Forward Transconductance FET refers to the change in output current resulting from a change in input voltage, indicating the device's amplification capability.ⓘ Transconductance of FET [G_m(fet)]

⎘ Copy

👎

Formula

✖

Transconductance of FET

Formula

`"G"_{"m(fet)"} = (2*"I"_{"dss(fet)"})/"V"_{"off(fet)"}*(1-"V"_{"ds(fet)"}/"V"_{"off(fet)"})`

Example

`"0.020072mS"=(2*"0.69mA")/"63.56V"*(1-"4.8V"/"63.56V")`

Calculator

LaTeX

Reset

👍

Download Advanced Transistor Devices Formulas PDF PDF Image

Transconductance of FET Solution

STEP 0: Pre-Calculation Summary

Formula Used

Forward Transconductance FET = (2*Zero Bias Drain Current)/Pinch OFF Voltage*(1-Drain Source Voltage FET/Pinch OFF Voltage)
G_m(fet) = (2*I_dss(fet))/V_off(fet)*(1-V_ds(fet)/V_off(fet))
This formula uses 4 Variables

Variables Used

Forward Transconductance FET - (Measured in Siemens) - Forward Transconductance FET refers to the change in output current resulting from a change in input voltage, indicating the device's amplification capability.
Zero Bias Drain Current - (Measured in Ampere) - Zero Bias Drain Current in a FET is the drain current that flows when the gate voltage is equal to zero.
Pinch OFF Voltage - (Measured in Volt) - 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.
Drain Source Voltage FET - (Measured in Volt) - Drain Source Voltage FET is the voltage between the drain and the source terminal of an FET.

STEP 1: Convert Input(s) to Base Unit

Zero Bias Drain Current: 0.69 Milliampere --> 0.00069 Ampere (Check conversion here)
Pinch OFF Voltage: 63.56 Volt --> 63.56 Volt No Conversion Required
Drain Source Voltage FET: 4.8 Volt --> 4.8 Volt No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

G_m(fet) = (2*I_dss(fet))/V_off(fet)*(1-V_ds(fet)/V_off(fet)) --> (2*0.00069)/63.56*(1-4.8/63.56)

Evaluating ... ...

G_m(fet) = 2.00721131473024E-05

STEP 3: Convert Result to Output's Unit

2.00721131473024E-05 Siemens -->0.0200721131473024 Millisiemens (Check conversion here)

FINAL ANSWER

0.0200721131473024 ≈ 0.020072 Millisiemens <-- Forward Transconductance FET

(Calculation completed in 00.020 seconds)

You are here -

Home » Engineering » Electrical » Power Electronics » Advanced Transistor Devices » FET » Transconductance of FET

Credits

Created by Mohamed Fazil V

Acharya institute of technology (AIT), Bengaluru

Mohamed Fazil V has created this Calculator and 50+ more calculators!

Verified by Parminder Singh

Chandigarh University (CU), Punjab

Parminder Singh has verified this Calculator and 500+ more calculators!

< 8 FET Calculators

Ohmic Region Drain Current of FET

Go Drain Current FET = Channel Conductance FET*(Drain Source Voltage FET+3/2*((Surface Potential FET+Drain Source Voltage FET-Drain Source Voltage FET)^(3/2)-(Surface Potential FET+Drain Source Voltage FET)^(3/2))/((Surface Potential FET+Pinch OFF Voltage)^(1/2)))

Transconductance of FET

Go Forward Transconductance FET = (2*Zero Bias Drain Current)/Pinch OFF Voltage*(1-Drain Source Voltage FET/Pinch OFF Voltage)

Drain Source Voltage of FET

Go Drain Source Voltage FET = Supply Voltage at Drain FET-Drain Current FET*(Drain Resistance FET+Source Resistance FET)

Gate Source Capacitance of FET

Go Gate Source Capacitance FET = Gate Source Capacitance Off Time FET/(1-(Drain Source Voltage FET/Surface Potential FET))^(1/3)

Gate Drain Capacitance of FET

Go Gate Drain Capacitance FET = Gate Drain Capacitance Off Time FET/(1-Gate to Drain Voltage FET/Surface Potential FET)^(1/3)

Drain Current of FET

Go Drain Current FET = Zero Bias Drain Current*(1-Drain Source Voltage FET/Cutt-off Voltage FET)^2

Pinch off Voltage of FET

Go Pinch OFF Voltage = Pinch OFF Drain Source Voltage FET-Drain Source Voltage FET

Voltage Gain of FET

Go Voltage Gain FET = -Forward Transconductance FET*Drain Resistance FET

Transconductance of FET Formula

Forward Transconductance FET = (2*Zero Bias Drain Current)/Pinch OFF Voltage*(1-Drain Source Voltage FET/Pinch OFF Voltage)
G_m(fet) = (2*I_dss(fet))/V_off(fet)*(1-V_ds(fet)/V_off(fet))

What is Transconductance of FET ?

Transconductance, often denoted as "gm," is a key parameter in field-effect transistors (FETs) and is analogous to the gain parameter in bipolar junction transistors (BJTs). It measures the relationship between the input voltage and the output current in a FET. More specifically, it quantifies how a change in the gate-source voltage (V_gs) of the FET results in a change in the drain current (I_d ).

How to Calculate Transconductance of FET?

Transconductance of FET calculator uses Forward Transconductance FET = (2*Zero Bias Drain Current)/Pinch OFF Voltage*(1-Drain Source Voltage FET/Pinch OFF Voltage) to calculate 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 calculate Transconductance of FET using this online calculator? To use this online calculator 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. Here is how the Transconductance of FET calculation can be explained with given input values -> 21.70678 = (2*0.00069)/63.56*(1-4.8/63.56).

FAQ

What is Transconductance of 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 and is represented as G_m(fet) = (2*I_dss(fet))/V_off(fet)*(1-V_ds(fet)/V_off(fet)) or Forward Transconductance FET = (2*Zero Bias Drain Current)/Pinch OFF Voltage*(1-Drain Source Voltage FET/Pinch OFF Voltage). Zero Bias Drain Current in a FET is the drain current that flows when the gate voltage is equal to zero, 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 & Drain Source Voltage FET is the voltage between the drain and the source terminal of an FET.

How to calculate Transconductance of 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 is calculated using Forward Transconductance FET = (2*Zero Bias Drain Current)/Pinch OFF Voltage*(1-Drain Source Voltage FET/Pinch OFF Voltage). To calculate Transconductance of FET, you need Zero Bias Drain Current (I_dss(fet)), Pinch OFF Voltage (V_off(fet)) & Drain Source Voltage FET (V_ds(fet)). With our tool, you need to enter the respective value for Zero Bias Drain Current, Pinch OFF Voltage & Drain Source Voltage FET and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

Home

FREE PDFs

🔍 Search