Threshold Voltage of Low Noise Amplifier Calculator

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Low Noise Amplifier

✖Gate to Source Voltage is the voltage applied between the gate and source terminals of a field-effect transistor.ⓘ Gate to Source Voltage [V_gs]			+10% -10%
✖Drain Current is the current flowing through the drain terminal of a field-effect transistor .ⓘ Drain Current [I_d]			+10% -10%
✖Transconductance is a measure of how much current the amplifier can produce for a given input voltage.ⓘ Transconductance [g_m]			+10% -10%

✖Threshold Voltage is the minimum gate-to-source voltage that is needed to create a conducting path between the source and drain terminals of a field-effect transistor.ⓘ Threshold Voltage of Low Noise Amplifier [V_th]

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Formula

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Threshold Voltage of Low Noise Amplifier

Formula

`"V"_{"th"} = "V"_{"gs"}-(2*"I"_{"d"})/("g"_{"m"})`

Example

`"32V"="43V"-(2*"11.99A")/("2.18S")`

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Threshold Voltage of Low Noise Amplifier Solution

STEP 0: Pre-Calculation Summary

Formula Used

Threshold Voltage = Gate to Source Voltage-(2*Drain Current)/(Transconductance)
V_th = V_gs-(2*I_d)/(g_m)
This formula uses 4 Variables

Variables Used

Threshold Voltage - (Measured in Volt) - Threshold Voltage is the minimum gate-to-source voltage that is needed to create a conducting path between the source and drain terminals of a field-effect transistor.
Gate to Source Voltage - (Measured in Volt) - Gate to Source Voltage is the voltage applied between the gate and source terminals of a field-effect transistor.
Drain Current - (Measured in Ampere) - Drain Current is the current flowing through the drain terminal of a field-effect transistor .
Transconductance - (Measured in Siemens) - Transconductance is a measure of how much current the amplifier can produce for a given input voltage.

STEP 1: Convert Input(s) to Base Unit

Gate to Source Voltage: 43 Volt --> 43 Volt No Conversion Required
Drain Current: 11.99 Ampere --> 11.99 Ampere No Conversion Required
Transconductance: 2.18 Siemens --> 2.18 Siemens No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

V_th = V_gs-(2*I_d)/(g_m) --> 43-(2*11.99)/(2.18)

Evaluating ... ...

V_th = 32

STEP 3: Convert Result to Output's Unit

32 Volt --> No Conversion Required

FINAL ANSWER

32 Volt <-- Threshold Voltage

(Calculation completed in 00.004 seconds)

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Created by Suma Madhuri

VIT University (VIT), Chennai

Suma Madhuri has created this Calculator and 50+ more calculators!

Verified by Parminder Singh

Chandigarh University (CU), Punjab

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< 18 RF Microelectronics Calculators

Energy Stored in all Unit Capacitances

Go Energy Stored in All Unit Capacitances = (1/2)*Value of Unit capacitance*(sum(x,1,Number of Inductors,((Value of Node N/Number of Inductors)^2)*((Input Voltage)^2)))

Equivalent Capacitance for n Stacked Spirals

Go Equivalent Capacitance of N Stacked Spirals = 4*((sum(x,1,Number of Stacked Spirals-1,Inter Spiral Capacitance+Substrate Capacitance)))/(3*((Number of Stacked Spirals)^2))

Total Noise Power Introduced by Interferer

Go Total Noise Power of Interferer = int(Broadened Spectrum of Interferer*x,x,Lower End of the Desired Channel,Higher End of the Desired Channel)

Feedback Factor of Low Noise Amplifier

Go Feedback Factor = (Transconductance*Source Impedance-1)/(2*Transconductance*Source Impedance*Voltage Gain)

Return Loss of Low-Noise Amplifier

Go Return Loss = modulus((Input Impedance-Source Impedance)/(Input Impedance+Source Impedance))^2

Total Power Lost in Spiral

Go Total Power Lost in Spiral = sum(x,1,Number of Inductors,((Corresponding RC Branch Current)^2)*Substrate Resistance)

Noise Figure of Low Noise Amplifier

Go Noise Figure = 1+((4*Source Impedance)/Feedback Resistance)+Noise Factor of Transistor

Gate to Source Voltage of Low Noise Amplifier

Go Gate to Source Voltage = ((2*Drain Current)/(Transconductance))+Threshold Voltage

Threshold Voltage of Low Noise Amplifier

Go Threshold Voltage = Gate to Source Voltage-(2*Drain Current)/(Transconductance)

Transconductance of Low Noise Amplifier

Go Transconductance = (2*Drain Current)/(Gate to Source Voltage-Threshold Voltage)

Drain Current of Low Noise Amplifier

Go Drain Current = (Transconductance*(Gate to Source Voltage-Threshold Voltage))/2

Voltage Gain of Low Noise Amplifier given DC Voltage Drop

Go Voltage Gain = 2*DC Voltage Drop/(Gate to Source Voltage-Threshold Voltage)

Load Impedance of Low Noise Amplifier

Go Load Impedance = (Input Impedance-(1/Transconductance))/Feedback Factor

Input Impedance of Low Noise Amplifier

Go Input Impedance = (1/Transconductance)+Feedback Factor*Load Impedance

Output Impedance of Low Noise Amplifier

Go Output Impedance = (1/2)*(Feedback Resistance+Source Impedance)

Source Impedance of Low Noise Amplifier

Go Source Impedance = 2*Output Impedance-Feedback Resistance

Drain Resistance of Low Noise Amplifier

Go Drain Resistance = Voltage Gain/Transconductance

Voltage Gain of Low Noise Amplifier

Go Voltage Gain = Transconductance*Drain Resistance

Threshold Voltage of Low Noise Amplifier Formula

Threshold Voltage = Gate to Source Voltage-(2*Drain Current)/(Transconductance)
V_th = V_gs-(2*I_d)/(g_m)

What are some applications where threshold voltage control is important for LNAs?

Controlling the FET's operating point and compensating for variations in Vth is crucial for LNAs in various applications:

Radio astronomy: LNAs in radio astronomy applications require precise Vth control to minimize noise and maximize the sensitivity of the system for detecting weak astronomical signals.

Medical imaging: LNAs in medical imaging equipment, such as MRI scanners, need accurate operating point adjustment to ensure the integrity of the signals used for diagnostics and treatment.

How to Calculate Threshold Voltage of Low Noise Amplifier?

Threshold Voltage of Low Noise Amplifier calculator uses Threshold Voltage = Gate to Source Voltage-(2*Drain Current)/(Transconductance) to calculate the Threshold Voltage, The Threshold Voltage of Low Noise Amplifier formula is defined as a critical parameter that determines the transistor's ability to conduct current and significantly influences the amplifier's performance. Threshold Voltage is denoted by V_th symbol.

How to calculate Threshold Voltage of Low Noise Amplifier using this online calculator? To use this online calculator for Threshold Voltage of Low Noise Amplifier, enter Gate to Source Voltage (V_gs), Drain Current (I_d) & Transconductance (g_m) and hit the calculate button. Here is how the Threshold Voltage of Low Noise Amplifier calculation can be explained with given input values -> 31.74178 = 43-(2*11.99)/(2.18).

FAQ

What is Threshold Voltage of Low Noise Amplifier?

The Threshold Voltage of Low Noise Amplifier formula is defined as a critical parameter that determines the transistor's ability to conduct current and significantly influences the amplifier's performance and is represented as V_th = V_gs-(2*I_d)/(g_m) or Threshold Voltage = Gate to Source Voltage-(2*Drain Current)/(Transconductance). Gate to Source Voltage is the voltage applied between the gate and source terminals of a field-effect transistor, Drain Current is the current flowing through the drain terminal of a field-effect transistor & Transconductance is a measure of how much current the amplifier can produce for a given input voltage.

How to calculate Threshold Voltage of Low Noise Amplifier?

The Threshold Voltage of Low Noise Amplifier formula is defined as a critical parameter that determines the transistor's ability to conduct current and significantly influences the amplifier's performance is calculated using Threshold Voltage = Gate to Source Voltage-(2*Drain Current)/(Transconductance). To calculate Threshold Voltage of Low Noise Amplifier, you need Gate to Source Voltage (V_gs), Drain Current (I_d) & Transconductance (g_m). With our tool, you need to enter the respective value for Gate to Source Voltage, Drain Current & Transconductance and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

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