Output Impedance of Low Noise Amplifier Calculator

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Low Noise Amplifier

✖Feedback Resistance is a resistance that is connected between the output of the amplifier and the input of the amplifier.ⓘ Feedback Resistance [R_f]			+10% -10%
✖Source Impedance is the opposition to current flow that the source presents to the load.ⓘ Source Impedance [R_s]			+10% -10%

✖Output Impedance is a measure of the opposition to current flow that an electrical source presents to its load.ⓘ Output Impedance of Low Noise Amplifier [R_out]

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Formula

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Output Impedance of Low Noise Amplifier

Formula

`"R"_{"out"} = (1/2)*("R"_{"f"}+"R"_{"s"})`

Example

`"29Ω"=(1/2)*("35Ω"+"23Ω")`

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Output Impedance of Low Noise Amplifier Solution

STEP 0: Pre-Calculation Summary

Formula Used

Output Impedance = (1/2)*(Feedback Resistance+Source Impedance)
R_out = (1/2)*(R_f+R_s)
This formula uses 3 Variables

Variables Used

Output Impedance - (Measured in Ohm) - Output Impedance is a measure of the opposition to current flow that an electrical source presents to its load.
Feedback Resistance - (Measured in Ohm) - Feedback Resistance is a resistance that is connected between the output of the amplifier and the input of the amplifier.
Source Impedance - (Measured in Ohm) - Source Impedance is the opposition to current flow that the source presents to the load.

STEP 1: Convert Input(s) to Base Unit

Feedback Resistance: 35 Ohm --> 35 Ohm No Conversion Required
Source Impedance: 23 Ohm --> 23 Ohm No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

R_out = (1/2)*(R_f+R_s) --> (1/2)*(35+23)

Evaluating ... ...

R_out = 29

STEP 3: Convert Result to Output's Unit

29 Ohm --> No Conversion Required

FINAL ANSWER

29 Ohm <-- Output Impedance

(Calculation completed in 00.020 seconds)

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Created by Suma Madhuri

VIT University (VIT), Chennai

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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

Output Impedance of Low Noise Amplifier Formula

Output Impedance = (1/2)*(Feedback Resistance+Source Impedance)
R_out = (1/2)*(R_f+R_s)

Why is the output impedance of an LNA important?

The output impedance of an LNA is important for several reasons:

It affects the power transfer between the amplifier and the load. A low output impedance means that more power is transferred to the load, while a high output impedance means that less power is transferred to the load.
It affects the frequency response of the amplifier. A high output impedance can cause reflections of signals, which can distort the signal and reduce the amplifier's bandwidth.
It affects the stability of the amplifier. A high output impedance can make the amplifier more susceptible to oscillation.

How to Calculate Output Impedance of Low Noise Amplifier?

Output Impedance of Low Noise Amplifier calculator uses Output Impedance = (1/2)*(Feedback Resistance+Source Impedance) to calculate the Output Impedance, The Output Impedance of Low Noise Amplifier formula is defined as a crucial parameter that determines how well the amplifier can transfer amplified signals to the load without introducing reflections or distortions. It is typically measured in ohms and is ideally low to minimize signal loss and ensure efficient signal transfer. Output Impedance is denoted by R_out symbol.

How to calculate Output Impedance of Low Noise Amplifier using this online calculator? To use this online calculator for Output Impedance of Low Noise Amplifier, enter Feedback Resistance (R_f) & Source Impedance (R_s) and hit the calculate button. Here is how the Output Impedance of Low Noise Amplifier calculation can be explained with given input values -> 29 = (1/2)*(35+23).

FAQ

What is Output Impedance of Low Noise Amplifier?

The Output Impedance of Low Noise Amplifier formula is defined as a crucial parameter that determines how well the amplifier can transfer amplified signals to the load without introducing reflections or distortions. It is typically measured in ohms and is ideally low to minimize signal loss and ensure efficient signal transfer and is represented as R_out = (1/2)*(R_f+R_s) or Output Impedance = (1/2)*(Feedback Resistance+Source Impedance). Feedback Resistance is a resistance that is connected between the output of the amplifier and the input of the amplifier & Source Impedance is the opposition to current flow that the source presents to the load.

How to calculate Output Impedance of Low Noise Amplifier?

The Output Impedance of Low Noise Amplifier formula is defined as a crucial parameter that determines how well the amplifier can transfer amplified signals to the load without introducing reflections or distortions. It is typically measured in ohms and is ideally low to minimize signal loss and ensure efficient signal transfer is calculated using Output Impedance = (1/2)*(Feedback Resistance+Source Impedance). To calculate Output Impedance of Low Noise Amplifier, you need Feedback Resistance (R_f) & Source Impedance (R_s). With our tool, you need to enter the respective value for Feedback Resistance & Source Impedance 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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