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Source Resistance Formula

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Source Resistance is a measure of how much this source opposes the load from drawing current from it. Check FAQs

R s = (\frac{R d \cdot {f co}^{2}}{4 \cdot {f m}^{2}}) - (R g + R i)

R_s - Source Resistance?R_d - Drain Resistance?f_co - Cut-off Frequency?f_m - Maximum Frequency of Oscillations?R_g - Gate Metallization Resistance?R_i - Input Resistance?

Source Resistance Example

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Here is how the Source Resistance equation looks like with Values.

Here is how the Source Resistance equation looks like with Units.

Here is how the Source Resistance equation looks like.

5.7444 = (\frac{450 \cdot {30.05}^{2}}{4 \cdot 65^{2}}) - (2.8 + 15.5)

5.7444Ω = (\frac{450Ω \cdot {30.05Hz}^{2}}{4 \cdot {65Hz}^{2}}) - (2.8Ω + 15.5Ω)

5.7444 = (\frac{450 \cdot {30.05}^{2}}{4 \cdot 65^{2}}) - (2.8 + 15.5)

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Source Resistance Solution

Follow our step by step solution on how to calculate Source Resistance?

FIRST Step Consider the formula

R s = (\frac{R d \cdot {f co}^{2}}{4 \cdot {f m}^{2}}) - (R g + R i)

Next Step Substitute values of Variables

∴

R s = (\frac{450Ω \cdot {30.05Hz}^{2}}{4 \cdot {65Hz}^{2}}) - (2.8Ω + 15.5Ω)

Next Step Prepare to Evaluate

∴

R s = (\frac{450 \cdot {30.05}^{2}}{4 \cdot 65^{2}}) - (2.8 + 15.5)

Next Step Evaluate

∴

R s = 5.74444526627219Ω

LAST Step Rounding Answer

∴

R s = 5.7444Ω

Source Resistance Formula Elements

Variables

Source Resistance

Source Resistance is a measure of how much this source opposes the load from drawing current from it.

Symbol: R_s

Measurement: Electric ResistanceUnit: Ω

Note: Value should be greater than 0.

Formulas to find Source Resistance

Drain Resistance

Drain Resistance is the ratio of change in drain to source voltage to corresponding change in drain current for a constant gate to source voltage.

Symbol: R_d

Measurement: Electric ResistanceUnit: Ω

Note: Value should be greater than 0.

Formulas to find Drain Resistance

Cut-off Frequency

Cut-off Frequency is defined as corner frequency is a boundary in system's frequency response at which energy flowing through system begins to be reduced rather than passing through.

Symbol: f_co

Measurement: FrequencyUnit: Hz

Note: Value should be greater than 0.

Formulas to find Cut-off Frequency

Maximum Frequency of Oscillations

Maximum Frequency of Oscillations is defined as the practical upper bound for useful circuit operation with MESFET.

Symbol: f_m

Measurement: FrequencyUnit: Hz

Note: Value should be greater than 0.

Formulas to find Maximum Frequency of Oscillations

Gate Metallization Resistance

Gate Metallization Resistance is defined as the resistance of metallization of a FET gate stripe that has effect of placing a non-linear resistance in series with the gate junction.

Symbol: R_g

Measurement: Electric ResistanceUnit: Ω

Note: Value should be greater than 0.

Formulas to find Gate Metallization Resistance

Input Resistance

Input Resistance is defined as the total internal resistance as experienced by MESFET.

Symbol: R_i

Measurement: Electric ResistanceUnit: Ω

Note: Value should be greater than 0.

Formulas to find Input Resistance

Other formulas in MESFET Characteristics category

Go Gate Length of MESFET

L gate = \frac{V s}{4 \cdot π \cdot f co}

Go Cut-off Frequency

f co = \frac{V s}{4 \cdot π \cdot L gate}

Go Transconductance in MESFET

g m = 2 \cdot C gs \cdot π \cdot f co

Go Gate Source Capacitance

C gs = \frac{g m}{2 \cdot π \cdot f co}

How to Evaluate Source Resistance?

Source Resistance evaluator uses Source Resistance = ((Drain Resistance*Cut-off Frequency^2)/(4*Maximum Frequency of Oscillations^2))-(Gate Metallization Resistance+Input Resistance) to evaluate the Source Resistance, The Source Resistance formula is defined as a purely resistive device can be experimentally determined by increasingly loading the device. Source Resistance is denoted by R_s symbol.

How to evaluate Source Resistance using this online evaluator? To use this online evaluator for Source Resistance, enter Drain Resistance (R_d), Cut-off Frequency (f_co), Maximum Frequency of Oscillations (f_m), Gate Metallization Resistance (R_g) & Input Resistance (R_i) and hit the calculate button.

FAQs on Source Resistance

What is the formula to find Source Resistance?

The formula of Source Resistance is expressed as Source Resistance = ((Drain Resistance*Cut-off Frequency^2)/(4*Maximum Frequency of Oscillations^2))-(Gate Metallization Resistance+Input Resistance). Here is an example- 5.744445 = ((450*30.05^2)/(4*65^2))-(2.8+15.5).

How to calculate Source Resistance?

With Drain Resistance (R_d), Cut-off Frequency (f_co), Maximum Frequency of Oscillations (f_m), Gate Metallization Resistance (R_g) & Input Resistance (R_i) we can find Source Resistance using the formula - Source Resistance = ((Drain Resistance*Cut-off Frequency^2)/(4*Maximum Frequency of Oscillations^2))-(Gate Metallization Resistance+Input Resistance).

Can the Source Resistance be negative?

No, the Source Resistance, measured in Electric Resistance cannot be negative.

Which unit is used to measure Source Resistance?

Source Resistance is usually measured using the Ohm[Ω] for Electric Resistance. Megohm[Ω], Microhm[Ω], Volt per Ampere[Ω] are the few other units in which Source Resistance can be measured.

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Source Resistance Formula

Source Resistance Example

Source Resistance Solution

Source Resistance Formula Elements

Other formulas in MESFET Characteristics category

How to Evaluate Source Resistance?

FAQs on Source Resistance

Variable Name