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Common-Mode Input Signal of MOSFET Formula

GoCommon-Mode Signal of MOSFET given Resistance Formula

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A common mode input signal is a type of electrical signal that appears equally on both input terminals of a differential amplifier. Check FAQs

V cin = (\frac{I t}{g m}) + (2 \cdot I t \cdot R tl)

V_cin - Common Mode Input Signal?I_t - Total Current?g_m - Transconductance?R_tl - Total Load Resistance of MOSFET?

Common-Mode Input Signal of MOSFET Example

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Here is how the Common-Mode Input Signal of MOSFET equation looks like with Values.

Here is how the Common-Mode Input Signal of MOSFET equation looks like with Units.

Here is how the Common-Mode Input Signal of MOSFET equation looks like.

135.52 = (\frac{7.7}{0.5}) + (2 \cdot 7.7 \cdot 7.8)

135.52V = (\frac{7.7mA}{0.5mS}) + (2 \cdot 7.7mA \cdot 7.8kΩ)

135.52 = (\frac{7.7}{0.5}) + (2 \cdot 7.7 \cdot 7.8)

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Home » Engineering » Electronics » Analog Electronics » Common-Mode Input Signal of MOSFET

Common-Mode Input Signal of MOSFET Solution

Follow our step by step solution on how to calculate Common-Mode Input Signal of MOSFET?

FIRST Step Consider the formula

V cin = (\frac{I t}{g m}) + (2 \cdot I t \cdot R tl)

Next Step Substitute values of Variables

∴

V cin = (\frac{7.7mA}{0.5mS}) + (2 \cdot 7.7mA \cdot 7.8kΩ)

Next Step Convert Units

∴

V cin = (\frac{0.0077A}{0.0005S}) + (2 \cdot 0.0077A \cdot 7800Ω)

Next Step Prepare to Evaluate

∴

V cin = (\frac{0.0077}{0.0005}) + (2 \cdot 0.0077 \cdot 7800)

LAST Step Evaluate

∴

V cin = 135.52V

Common-Mode Input Signal of MOSFET Formula Elements

Variables

Common Mode Input Signal

A common mode input signal is a type of electrical signal that appears equally on both input terminals of a differential amplifier.

Symbol: V_cin

Measurement: Electric PotentialUnit: V

Note: Value can be positive or negative.

Total Current

Total current is a term used in electrical engineering and physics to refer to the sum of all the electric currents flowing through a particular point in a circuit or conductor.

Symbol: I_t

Measurement: Electric CurrentUnit: mA

Note: Value can be positive or negative.

Transconductance

Transconductance is defined as the ratio of the change in the output current to the change in the input voltage, with the gate-source voltage held constant.

Symbol: g_m

Measurement: Electric ConductanceUnit: mS

Note: Value can be positive or negative.

Total Load Resistance of MOSFET

Total load resistance of MOSFET includes both the intrinsic drain-source resistance of the MOSFET and the external load resistance that is connected to the drain terminal.

Symbol: R_tl

Measurement: Electric ResistanceUnit: kΩ

Note: Value can be positive or negative.

Credits

Created by Payal Priya

Birsa Institute of Technology (BIT), Sindri

Payal Priya has created this Formula and 600+ more formulas!

Verified by Urvi Rathod

Vishwakarma Government Engineering College (VGEC), Ahmedabad

Urvi Rathod has verified this Formula and 1900+ more formulas!

Other Formulas to find Common Mode Input Signal

Go Common-Mode Signal of MOSFET given Resistance

V cin = \frac{2 \cdot R out \cdot V out}{R L}

Other formulas in Common Mode Rejection Ratio (CMRR) category

Go Common-Mode Rejection Ratio of MOSFET given Resistance

CMRR = \frac{2 \cdot g m \cdot R out}{\frac{ΔR D}{R d}}

Go Common-Mode Rejection Ratio of MOS with Current-Mirror Load

CMRR = g m \cdot (\frac{1}{\frac{1}{R' 1} + \frac{1}{R' 2}}) \cdot (2 \cdot Δg m \cdot R fo)

Go Common-Mode Rejection Ratio of MOS with Current-Mirror Load when Resistance at Drains are Equal

CMRR = (g m \cdot R fo) \cdot (g m \cdot R s)

Go Common-Mode Rejection Ratio of MOSFET in Decibels

CMRR db = mod \underset{̲}{u} s (20 \cdot \log 10 (\frac{A v}{A cm(db)}))

How to Evaluate Common-Mode Input Signal of MOSFET?

Common-Mode Input Signal of MOSFET evaluator uses Common Mode Input Signal = (Total Current/Transconductance)+(2*Total Current*Total Load Resistance of MOSFET) to evaluate the Common Mode Input Signal, The Common-mode input signal of MOSFET formula is defined as the average voltage which is applied to the two inputs of an amplifier. In the case of an op-amp, the two inputs are at the practically same potential, with only a small offset between them. So, effectively you can see the common-mode voltage on either input. Common Mode Input Signal is denoted by V_cin symbol.

How to evaluate Common-Mode Input Signal of MOSFET using this online evaluator? To use this online evaluator for Common-Mode Input Signal of MOSFET, enter Total Current (I_t), Transconductance (g_m) & Total Load Resistance of MOSFET (R_tl) and hit the calculate button.

FAQs on Common-Mode Input Signal of MOSFET

What is the formula to find Common-Mode Input Signal of MOSFET?

The formula of Common-Mode Input Signal of MOSFET is expressed as Common Mode Input Signal = (Total Current/Transconductance)+(2*Total Current*Total Load Resistance of MOSFET). Here is an example- 135.52 = (0.0077/0.0005)+(2*0.0077*7800).

How to calculate Common-Mode Input Signal of MOSFET?

With Total Current (I_t), Transconductance (g_m) & Total Load Resistance of MOSFET (R_tl) we can find Common-Mode Input Signal of MOSFET using the formula - Common Mode Input Signal = (Total Current/Transconductance)+(2*Total Current*Total Load Resistance of MOSFET).

What are the other ways to Calculate Common Mode Input Signal?

Here are the different ways to Calculate Common Mode Input Signal-

Common Mode Input Signal=(2*Output Resistance*Output Voltage)/Load Resistance

Can the Common-Mode Input Signal of MOSFET be negative?

Yes, the Common-Mode Input Signal of MOSFET, measured in Electric Potential can be negative.

Which unit is used to measure Common-Mode Input Signal of MOSFET?

Common-Mode Input Signal of MOSFET is usually measured using the Volt[V] for Electric Potential. Millivolt[V], Microvolt[V], Nanovolt[V] are the few other units in which Common-Mode Input Signal of MOSFET can be measured.