Common-Mode Input Signal of MOSFET Calculator

✖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.ⓘ Total Current [I_t]			+10% -10%
✖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.ⓘ Transconductance [g_m]			+10% -10%
✖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.ⓘ Total Load Resistance of MOSFET [R_tl]			+10% -10%

✖A common mode input signal is a type of electrical signal that appears equally on both input terminals of a differential amplifier.ⓘ Common-Mode Input Signal of MOSFET [V_cin]

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Formula

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Common-Mode Input Signal of MOSFET

Formula

`"V"_{"cin"} = ("I"_{"t"}/"g"_{"m"})+(2*"I"_{"t"}*"R"_{"tl"})`

Example

`"135.52V"=("7.7mA"/"0.5mS")+(2*"7.7mA"*"7.8kΩ")`

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Common-Mode Input Signal of MOSFET Solution

STEP 0: Pre-Calculation Summary

Formula Used

Common Mode Input Signal = (Total Current/Transconductance)+(2*Total Current*Total Load Resistance of MOSFET)
V_cin = (I_t/g_m)+(2*I_t*R_tl)
This formula uses 4 Variables

Variables Used

Common Mode Input Signal - (Measured in Volt) - A common mode input signal is a type of electrical signal that appears equally on both input terminals of a differential amplifier.
Total Current - (Measured in Ampere) - 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.
Transconductance - (Measured in Siemens) - 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.
Total Load Resistance of MOSFET - (Measured in Ohm) - 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.

STEP 1: Convert Input(s) to Base Unit

Total Current: 7.7 Milliampere --> 0.0077 Ampere (Check conversion here)
Transconductance: 0.5 Millisiemens --> 0.0005 Siemens (Check conversion here)
Total Load Resistance of MOSFET: 7.8 Kilohm --> 7800 Ohm (Check conversion here)

STEP 2: Evaluate Formula

Substituting Input Values in Formula

V_cin = (I_t/g_m)+(2*I_t*R_tl) --> (0.0077/0.0005)+(2*0.0077*7800)

Evaluating ... ...

V_cin = 135.52

STEP 3: Convert Result to Output's Unit

135.52 Volt --> No Conversion Required

FINAL ANSWER

135.52 Volt <-- Common Mode Input Signal

(Calculation completed in 00.004 seconds)

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Birsa Institute of Technology (BIT), Sindri

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< 10+ Common Mode Rejection Ratio (CMRR) Calculators

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

Go Common Mode Rejection Ratio = Transconductance*(1/(1/Primary Winding Resistance in Secondary+1/Secondary Winding Resistance in Primary))*(2*Change in Transconductance*Finite Output Resistance)

Common-Mode Rejection Ratio of MOSFET when Transconductance Mismatches

Go Common Mode Rejection Ratio = (2*Transconductance*Output Resistance)/(Change in Transconductance/Transconductance)

Common-Mode Rejection Ratio of MOSFET given Resistance

Go Common Mode Rejection Ratio = (2*Transconductance*Output Resistance)/(Change in Drain Resistance/Drain Resistance)

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

Go Common Mode Rejection Ratio = (Transconductance*Finite Output Resistance)*(Transconductance*Source Resistance)

Common-Mode Input Signal of MOSFET

Go Common Mode Input Signal = (Total Current/Transconductance)+(2*Total Current*Total Load Resistance of MOSFET)

Common-Mode Rejection Ratio of MOS Controlled Source Transistor

Go Common Mode Rejection Ratio in DB = (modulus(Differential Gain DB))/(modulus(Common Mode Gain DB))

Common-Mode Rejection Ratio of MOSFET in Decibels

Go Common Mode Rejection Ratio in DB = modulus(20*log10((Voltage Gain)/(Common Mode Gain DB)))

Common-Mode Signal of MOSFET given Output Voltage at Drain Q2

Go Drain Voltage Q1 = (2*Output Resistance*Common Mode Input Signal)/Drain Resistance

Common-Mode Signal of MOSFET given Resistance

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

Common-Mode Rejection Ratio of MOSFET

Go Common Mode Rejection Ratio = modulus((Voltage Gain)/(Common Mode Gain))

Common-Mode Input Signal of MOSFET Formula

Common Mode Input Signal = (Total Current/Transconductance)+(2*Total Current*Total Load Resistance of MOSFET)
V_cin = (I_t/g_m)+(2*I_t*R_tl)

What is meant by differential input signals in a MOS differential amplifier?

Differential amplifiers apply gain not to one input signal but to the difference between two input signals. This means that a differential amplifier naturally eliminates noise or interference that is present in both input signals.

How to Calculate Common-Mode Input Signal of MOSFET?

Common-Mode Input Signal of MOSFET calculator uses Common Mode Input Signal = (Total Current/Transconductance)+(2*Total Current*Total Load Resistance of MOSFET) to calculate 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 calculate Common-Mode Input Signal of MOSFET using this online calculator? To use this online calculator 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. Here is how the Common-Mode Input Signal of MOSFET calculation can be explained with given input values -> 135.52 = (0.0077/0.0005)+(2*0.0077*7800).

FAQ

What is Common-Mode Input Signal of MOSFET?

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 and is represented as V_cin = (I_t/g_m)+(2*I_t*R_tl) or Common Mode Input Signal = (Total Current/Transconductance)+(2*Total Current*Total Load Resistance of MOSFET). 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, 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 & 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.

How to calculate Common-Mode Input Signal of MOSFET?

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 is calculated using Common Mode Input Signal = (Total Current/Transconductance)+(2*Total Current*Total Load Resistance of MOSFET). To calculate Common-Mode Input Signal of MOSFET, you need Total Current (I_t), Transconductance (g_m) & Total Load Resistance of MOSFET (R_tl). With our tool, you need to enter the respective value for Total Current, Transconductance & Total Load Resistance of MOSFET and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

How many ways are there to calculate Common Mode Input Signal?

In this formula, Common Mode Input Signal uses Total Current, Transconductance & Total Load Resistance of MOSFET. We can use 1 other way(s) to calculate the same, which is/are as follows -

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

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