Critical Frequency in High Frequency Input RC Circuit Calculator

✖Input Resistance is the opposition to current flow in an electrical circuit. It is measured in ohms (Ω). The higher the resistance, the more opposition there is to current flow.ⓘ Input Resistance [R_in]			+10% -10%
✖Miller Capacitance is the equivalent input capacitance of a MOSFET amplifier due to the Miller effect.ⓘ Miller Capacitance [C_in]			+10% -10%

✖Corner Frequency of a circuit is the frequency at which the gain of the circuit begins to decrease significantly.ⓘ Critical Frequency in High Frequency Input RC Circuit [f_c]

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Critical Frequency in High Frequency Input RC Circuit

Formula

`"f"_{"c"} = 1/(2*pi*"R"_{"in"}*"C"_{"in"})`

Example

`"110.8321Hz"=1/(2*pi*"200Ω"*"7.18μF")`

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Critical Frequency in High Frequency Input RC Circuit Solution

STEP 0: Pre-Calculation Summary

Formula Used

Corner Frequency = 1/(2*pi*Input Resistance*Miller Capacitance)
f_c = 1/(2*pi*R_in*C_in)
This formula uses 1 Constants, 3 Variables

Constants Used

pi - Archimedes' constant Value Taken As 3.14159265358979323846264338327950288

Variables Used

Corner Frequency - (Measured in Hertz) - Corner Frequency of a circuit is the frequency at which the gain of the circuit begins to decrease significantly.
Input Resistance - (Measured in Ohm) - Input Resistance is the opposition to current flow in an electrical circuit. It is measured in ohms (Ω). The higher the resistance, the more opposition there is to current flow.
Miller Capacitance - (Measured in Farad) - Miller Capacitance is the equivalent input capacitance of a MOSFET amplifier due to the Miller effect.

STEP 1: Convert Input(s) to Base Unit

Input Resistance: 200 Ohm --> 200 Ohm No Conversion Required
Miller Capacitance: 7.18 Microfarad --> 7.18E-06 Farad (Check conversion here)

STEP 2: Evaluate Formula

Substituting Input Values in Formula

f_c = 1/(2*pi*R_in*C_in) --> 1/(2*pi*200*7.18E-06)

Evaluating ... ...

f_c = 110.832133072351

STEP 3: Convert Result to Output's Unit

110.832133072351 Hertz --> No Conversion Required

FINAL ANSWER

110.832133072351 ≈ 110.8321 Hertz <-- Corner Frequency

(Calculation completed in 00.004 seconds)

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Home » Engineering » Electronics » MOSFET » Analog Electronics » Internal Capacitive Effects and High Frequency Model » Critical Frequency in High Frequency Input RC Circuit

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Created by Suma Madhuri

VIT University (VIT), Chennai

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< 15 Internal Capacitive Effects and High Frequency Model Calculators

Conductance of Channel of MOSFETs

Go Conductance of Channel = Mobility of Electrons at Surface of Channel*Oxide Capacitance*(Channel Width/Channel Length)*Voltage across Oxide

Transition Frequency of MOSFET

Go Transition Frequency = Transconductance/(2*pi*(Source Gate Capacitance+Gate-Drain Capacitance))

Magnitude of Electron Charge in Channel of MOSFET

Go Electron Charge in Channel = Oxide Capacitance*Channel Width*Channel Length*Effective Voltage

Lower Critical Frequency of Mosfet

Go Corner Frequency = 1/(2*pi*(Resistance+Input Resistance)*Capacitance)

Phase Shift in Output RC Circuit

Go Phase Shift = arctan(Capacitive Reactance/(Resistance+Load Resistance))

Output Miller Capacitance Mosfet

Go Output Miller Capacitance = Gate-Drain Capacitance*((Voltage Gain+1)/Voltage Gain)

Total Capacitance between Gate and Channel of MOSFETs

Go Gate Channel Capacitance = Oxide Capacitance*Channel Width*Channel Length

Gate to Source Channel Width of MOSFET

Go Channel Width = Overlap Capacitance/(Oxide Capacitance*Overlap Length)

Overlap Capacitance of MOSFET

Go Overlap Capacitance = Channel Width*Oxide Capacitance*Overlap Length

Critical Frequency in High Frequency Input RC Circuit

Go Corner Frequency = 1/(2*pi*Input Resistance*Miller Capacitance)

Phase Shift in Input RC Circuit

Go Phase Shift = arctan(Capacitive Reactance/Input Resistance)

Capacitive Reactance of Mosfet

Go Capacitive Reactance = 1/(2*pi*Frequency*Capacitance)

Critical Frequency of Mosfet

Go Critical Frequency in decibles = 10*log10(Critical Frequency)

Miller Capacitance of Mosfet

Go Miller Capacitance = Gate-Drain Capacitance*(Voltage Gain+1)

Attenuation of RC Circuit

Go Attenuation = Base Voltage/Input Voltage

Critical Frequency in High Frequency Input RC Circuit Formula

Corner Frequency = 1/(2*pi*Input Resistance*Miller Capacitance)
f_c = 1/(2*pi*R_in*C_in)

How can the critical frequency in a high-frequency input RC circuit be increased?

There are two ways to increase the critical frequency in a high-frequency input RC circuit:

Decrease the resistance. The critical frequency is inversely proportional to the resistance, so decreasing the resistance will increase the critical frequency.
Decrease the capacitance. The critical frequency is also inversely proportional to the capacitance, so decreasing the capacitance will increase the critical frequency.

How to Calculate Critical Frequency in High Frequency Input RC Circuit?

Critical Frequency in High Frequency Input RC Circuit calculator uses Corner Frequency = 1/(2*pi*Input Resistance*Miller Capacitance) to calculate the Corner Frequency, The Critical Frequency in High Frequency Input Rc Circuit formula is defined as it determines the upper frequency limit of the RC circuit. Above the critical frequency, the output voltage will start to decrease. This is because the capacitor has less time to charge and discharge at higher frequencies. Corner Frequency is denoted by f_c symbol.

How to calculate Critical Frequency in High Frequency Input RC Circuit using this online calculator? To use this online calculator for Critical Frequency in High Frequency Input RC Circuit, enter Input Resistance (R_in) & Miller Capacitance (C_in) and hit the calculate button. Here is how the Critical Frequency in High Frequency Input RC Circuit calculation can be explained with given input values -> 110.8321 = 1/(2*pi*200*7.18E-06).

FAQ

What is Critical Frequency in High Frequency Input RC Circuit?

The Critical Frequency in High Frequency Input Rc Circuit formula is defined as it determines the upper frequency limit of the RC circuit. Above the critical frequency, the output voltage will start to decrease. This is because the capacitor has less time to charge and discharge at higher frequencies and is represented as f_c = 1/(2*pi*R_in*C_in) or Corner Frequency = 1/(2*pi*Input Resistance*Miller Capacitance). Input Resistance is the opposition to current flow in an electrical circuit. It is measured in ohms (Ω). The higher the resistance, the more opposition there is to current flow & Miller Capacitance is the equivalent input capacitance of a MOSFET amplifier due to the Miller effect.

How to calculate Critical Frequency in High Frequency Input RC Circuit?

The Critical Frequency in High Frequency Input Rc Circuit formula is defined as it determines the upper frequency limit of the RC circuit. Above the critical frequency, the output voltage will start to decrease. This is because the capacitor has less time to charge and discharge at higher frequencies is calculated using Corner Frequency = 1/(2*pi*Input Resistance*Miller Capacitance). To calculate Critical Frequency in High Frequency Input RC Circuit, you need Input Resistance (R_in) & Miller Capacitance (C_in). With our tool, you need to enter the respective value for Input Resistance & Miller Capacitance 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 Corner Frequency?

In this formula, Corner Frequency uses Input Resistance & Miller Capacitance. We can use 1 other way(s) to calculate the same, which is/are as follows -

Corner Frequency = 1/(2*pi*(Resistance+Input Resistance)*Capacitance)

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