Constant 2 of Source Follower Transfer Function Calculator

✖Gate to Source Capacitance is defined as the capacitance that is observed between the gate and Source of the Junction of MOSFET.ⓘ Gate to Source Capacitance [C_gs]			+10% -10%
✖Gate to Drain Capacitance is defined as the capacitance that is observed between the gate and drain of the Junction of MOSFET.ⓘ Gate to Drain Capacitance [C_gd]			+10% -10%
✖Capacitance is the ratio of the amount of electric charge stored on a conductor to a difference in electric potential.ⓘ Capacitance [C_t]			+10% -10%
✖Transconductance is the ratio of the change in current at the output terminal to the change in the voltage at the input terminal of an active device.ⓘ Transconductance [g_m]			+10% -10%
✖Load resistance is the cumulative resistance of a circuit, as seen by the voltage, current, or power source driving that circuit.ⓘ Load Resistance [R_L]			+10% -10%
✖Signal Resistance is the resistance which is fed with the signal voltage source vs to an Amplifier.ⓘ Signal Resistance [R_sig]			+10% -10%

✖Constant B is one of the constant in Andrade's equation.ⓘ Constant 2 of Source Follower Transfer Function [b]

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Formula

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Constant 2 of Source Follower Transfer Function

Formula

`"b" = ((("C"_{"gs"}+"C"_{"gd"})*"C"_{"t"}+("C"_{"gs"}+"C"_{"gs"}))/("g"_{"m"}*"R"_{"L"}+1))*"R"_{"sig"}*"R"_{"L"}`

Example

`"1.188055"=((("2.6μF"+"1.345μF")*"2.889μF"+("2.6μF"+"2.6μF"))/("4.8mS"*"1.49kΩ"+1))*"1.25kΩ"*"1.49kΩ"`

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Download High Frequency Response Amplifiers Formula PDF

Constant 2 of Source Follower Transfer Function Solution

STEP 0: Pre-Calculation Summary

Formula Used

Constant B = (((Gate to Source Capacitance+Gate to Drain Capacitance)*Capacitance+(Gate to Source Capacitance+Gate to Source Capacitance))/(Transconductance*Load Resistance+1))*Signal Resistance*Load Resistance
b = (((C_gs+C_gd)*C_t+(C_gs+C_gs))/(g_m*R_L+1))*R_sig*R_L
This formula uses 7 Variables

Variables Used

Constant B - Constant B is one of the constant in Andrade's equation.
Gate to Source Capacitance - (Measured in Farad) - Gate to Source Capacitance is defined as the capacitance that is observed between the gate and Source of the Junction of MOSFET.
Gate to Drain Capacitance - (Measured in Farad) - Gate to Drain Capacitance is defined as the capacitance that is observed between the gate and drain of the Junction of MOSFET.
Capacitance - (Measured in Farad) - Capacitance is the ratio of the amount of electric charge stored on a conductor to a difference in electric potential.
Transconductance - (Measured in Siemens) - Transconductance is the ratio of the change in current at the output terminal to the change in the voltage at the input terminal of an active device.
Load Resistance - (Measured in Ohm) - Load resistance is the cumulative resistance of a circuit, as seen by the voltage, current, or power source driving that circuit.
Signal Resistance - (Measured in Ohm) - Signal Resistance is the resistance which is fed with the signal voltage source vs to an Amplifier.

STEP 1: Convert Input(s) to Base Unit

Gate to Source Capacitance: 2.6 Microfarad --> 2.6E-06 Farad (Check conversion here)
Gate to Drain Capacitance: 1.345 Microfarad --> 1.345E-06 Farad (Check conversion here)
Capacitance: 2.889 Microfarad --> 2.889E-06 Farad (Check conversion here)
Transconductance: 4.8 Millisiemens --> 0.0048 Siemens (Check conversion here)
Load Resistance: 1.49 Kilohm --> 1490 Ohm (Check conversion here)
Signal Resistance: 1.25 Kilohm --> 1250 Ohm (Check conversion here)

STEP 2: Evaluate Formula

Substituting Input Values in Formula

b = (((C_gs+C_gd)*C_t+(C_gs+C_gs))/(g_m*R_L+1))*R_sig*R_L --> (((2.6E-06+1.345E-06)*2.889E-06+(2.6E-06+2.6E-06))/(0.0048*1490+1))*1250*1490

Evaluating ... ...

b = 1.18805461569039

STEP 3: Convert Result to Output's Unit

1.18805461569039 --> No Conversion Required

FINAL ANSWER

1.18805461569039 ≈ 1.188055 <-- Constant B

(Calculation completed in 00.004 seconds)

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Home » Engineering » Electronics » Amplifiers » High Frequency Response Amplifiers » Response of Source and Emitter Follower » Constant 2 of Source Follower Transfer Function

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< 7 Response of Source and Emitter Follower Calculators

Constant 2 of Source Follower Transfer Function

Go Constant B = (((Gate to Source Capacitance+Gate to Drain Capacitance)*Capacitance+(Gate to Source Capacitance+Gate to Source Capacitance))/(Transconductance*Load Resistance+1))*Signal Resistance*Load Resistance

Signal Voltage in High Frequency Response of Source and Emitter Follower

Go Output Voltage = (Electric Current*Signal Resistance)+Gate to Source Voltage+Threshold Voltage

Transition Frequency of Source-Follower Transfer Function

Go Transition Frequency = Transconductance/Gate to Source Capacitance

Gate to Source Capacitance of Source Follower

Go Gate to Source Capacitance = Transconductance/Transition Frequency

Transconductance of Source-Follower

Go Transconductance = Transition Frequency*Gate to Source Capacitance

Dominant Pole-Frequency of Source-Follower

Go Frequency of Dominant Pole = 1/(2*pi*Constant B)

Break Frequency of Source Follower

Go Break Frequency = 1/sqrt(Constant C)

< 20 Multi Stage Amplifiers Calculators

Constant 2 of Source Follower Transfer Function

Gain Bandwidth Product

Go Gain Bandwidth Product = (Transconductance*Load Resistance)/(2*pi*Load Resistance*(Capacitance+Gate to Drain Capacitance))

3-DB Frequency in Design Insight and Trade-Off

Go 3 dB Frequency = 1/(2*pi*(Capacitance+Gate to Drain Capacitance)*(1/(1/Load Resistance+1/Output Resistance)))

Transconductance of CC-CB Amplifier

Go Transconductance = (2*Voltage Gain)/((Resistance/(Resistance+Signal Resistance))*Load Resistance)

Overall Voltage Gain of CC CB Amplifier

Go Voltage Gain = 1/2*(Resistance/(Resistance+Signal Resistance))*Load Resistance*Transconductance

Signal Voltage in High Frequency Response of Source and Emitter Follower

Go Output Voltage = (Electric Current*Signal Resistance)+Gate to Source Voltage+Threshold Voltage

Input Resistance of CC CB Amplifier

Go Resistance = (Common Emitter Current Gain+1)*(Emitter Resistance+Resistance of Secondary Winding in Primary)

Total Capacitance of CB-CG Amplifier

Go Capacitance = 1/(2*pi*Load Resistance*Output Pole Frequency)

Dominant Pole Frequency of Differential Amplifier

Go Pole Frequency = 1/(2*pi*Capacitance*Output Resistance)

Frequency of Differential Amplifier given Load Resistance

Go Frequency = 1/(2*pi*Load Resistance*Capacitance)

Short Circuit Transconductance of Differential Amplifier

Go Short Circuit Transconductance = Output Current/Differential Input Signal

Transition Frequency of Source-Follower Transfer Function

Go Transition Frequency = Transconductance/Gate to Source Capacitance

Gate to Source Capacitance of Source Follower

Go Gate to Source Capacitance = Transconductance/Transition Frequency

Transconductance of Source-Follower

Go Transconductance = Transition Frequency*Gate to Source Capacitance

Drain Resistance in Cascode Amplifier

Go Drain Resistance = 1/(1/Finite Input Resistance+1/Resistance)

Amplifier Gain given Function of Complex Frequency Variable

Go Amplifier Gain in Mid Band = Mid Band Gain*Gain Factor

Gain Factor

Go Gain Factor = Amplifier Gain in Mid Band/Mid Band Gain

Dominant Pole-Frequency of Source-Follower

Go Frequency of Dominant Pole = 1/(2*pi*Constant B)

Power Gain of Amplifier given Voltage Gain and Current Gain

Go Power Gain = Voltage Gain*Current Gain

Break Frequency of Source Follower

Go Break Frequency = 1/sqrt(Constant C)

Constant 2 of Source Follower Transfer Function Formula

What is the purpose of source follower?

An important aspect of the source follower is to provide power or current gain. That is to say drive a lower resistance (impedance) load from a higher resistance (impedance) stage. Thus it is instructive to measure the source follower output impedance.

How to Calculate Constant 2 of Source Follower Transfer Function?

Constant 2 of Source Follower Transfer Function calculator uses Constant B = (((Gate to Source Capacitance+Gate to Drain Capacitance)*Capacitance+(Gate to Source Capacitance+Gate to Source Capacitance))/(Transconductance*Load Resistance+1))*Signal Resistance*Load Resistance to calculate the Constant B, The Constant 2 of source follower transfer function formula, in electronics, a common-drain amplifier, also known as a source follower, is one of three basic single-stage field-effect transistor (FET) amplifier topologies, typically used as a voltage buffer. The analogous bipolar junction transistor circuit is the common-collector amplifier. Constant B is denoted by b symbol.

How to calculate Constant 2 of Source Follower Transfer Function using this online calculator? To use this online calculator for Constant 2 of Source Follower Transfer Function, enter Gate to Source Capacitance (C_gs), Gate to Drain Capacitance (C_gd), Capacitance (C_t), Transconductance (g_m), Load Resistance (R_L) & Signal Resistance (R_sig) and hit the calculate button. Here is how the Constant 2 of Source Follower Transfer Function calculation can be explained with given input values -> 1.188055 = (((2.6E-06+1.345E-06)*2.889E-06+(2.6E-06+2.6E-06))/(0.0048*1490+1))*1250*1490.

FAQ

What is Constant 2 of Source Follower Transfer Function?

The Constant 2 of source follower transfer function formula, in electronics, a common-drain amplifier, also known as a source follower, is one of three basic single-stage field-effect transistor (FET) amplifier topologies, typically used as a voltage buffer. The analogous bipolar junction transistor circuit is the common-collector amplifier and is represented as b = (((C_gs+C_gd)*C_t+(C_gs+C_gs))/(g_m*R_L+1))*R_sig*R_L or Constant B = (((Gate to Source Capacitance+Gate to Drain Capacitance)*Capacitance+(Gate to Source Capacitance+Gate to Source Capacitance))/(Transconductance*Load Resistance+1))*Signal Resistance*Load Resistance. Gate to Source Capacitance is defined as the capacitance that is observed between the gate and Source of the Junction of MOSFET, Gate to Drain Capacitance is defined as the capacitance that is observed between the gate and drain of the Junction of MOSFET, Capacitance is the ratio of the amount of electric charge stored on a conductor to a difference in electric potential, Transconductance is the ratio of the change in current at the output terminal to the change in the voltage at the input terminal of an active device, Load resistance is the cumulative resistance of a circuit, as seen by the voltage, current, or power source driving that circuit & Signal Resistance is the resistance which is fed with the signal voltage source vs to an Amplifier.

How to calculate Constant 2 of Source Follower Transfer Function?

The Constant 2 of source follower transfer function formula, in electronics, a common-drain amplifier, also known as a source follower, is one of three basic single-stage field-effect transistor (FET) amplifier topologies, typically used as a voltage buffer. The analogous bipolar junction transistor circuit is the common-collector amplifier is calculated using Constant B = (((Gate to Source Capacitance+Gate to Drain Capacitance)*Capacitance+(Gate to Source Capacitance+Gate to Source Capacitance))/(Transconductance*Load Resistance+1))*Signal Resistance*Load Resistance. To calculate Constant 2 of Source Follower Transfer Function, you need Gate to Source Capacitance (C_gs), Gate to Drain Capacitance (C_gd), Capacitance (C_t), Transconductance (g_m), Load Resistance (R_L) & Signal Resistance (R_sig). With our tool, you need to enter the respective value for Gate to Source Capacitance, Gate to Drain Capacitance, Capacitance, Transconductance, Load Resistance & Signal Resistance 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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