Small Signal Input Resistance Calculator

✖The Input Voltage is the voltage applied to the base terminal. It is the voltage difference between the base terminal and the emitter terminal of the transistor.ⓘ Input Voltage [V_i]			+10% -10%
✖The Base Current s the current that flows into the base terminal. It is the current that controls the collector current of the transistor.ⓘ Base Current [i_b]			+10% -10%

✖The Input Resistance is the resistance seen at the base terminal of the transistor.ⓘ Small Signal Input Resistance [r_π]

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Formula

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Small Signal Input Resistance

Formula

`"r"_{"π"} = "V"_{"i"}/"i"_{"b"}`

Example

`"1.693548Ω"="2.1V"/"1.24A"`

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Small Signal Input Resistance Solution

STEP 0: Pre-Calculation Summary

Formula Used

Input Resistance = Input Voltage/Base Current
r_π = V_i/i_b
This formula uses 3 Variables

Variables Used

Input Resistance - (Measured in Ohm) - The Input Resistance is the resistance seen at the base terminal of the transistor.
Input Voltage - (Measured in Volt) - The Input Voltage is the voltage applied to the base terminal. It is the voltage difference between the base terminal and the emitter terminal of the transistor.
Base Current - (Measured in Ampere) - The Base Current s the current that flows into the base terminal. It is the current that controls the collector current of the transistor.

STEP 1: Convert Input(s) to Base Unit

Input Voltage: 2.1 Volt --> 2.1 Volt No Conversion Required
Base Current: 1.24 Ampere --> 1.24 Ampere No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

r_π = V_i/i_b --> 2.1/1.24

Evaluating ... ...

r_π = 1.69354838709677

STEP 3: Convert Result to Output's Unit

1.69354838709677 Ohm --> No Conversion Required

FINAL ANSWER

1.69354838709677 ≈ 1.693548 Ohm <-- Input Resistance

(Calculation completed in 00.004 seconds)

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Created by Suma Madhuri

VIT University (VIT), Chennai

Suma Madhuri has created this Calculator and 50+ more calculators!

Verified by Parminder Singh

Chandigarh University (CU), Punjab

Parminder Singh has verified this Calculator and 600+ more calculators!

< 14 Resistance Calculators

MOSFET as Linear Resistance given Aspect Ratio

Go Linear Resistance = Channel Length/(Mobility of Electrons at Surface of Channel*Oxide Capacitance*Channel Width*Effective Voltage)

Output Resistance of Differential Amplifier

Go Output Resistance = ((Common Mode Input Signal*Transconductance)-Total Current)/(2*Transconductance*Total Current)

Input Resistance of Mosfet

Go Input Resistance = Input Voltage/(Collector Current*Small Signal Current Gain)

Finite Resistance between Drain and Source

Go Finite Resistance = modulus(Positive DC Voltage)/Drain Current

Output Resistance given Channel Length Modulation

Go Output Resistance = 1/(Channel Length Modulation*Drain Current)

Input Resistance given Transconductance

Go Input Resistance = Small Signal Current Gain/Transconductance

Electron Mean Free Path

Go Electron Mean Free Path = 1/(Output Resistance*Drain Current)

Drain Output Resistance

Go Output Resistance = 1/(Electron Mean Free Path*Drain Current)

Output Resistance given Transconductance

Go Output Resistance = 1/(Carrier Mobility*Transconductance)

Voltage Dependent Resistance in MOSFET

Go Finite Resistance = Effective Voltage/Drain Current

Output Resistance of Mosfet

Go Output Resistance = Early Voltage/Collector Current

Small Signal Input Resistance

Go Input Resistance = Input Voltage/Base Current

Conductance in Linear Resistance of MOSFET

Go Conductance of Channel = 1/Linear Resistance

MOSFET as Linear Resistance

Go Linear Resistance = 1/Conductance of Channel

Small Signal Input Resistance Formula

Input Resistance = Input Voltage/Base Current
r_π = V_i/i_b

What are the factors that affect small signal input resistance?

The factors that affect small signal input resistance vary depending on the type of device or circuit being considered. However, some general factors that can affect small signal input resistance include:

Device type: The type of device used in a circuit can have a significant impact on its small signal input resistance.
Device parameters: The specific parameters of a device can also affect its small signal input resistance.

How to Calculate Small Signal Input Resistance?

Small Signal Input Resistance calculator uses Input Resistance = Input Voltage/Base Current to calculate the Input Resistance, The Small Signal Input Resistance formula is defined as the resistance that it presents to a small signal input signal. It is defined as the ratio of the change in input voltage to the change in input current, when the input voltage is changed by a small amount. Input Resistance is denoted by r_π symbol.

How to calculate Small Signal Input Resistance using this online calculator? To use this online calculator for Small Signal Input Resistance, enter Input Voltage (V_i) & Base Current (i_b) and hit the calculate button. Here is how the Small Signal Input Resistance calculation can be explained with given input values -> 1.693548 = 2.1/1.24.

FAQ

What is Small Signal Input Resistance?

The Small Signal Input Resistance formula is defined as the resistance that it presents to a small signal input signal. It is defined as the ratio of the change in input voltage to the change in input current, when the input voltage is changed by a small amount and is represented as r_π = V_i/i_b or Input Resistance = Input Voltage/Base Current. The Input Voltage is the voltage applied to the base terminal. It is the voltage difference between the base terminal and the emitter terminal of the transistor & The Base Current s the current that flows into the base terminal. It is the current that controls the collector current of the transistor.

How to calculate Small Signal Input Resistance?

The Small Signal Input Resistance formula is defined as the resistance that it presents to a small signal input signal. It is defined as the ratio of the change in input voltage to the change in input current, when the input voltage is changed by a small amount is calculated using Input Resistance = Input Voltage/Base Current. To calculate Small Signal Input Resistance, you need Input Voltage (V_i) & Base Current (i_b). With our tool, you need to enter the respective value for Input Voltage & Base Current 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 Input Resistance?

In this formula, Input Resistance uses Input Voltage & Base Current. We can use 2 other way(s) to calculate the same, which is/are as follows -

Input Resistance = Input Voltage/(Collector Current*Small Signal Current Gain)
Input Resistance = Small Signal Current Gain/Transconductance

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