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Differential Input Resistance of BJT Amplifier Formula

GoDifferential Input Resistance of BJT Amplifier given Small-Signal Input Resistance Formula

GoDifferential Input Resistance of BJT Amplifier given Common-Emitter Current Gain Formula

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Differential Input Resistance is defined as a single-ended "resistor" (connected between the input and ground) in the case of differential mode. Check FAQs

R id = \frac{V id}{i B}

R_id - Differential Input Resistance?V_id - Differential Input Voltage?i_B - Base Current?

Differential Input Resistance of BJT Amplifier Example

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With units

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Here is how the Differential Input Resistance of BJT Amplifier equation looks like with Values.

Here is how the Differential Input Resistance of BJT Amplifier equation looks like with Units.

Here is how the Differential Input Resistance of BJT Amplifier equation looks like.

27.7778 = \frac{7.5}{0.27}

27.7778kΩ = \frac{7.5V}{0.27mA}

27.7778 = \frac{7.5}{0.27}

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Differential Input Resistance of BJT Amplifier Solution

Follow our step by step solution on how to calculate Differential Input Resistance of BJT Amplifier?

FIRST Step Consider the formula

R id = \frac{V id}{i B}

Next Step Substitute values of Variables

∴

R id = \frac{7.5V}{0.27mA}

Next Step Convert Units

∴

R id = \frac{7.5V}{0.0003A}

Next Step Prepare to Evaluate

∴

R id = \frac{7.5}{0.0003}

Next Step Evaluate

∴

R id = 27777.7777777778Ω

Next Step Convert to Output's Unit

∴

R id = 27.7777777777778kΩ

LAST Step Rounding Answer

∴

R id = 27.7778kΩ

Differential Input Resistance of BJT Amplifier Formula Elements

Variables

Differential Input Resistance

Differential Input Resistance is defined as a single-ended "resistor" (connected between the input and ground) in the case of differential mode.

Symbol: R_id

Measurement: Electric ResistanceUnit: kΩ

Note: Value can be positive or negative.

Formulas to find Differential Input Resistance

Differential Input Voltage

Differential Input Voltage is defined as signal input circuit where SIGNAL LO and SIGNAL HI are electrically floating with respect to ANALOG GROUND.

Symbol: V_id

Measurement: Electric PotentialUnit: V

Note: Value can be positive or negative.

Formulas to find Differential Input Voltage

Base Current

Base Current 2 is a crucial current of bipolar junction transistor. Without the base current, the transistor cannot turn on.

Symbol: i_B

Measurement: Electric CurrentUnit: mA

Note: Value should be greater than 0.

Formulas to find Base Current

Other Formulas to find Differential Input Resistance

Go Differential Input Resistance of BJT Amplifier given Small-Signal Input Resistance

R id = 2 \cdot R BE

Go Differential Input Resistance of BJT Amplifier given Common-Emitter Current Gain

R id = (β + 1) \cdot (2 \cdot R E + 2 \cdot ΔR c)

Other formulas in Resistance category

Go Transconductance of Small Signal Operation of BJT Amplifier

g m = \frac{i c}{V th}

How to Evaluate Differential Input Resistance of BJT Amplifier?

Differential Input Resistance of BJT Amplifier evaluator uses Differential Input Resistance = Differential Input Voltage/Base Current to evaluate the Differential Input Resistance, The Differential input resistance of BJT Amplifier formula is defined as equivalent resistance that would be measured at either input terminal with other terminal grounded. Differential Input Resistance is denoted by R_id symbol.

How to evaluate Differential Input Resistance of BJT Amplifier using this online evaluator? To use this online evaluator for Differential Input Resistance of BJT Amplifier, enter Differential Input Voltage (V_id) & Base Current (i_B) and hit the calculate button.

FAQs on Differential Input Resistance of BJT Amplifier

What is the formula to find Differential Input Resistance of BJT Amplifier?

The formula of Differential Input Resistance of BJT Amplifier is expressed as Differential Input Resistance = Differential Input Voltage/Base Current. Here is an example- 0.027778 = 7.5/0.00027.

How to calculate Differential Input Resistance of BJT Amplifier?

With Differential Input Voltage (V_id) & Base Current (i_B) we can find Differential Input Resistance of BJT Amplifier using the formula - Differential Input Resistance = Differential Input Voltage/Base Current.

What are the other ways to Calculate Differential Input Resistance?

Here are the different ways to Calculate Differential Input Resistance-

Differential Input Resistance=2*Base Emitter Input Resistance
Differential Input Resistance=(Common Emitter Current Gain+1)*(2*Emitter Resistance+2*Change in Collector Resistance)

Can the Differential Input Resistance of BJT Amplifier be negative?

Yes, the Differential Input Resistance of BJT Amplifier, measured in Electric Resistance can be negative.

Which unit is used to measure Differential Input Resistance of BJT Amplifier?

Differential Input Resistance of BJT Amplifier is usually measured using the Kilohm[kΩ] for Electric Resistance. Ohm[kΩ], Megohm[kΩ], Microhm[kΩ] are the few other units in which Differential Input Resistance of BJT Amplifier can be measured.

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