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Input Resistance with Feedback Current Amplifier Formula

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The input resistance with feedback of a feedback amplifier is equal to the source impedance for which loop gain would drop to unity. Check FAQs

R inf = \frac{R in}{1 + Aβ}

R_inf - Input Resistance with Feedback?R_in - Input Resistance?Aβ - Loop Gain?

Input Resistance with Feedback Current Amplifier Example

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With units

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Here is how the Input Resistance with Feedback Current Amplifier equation looks like with Values.

Here is how the Input Resistance with Feedback Current Amplifier equation looks like with Units.

Here is how the Input Resistance with Feedback Current Amplifier equation looks like.

6.9444 = \frac{25}{1 + 2.6}

6.9444kΩ = \frac{25kΩ}{1 + 2.6}

6.9444 = \frac{25}{1 + 2.6}

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Input Resistance with Feedback Current Amplifier Solution

Follow our step by step solution on how to calculate Input Resistance with Feedback Current Amplifier?

FIRST Step Consider the formula

R inf = \frac{R in}{1 + Aβ}

Next Step Substitute values of Variables

∴

R inf = \frac{25kΩ}{1 + 2.6}

Next Step Convert Units

∴

R inf = \frac{25000Ω}{1 + 2.6}

Next Step Prepare to Evaluate

∴

R inf = \frac{25000}{1 + 2.6}

Next Step Evaluate

∴

R inf = 6944.44444444444Ω

Next Step Convert to Output's Unit

∴

R inf = 6.94444444444444kΩ

LAST Step Rounding Answer

∴

R inf = 6.9444kΩ

Input Resistance with Feedback Current Amplifier Formula Elements

Variables

Input Resistance with Feedback

The input resistance with feedback of a feedback amplifier is equal to the source impedance for which loop gain would drop to unity.

Symbol: R_inf

Measurement: Electric ResistanceUnit: kΩ

Note: Value should be greater than 0.

Formulas to find Input Resistance with Feedback

Input Resistance

The Input Resistance is the resistance seen by the current source or voltage source which drives the circuit.

Symbol: R_in

Measurement: Electric ResistanceUnit: kΩ

Note: Value should be greater than 0.

Formulas to find Input Resistance

Loop Gain

The loop gain is calculated by imagining the feedback loop is broken at some point and calculating the net gain if a signal is applied.

Symbol: Aβ

Measurement: NAUnit: Unitless

Note: Value should be greater than 0.

Formulas to find Loop Gain

Other formulas in Current Feedback Amplifiers category

Go Amount of Feedback Given Loop Gain

F am = 1 + Aβ

Go Closed-Loop Gain as Function of Ideal Value

A cl = (\frac{1}{β}) \cdot (\frac{1}{1 + (\frac{1}{Aβ})})

Go Gain with Feedback of Feedback Amplifier

A f = \frac{A}{F am}

Go Gain at Mid and High Frequencies

µ = \frac{A m}{1 + (\frac{s}{ω hf})}

How to Evaluate Input Resistance with Feedback Current Amplifier?

Input Resistance with Feedback Current Amplifier evaluator uses Input Resistance with Feedback = Input Resistance/(1+Loop Gain) to evaluate the Input Resistance with Feedback, Input Resistance with Feedback Current Amplifier is defined as the resistance seen by the current source or voltage source which drives the circuit. Input Resistance with Feedback is denoted by R_inf symbol.

How to evaluate Input Resistance with Feedback Current Amplifier using this online evaluator? To use this online evaluator for Input Resistance with Feedback Current Amplifier, enter Input Resistance (R_in) & Loop Gain (Aβ) and hit the calculate button.

FAQs on Input Resistance with Feedback Current Amplifier

What is the formula to find Input Resistance with Feedback Current Amplifier?

The formula of Input Resistance with Feedback Current Amplifier is expressed as Input Resistance with Feedback = Input Resistance/(1+Loop Gain). Here is an example- 0.006944 = 25000/(1+2.6).

How to calculate Input Resistance with Feedback Current Amplifier?

With Input Resistance (R_in) & Loop Gain (Aβ) we can find Input Resistance with Feedback Current Amplifier using the formula - Input Resistance with Feedback = Input Resistance/(1+Loop Gain).

Can the Input Resistance with Feedback Current Amplifier be negative?

No, the Input Resistance with Feedback Current Amplifier, measured in Electric Resistance cannot be negative.

Which unit is used to measure Input Resistance with Feedback Current Amplifier?

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

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Input Resistance with Feedback Current Amplifier Formula

Input Resistance with Feedback Current Amplifier Example

Input Resistance with Feedback Current Amplifier Solution

Input Resistance with Feedback Current Amplifier Formula Elements

Other formulas in Current Feedback Amplifiers category

How to Evaluate Input Resistance with Feedback Current Amplifier?

FAQs on Input Resistance with Feedback Current Amplifier

Variable Name