Input Resistance with Feedback of Feedback Voltage Amplifier Given Loop Gain Calculator

✖The Input Resistance is the resistance seen by the current source or voltage source which drives the circuit.ⓘ Input Resistance [R_in]			+10% -10%
✖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.ⓘ Loop Gain [Aβ]			+10% -10%

✖The input resistance with feedback of a feedback amplifier is equal to the source impedance for which loop gain would drop to unity.ⓘ Input Resistance with Feedback of Feedback Voltage Amplifier Given Loop Gain [R_inf]

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Input Resistance with Feedback of Feedback Voltage Amplifier Given Loop Gain Solution

STEP 0: Pre-Calculation Summary

Formula Used

Input Resistance with Feedback = Input Resistance*(1+Loop Gain)
R_inf = R_in*(1+Aβ)
This formula uses 3 Variables

Variables Used

Input Resistance with Feedback - (Measured in Ohm) - The input resistance with feedback of a feedback amplifier is equal to the source impedance for which loop gain would drop to unity.
Input Resistance - (Measured in Ohm) - The Input Resistance is the resistance seen by the current source or voltage source which drives the circuit.
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.

STEP 1: Convert Input(s) to Base Unit

Input Resistance: 25 Kilohm --> 25000 Ohm (Check conversion here)
Loop Gain: 2.6 --> No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

R_inf = R_in*(1+Aβ) --> 25000*(1+2.6)

Evaluating ... ...

R_inf = 90000

STEP 3: Convert Result to Output's Unit

90000 Ohm -->90 Kilohm (Check conversion here)

FINAL ANSWER

90 Kilohm <-- Input Resistance with Feedback

(Calculation completed in 00.020 seconds)

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Created by Payal Priya

Birsa Institute of Technology (BIT), Sindri

Payal Priya has created this Calculator and 600+ more calculators!

Verified by Urvi Rathod

Vishwakarma Government Engineering College (VGEC), Ahmedabad

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< Voltage Feedback Amplifiers Calculators

Output Current of Feedback Voltage Amplifier Given Loop Gain

LaTeX Go Output Current = (1+Loop Gain)*Output Voltage/Output Resistance

Open Loop Gain of Feedback Voltage Amplifier

LaTeX Go Open Loop Gain of an Operational Amplifier = Output Voltage/Input Voltage

Input Resistance with Feedback of Feedback Voltage Amplifier Given Loop Gain

LaTeX Go Input Resistance with Feedback = Input Resistance*(1+Loop Gain)

Output Voltage of Feedback Voltage Amplifier

LaTeX Go Output Voltage = (Input Voltage/Feedback Factor)

Input Resistance with Feedback of Feedback Voltage Amplifier Given Loop Gain Formula

LaTeX Go

Input Resistance with Feedback = Input Resistance*(1+Loop Gain)
R_inf = R_in*(1+Aβ)

How the negative feedback affects the input and output resistance?

In negative feedback, the feedback energy (voltage or current), is out of phase with the input signal and thus opposes it. Negative feedback reduces the gain of the amplifier. It also reduces distortion, noise, and instability. This feedback increases bandwidth and improves input and output impedances.

How to Calculate Input Resistance with Feedback of Feedback Voltage Amplifier Given Loop Gain?

Input Resistance with Feedback of Feedback Voltage Amplifier Given Loop Gain calculator uses Input Resistance with Feedback = Input Resistance*(1+Loop Gain) to calculate the Input Resistance with Feedback, Input Resistance with Feedback of Feedback Voltage Amplifier Given Loop Gain formula is defined as the input impedance of a feedback amplifier is equal to the source impedance for which loop gain would drop to unity. Input Resistance with Feedback is denoted by R_inf symbol.

How to calculate Input Resistance with Feedback of Feedback Voltage Amplifier Given Loop Gain using this online calculator? To use this online calculator for Input Resistance with Feedback of Feedback Voltage Amplifier Given Loop Gain, enter Input Resistance (R_in) & Loop Gain (Aβ) and hit the calculate button. Here is how the Input Resistance with Feedback of Feedback Voltage Amplifier Given Loop Gain calculation can be explained with given input values -> 0.09 = 25000*(1+2.6).

FAQ

What is Input Resistance with Feedback of Feedback Voltage Amplifier Given Loop Gain?

Input Resistance with Feedback of Feedback Voltage Amplifier Given Loop Gain formula is defined as the input impedance of a feedback amplifier is equal to the source impedance for which loop gain would drop to unity and is represented as R_inf = R_in*(1+Aβ) or Input Resistance with Feedback = Input Resistance*(1+Loop Gain). The Input Resistance is the resistance seen by the current source or voltage source which drives the circuit & 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.

How to calculate Input Resistance with Feedback of Feedback Voltage Amplifier Given Loop Gain?

Input Resistance with Feedback of Feedback Voltage Amplifier Given Loop Gain formula is defined as the input impedance of a feedback amplifier is equal to the source impedance for which loop gain would drop to unity is calculated using Input Resistance with Feedback = Input Resistance*(1+Loop Gain). To calculate Input Resistance with Feedback of Feedback Voltage Amplifier Given Loop Gain, you need Input Resistance (R_in) & Loop Gain (Aβ). With our tool, you need to enter the respective value for Input Resistance & Loop Gain 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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