Input Resistance with Feedback of Feedback Transconductance Amplifier (Series-Series) Calculator

✖The Open Loop Gain of an Operational Amplifier is gain of an op-amp without feedback. It is denoted as A.ⓘ Open Loop Gain of an Operational Amplifier [A]			+10% -10%
✖The feedback factor of an op-amp application defines the circuit performance.ⓘ Feedback Factor [β]			+10% -10%
✖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 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 Transconductance Amplifier (Series-Series) [R_inf]

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Formula

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Input Resistance with Feedback of Feedback Transconductance Amplifier (Series-Series)

Formula

`"R"_{"inf"} = (1+"A"*"β")*"R"_{"in"}`

Example

`"49.97kΩ"=(1+"2.2"*"0.454")*"25kΩ"`

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Input Resistance with Feedback of Feedback Transconductance Amplifier (Series-Series) Solution

STEP 0: Pre-Calculation Summary

Formula Used

Input Resistance with Feedback = (1+Open Loop Gain of an Operational Amplifier*Feedback Factor)*Input Resistance
R_inf = (1+A*β)*R_in
This formula uses 4 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.
Open Loop Gain of an Operational Amplifier - The Open Loop Gain of an Operational Amplifier is gain of an op-amp without feedback. It is denoted as A.
Feedback Factor - The feedback factor of an op-amp application defines the circuit performance.
Input Resistance - (Measured in Ohm) - The Input Resistance is the resistance seen by the current source or voltage source which drives the circuit.

STEP 1: Convert Input(s) to Base Unit

Open Loop Gain of an Operational Amplifier: 2.2 --> No Conversion Required
Feedback Factor: 0.454 --> No Conversion Required
Input Resistance: 25 Kilohm --> 25000 Ohm (Check conversion here)

STEP 2: Evaluate Formula

Substituting Input Values in Formula

R_inf = (1+A*β)*R_in --> (1+2.2*0.454)*25000

Evaluating ... ...

R_inf = 49970

STEP 3: Convert Result to Output's Unit

49970 Ohm -->49.97 Kilohm (Check conversion here)

FINAL ANSWER

49.97 Kilohm <-- Input Resistance with Feedback

(Calculation completed in 00.004 seconds)

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Created by Payal Priya

Birsa Institute of Technology (BIT), Sindri

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National Institute Of Technology (NIT), Hamirpur

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< 3 Series Feedback Amplifiers Calculators

Output Resistance with Feedback of Feedback Transconductance Amplifier

Go Output Resistance of Current Amplifier = (1+Open Loop Gain of an Operational Amplifier*Feedback Factor)*Output Resistance

Input Resistance with Feedback of Feedback Transconductance Amplifier (Series-Series)

Go Input Resistance with Feedback = (1+Open Loop Gain of an Operational Amplifier*Feedback Factor)*Input Resistance

Open Loop Gain of Feedback Transconductance Amplifier

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

Input Resistance with Feedback of Feedback Transconductance Amplifier (Series-Series) Formula

Input Resistance with Feedback = (1+Open Loop Gain of an Operational Amplifier*Feedback Factor)*Input Resistance
R_inf = (1+A*β)*R_in

What is the working principle of transconductance amplifier?

A transconductance amplifier converts an input of voltage to an output of current. It is also called a current-to-voltage converter or I-to-V converter. It is called transconductance because the efficiency of the amplifier is measured in units of conductance.

How to Calculate Input Resistance with Feedback of Feedback Transconductance Amplifier (Series-Series)?

Input Resistance with Feedback of Feedback Transconductance Amplifier (Series-Series) calculator uses Input Resistance with Feedback = (1+Open Loop Gain of an Operational Amplifier*Feedback Factor)*Input Resistance to calculate the Input Resistance with Feedback, Input Resistance with Feedback of Feedback Transconductance Amplifier (Series-Series) formula 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 calculate Input Resistance with Feedback of Feedback Transconductance Amplifier (Series-Series) using this online calculator? To use this online calculator for Input Resistance with Feedback of Feedback Transconductance Amplifier (Series-Series), enter Open Loop Gain of an Operational Amplifier (A), Feedback Factor (β) & Input Resistance (R_in) and hit the calculate button. Here is how the Input Resistance with Feedback of Feedback Transconductance Amplifier (Series-Series) calculation can be explained with given input values -> 0.04997 = (1+2.2*0.454)*25000.

FAQ

What is Input Resistance with Feedback of Feedback Transconductance Amplifier (Series-Series)?

Input Resistance with Feedback of Feedback Transconductance Amplifier (Series-Series) formula is defined as the resistance seen by the current source or voltage source which drives the circuit and is represented as R_inf = (1+A*β)*R_in or Input Resistance with Feedback = (1+Open Loop Gain of an Operational Amplifier*Feedback Factor)*Input Resistance. The Open Loop Gain of an Operational Amplifier is gain of an op-amp without feedback. It is denoted as A, The feedback factor of an op-amp application defines the circuit performance & The Input Resistance is the resistance seen by the current source or voltage source which drives the circuit.

How to calculate Input Resistance with Feedback of Feedback Transconductance Amplifier (Series-Series)?

Input Resistance with Feedback of Feedback Transconductance Amplifier (Series-Series) formula is defined as the resistance seen by the current source or voltage source which drives the circuit is calculated using Input Resistance with Feedback = (1+Open Loop Gain of an Operational Amplifier*Feedback Factor)*Input Resistance. To calculate Input Resistance with Feedback of Feedback Transconductance Amplifier (Series-Series), you need Open Loop Gain of an Operational Amplifier (A), Feedback Factor (β) & Input Resistance (R_in). With our tool, you need to enter the respective value for Open Loop Gain of an Operational Amplifier, Feedback Factor & Input 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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