Input Resistance with Feedback of Feedback Transresistance Amplifier (Shunt-Shunt) 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 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 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 Transresistance Amplifier (Shunt-Shunt) [R_inf]

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Formula

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Input Resistance with Feedback of Feedback Transresistance Amplifier (Shunt-Shunt)

Formula

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

Example

`"12.5075kΩ"="25kΩ"/(1+"2.2"*"0.454")`

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Input Resistance with Feedback of Feedback Transresistance Amplifier (Shunt-Shunt) Solution

STEP 0: Pre-Calculation Summary

Formula Used

Input Resistance with Feedback = Input Resistance/(1+Open Loop Gain of an Operational Amplifier*Feedback Factor)
R_inf = R_in/(1+A*β)
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.
Input Resistance - (Measured in Ohm) - The Input Resistance is the resistance seen by the current source or voltage source which drives the circuit.
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.

STEP 1: Convert Input(s) to Base Unit

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

STEP 2: Evaluate Formula

Substituting Input Values in Formula

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

Evaluating ... ...

R_inf = 12507.5045027016

STEP 3: Convert Result to Output's Unit

12507.5045027016 Ohm -->12.5075045027016 Kilohm (Check conversion here)

FINAL ANSWER

12.5075045027016 ≈ 12.5075 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 Shunt Feedback Amplifiers Calculators

Output Resistance of Feedback Transresistance Amplifier(Shunt-Shunt)

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

Input Resistance with Feedback of Feedback Transresistance Amplifier (Shunt-Shunt)

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

Open Loop Gain of Feedback Transresistance Amplifier (Shunt-Shunt)

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

Input Resistance with Feedback of Feedback Transresistance Amplifier (Shunt-Shunt) Formula

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

What does a Transresistance amplifier do?

A transresistance amplifier (TIA) converts current to voltage. Transimpedance amplifiers can be used to process the current output of photodiodes, pressure transducers, accelerometers, and other types of sensors to a voltage formatted as useable signal output.

How to Calculate Input Resistance with Feedback of Feedback Transresistance Amplifier (Shunt-Shunt)?

Input Resistance with Feedback of Feedback Transresistance Amplifier (Shunt-Shunt) calculator uses Input Resistance with Feedback = Input Resistance/(1+Open Loop Gain of an Operational Amplifier*Feedback Factor) to calculate the Input Resistance with Feedback, The Input resistance with feedback of Feedback Transresistance Amplifier (Shunt-Shunt) Given Loop Gain 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 Transresistance Amplifier (Shunt-Shunt) using this online calculator? To use this online calculator for Input Resistance with Feedback of Feedback Transresistance Amplifier (Shunt-Shunt), enter Input Resistance (R_in), Open Loop Gain of an Operational Amplifier (A) & Feedback Factor (β) and hit the calculate button. Here is how the Input Resistance with Feedback of Feedback Transresistance Amplifier (Shunt-Shunt) calculation can be explained with given input values -> 0.012508 = 25000/(1+2.2*0.454).

FAQ

What is Input Resistance with Feedback of Feedback Transresistance Amplifier (Shunt-Shunt)?

The Input resistance with feedback of Feedback Transresistance Amplifier (Shunt-Shunt) Given Loop Gain formula is defined as the resistance seen by the current source or voltage source which drives the circuit and is represented as R_inf = R_in/(1+A*β) or Input Resistance with Feedback = Input Resistance/(1+Open Loop Gain of an Operational Amplifier*Feedback Factor). The Input Resistance is the resistance seen by the current source or voltage source which drives the circuit, 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.

How to calculate Input Resistance with Feedback of Feedback Transresistance Amplifier (Shunt-Shunt)?

The Input resistance with feedback of Feedback Transresistance Amplifier (Shunt-Shunt) Given Loop Gain 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 = Input Resistance/(1+Open Loop Gain of an Operational Amplifier*Feedback Factor). To calculate Input Resistance with Feedback of Feedback Transresistance Amplifier (Shunt-Shunt), you need Input Resistance (R_in), Open Loop Gain of an Operational Amplifier (A) & Feedback Factor (β). With our tool, you need to enter the respective value for Input Resistance, Open Loop Gain of an Operational Amplifier & Feedback Factor 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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