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Input Resistance with Feedback of Feedback Transconductance Amplifier (Series-Series) 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
Rinf=(1+A⋅β)⋅Rin
Rinf - Input Resistance with Feedback?A - Open Loop Gain of an Operational Amplifier?β - Feedback Factor?Rin - Input Resistance?

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

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Here is how the Input Resistance with Feedback of Feedback Transconductance Amplifier (Series-Series) equation looks like with Values.

Here is how the Input Resistance with Feedback of Feedback Transconductance Amplifier (Series-Series) equation looks like with Units.

Here is how the Input Resistance with Feedback of Feedback Transconductance Amplifier (Series-Series) equation looks like.

49.97Edit=(1+2.2Edit⋅0.454Edit)⋅25Edit
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Input Resistance with Feedback of Feedback Transconductance Amplifier (Series-Series) Solution

Follow our step by step solution on how to calculate Input Resistance with Feedback of Feedback Transconductance Amplifier (Series-Series)?

FIRST Step Consider the formula
Rinf=(1+A⋅β)⋅Rin
Next Step Substitute values of Variables
∴ Rinf=(1+2.2⋅0.454)⋅25kΩ
Next Step Convert Units
∴ Rinf=(1+2.2⋅0.454)⋅25000Ω
Next Step Prepare to Evaluate
∴ Rinf=(1+2.2⋅0.454)⋅25000
Next Step Evaluate
∴Rinf=49970Ω
LAST Step Convert to Output's Unit
∴Rinf=49.97kΩ

Input Resistance with Feedback of Feedback Transconductance Amplifier (Series-Series) 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: Rinf
Measurement: Electric ResistanceUnit: kΩ
Note: Value should be greater than 0.
Formulas to find Input Resistance with FeedbackOpen Variable
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.
Symbol: A
Measurement: NAUnit: Unitless
Note: Value should be greater than 0.
Formulas to find Open Loop Gain of an Operational AmplifierOpen Variable
Feedback Factor
The feedback factor of an op-amp application defines the circuit performance.
Symbol: β
Measurement: NAUnit: Unitless
Note: Value should be less than 1.
Formulas to find Feedback FactorOpen Variable
Input Resistance
The Input Resistance is the resistance seen by the current source or voltage source which drives the circuit.
Symbol: Rin
Measurement: Electric ResistanceUnit: kΩ
Note: Value should be greater than 0.
Formulas to find Input ResistanceOpen Variable

Other formulas in Series Feedback Amplifiers category

​Go Open Loop Gain of Feedback Transconductance Amplifier
A=ioVin
​Go Output Resistance with Feedback of Feedback Transconductance Amplifier
Rcof=(1+A⋅β)⋅Ro

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

Input Resistance with Feedback of Feedback Transconductance Amplifier (Series-Series) evaluator uses Input Resistance with Feedback = (1+Open Loop Gain of an Operational Amplifier*Feedback Factor)*Input Resistance to evaluate 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 Rinf symbol.

How to evaluate Input Resistance with Feedback of Feedback Transconductance Amplifier (Series-Series) using this online evaluator? To use this online evaluator 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 (Rin) and hit the calculate button.

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

What is the formula to find Input Resistance with Feedback of Feedback Transconductance Amplifier (Series-Series)?
The formula of Input Resistance with Feedback of Feedback Transconductance Amplifier (Series-Series) is expressed as Input Resistance with Feedback = (1+Open Loop Gain of an Operational Amplifier*Feedback Factor)*Input Resistance. Here is an example- 0.04997 = (1+2.2*0.454)*25000.
How to calculate Input Resistance with Feedback of Feedback Transconductance Amplifier (Series-Series)?
With Open Loop Gain of an Operational Amplifier (A), Feedback Factor (β) & Input Resistance (Rin) we can find Input Resistance with Feedback of Feedback Transconductance Amplifier (Series-Series) using the formula - Input Resistance with Feedback = (1+Open Loop Gain of an Operational Amplifier*Feedback Factor)*Input Resistance.
Can the Input Resistance with Feedback of Feedback Transconductance Amplifier (Series-Series) be negative?
No, the Input Resistance with Feedback of Feedback Transconductance Amplifier (Series-Series), measured in Electric Resistance cannot be negative.
Which unit is used to measure Input Resistance with Feedback of Feedback Transconductance Amplifier (Series-Series)?
Input Resistance with Feedback of Feedback Transconductance Amplifier (Series-Series) 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 of Feedback Transconductance Amplifier (Series-Series) can be measured.
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