Upper 3-DB Frequency of Feedback Amplifier Calculator

✖3-dB Frequency is the point at which the signal has been attenuated by 3dB (in a bandpass filter).ⓘ 3-dB Frequency [f_3dB]			+10% -10%
✖The Mid band Gain of a transistor is the transistor's gain at its mid frequencies; the mid band gain is where the transistor's gain is at the highest and most constant level in its bandwidth.ⓘ Mid Band Gain [A_m]			+10% -10%
✖The feedback factor of an op-amp application defines the circuit performance.ⓘ Feedback Factor [β]			+10% -10%

✖Upper 3-dB frequency is the cutoff frequency of an electronic amplifier stage at which the output power has dropped to half of its mid-band level.ⓘ Upper 3-DB Frequency of Feedback Amplifier [ω_hf]

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Upper 3-DB Frequency of Feedback Amplifier Solution

STEP 0: Pre-Calculation Summary

Formula Used

Upper 3-dB Frequency = 3-dB Frequency*(1+Mid Band Gain*Feedback Factor)
ω_hf = f_3dB*(1+A_m*β)
This formula uses 4 Variables

Variables Used

Upper 3-dB Frequency - (Measured in Hertz) - Upper 3-dB frequency is the cutoff frequency of an electronic amplifier stage at which the output power has dropped to half of its mid-band level.
3-dB Frequency - (Measured in Hertz) - 3-dB Frequency is the point at which the signal has been attenuated by 3dB (in a bandpass filter).
Mid Band Gain - The Mid band Gain of a transistor is the transistor's gain at its mid frequencies; the mid band gain is where the transistor's gain is at the highest and most constant level in its bandwidth.
Feedback Factor - The feedback factor of an op-amp application defines the circuit performance.

STEP 1: Convert Input(s) to Base Unit

3-dB Frequency: 2.9 Hertz --> 2.9 Hertz No Conversion Required
Mid Band Gain: 20.9 --> No Conversion Required
Feedback Factor: 0.454 --> No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

ω_hf = f_3dB*(1+A_m*β) --> 2.9*(1+20.9*0.454)

Evaluating ... ...

ω_hf = 30.41694

STEP 3: Convert Result to Output's Unit

30.41694 Hertz --> No Conversion Required

FINAL ANSWER

30.41694 Hertz <-- Upper 3-dB Frequency

(Calculation completed in 00.020 seconds)

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Credits

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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< BW Extension and Signal Interference Calculators

Gain with Feedback at Mid and High Frequency

LaTeX Go Gain with Feedback = (Mid Band Gain/(1+(Mid Band Gain*Feedback Factor)))/((1+(Complex Frequency Variable/Upper 3-dB Frequency)*(1+(Mid Band Gain*Feedback Factor))))

Gain at Mid and High Frequencies

LaTeX Go Gain Factor = Mid Band Gain/(1+(Complex Frequency Variable/Upper 3-dB Frequency))

Signal-to-Interference Ratio at Output

LaTeX Go Signal to Interference Ratio = (Source Voltage/Voltage Interference)*Gain Factor

Lower 3-DB Frequency in Bandwidth Extension

LaTeX Go Lower 3-dB Frequency = 3-dB Frequency/(1+(Mid Band Gain*Feedback Factor))

< Negative Feedback Amplifiers Calculators

Gain at Mid and High Frequencies

LaTeX Go Gain Factor = Mid Band Gain/(1+(Complex Frequency Variable/Upper 3-dB Frequency))

Gain with Feedback of Feedback Amplifier

LaTeX Go Gain with Feedback = (Open Loop Gain of an Operational Amplifier)/Amount of Feedback

Closed-Loop Gain as Function of Ideal Value

LaTeX Go Closed-Loop Gain = (1/Feedback Factor)*(1/(1+(1/Loop Gain)))

Amount of Feedback Given Loop Gain

LaTeX Go Amount of Feedback = 1+Loop Gain

Upper 3-DB Frequency of Feedback Amplifier Formula

LaTeX Go

Upper 3-dB Frequency = 3-dB Frequency*(1+Mid Band Gain*Feedback Factor)
ω_hf = f_3dB*(1+A_m*β)

What is the effect of negative feedback on an amplifier?

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. Due to these advantages, negative feedback is frequently used in amplifiers.

How to Calculate Upper 3-DB Frequency of Feedback Amplifier?

Upper 3-DB Frequency of Feedback Amplifier calculator uses Upper 3-dB Frequency = 3-dB Frequency*(1+Mid Band Gain*Feedback Factor) to calculate the Upper 3-dB Frequency, The Upper 3-dB frequency of feedback amplifier formula is defined as point at which signal has been attenuated by 3dB (in bandpass filter). This is generally considered point for determining filter's bandwidth. bandwidth is defined as difference between upper and lower 3dB points. Upper 3-dB Frequency is denoted by ω_hf symbol.

How to calculate Upper 3-DB Frequency of Feedback Amplifier using this online calculator? To use this online calculator for Upper 3-DB Frequency of Feedback Amplifier, enter 3-dB Frequency (f_3dB), Mid Band Gain (A_m) & Feedback Factor (β) and hit the calculate button. Here is how the Upper 3-DB Frequency of Feedback Amplifier calculation can be explained with given input values -> 30.41694 = 2.9*(1+20.9*0.454).

FAQ

What is Upper 3-DB Frequency of Feedback Amplifier?

The Upper 3-dB frequency of feedback amplifier formula is defined as point at which signal has been attenuated by 3dB (in bandpass filter). This is generally considered point for determining filter's bandwidth. bandwidth is defined as difference between upper and lower 3dB points and is represented as ω_hf = f_3dB*(1+A_m*β) or Upper 3-dB Frequency = 3-dB Frequency*(1+Mid Band Gain*Feedback Factor). 3-dB Frequency is the point at which the signal has been attenuated by 3dB (in a bandpass filter), The Mid band Gain of a transistor is the transistor's gain at its mid frequencies; the mid band gain is where the transistor's gain is at the highest and most constant level in its bandwidth & The feedback factor of an op-amp application defines the circuit performance.

How to calculate Upper 3-DB Frequency of Feedback Amplifier?

The Upper 3-dB frequency of feedback amplifier formula is defined as point at which signal has been attenuated by 3dB (in bandpass filter). This is generally considered point for determining filter's bandwidth. bandwidth is defined as difference between upper and lower 3dB points is calculated using Upper 3-dB Frequency = 3-dB Frequency*(1+Mid Band Gain*Feedback Factor). To calculate Upper 3-DB Frequency of Feedback Amplifier, you need 3-dB Frequency (f_3dB), Mid Band Gain (A_m) & Feedback Factor (β). With our tool, you need to enter the respective value for 3-dB Frequency, Mid Band Gain & 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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