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)
ωhf = f3dB*(1+Am*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
ωhf = f3dB*(1+Am*β) --> 2.9*(1+20.9*0.454)
Evaluating ... ...
ωhf = 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 00.004 seconds)

Credits

Created by Payal Priya
Birsa Institute of Technology (BIT), Sindri
Payal Priya has created this Calculator and 600+ more calculators!
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Vishwakarma Government Engineering College (VGEC), Ahmedabad
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5 BW Extension and Signal Interference Calculators

Gain with Feedback at Mid and High Frequency
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
Go Gain Factor = Mid Band Gain/(1+(Complex Frequency Variable/Upper 3-dB Frequency))
Signal-to-Interference Ratio at Output
Go Signal to Interference Ratio = (Source Voltage/Voltage Interference)*Gain Factor
Lower 3-DB Frequency in Bandwidth Extension
Go Lower 3-dB Frequency = 3-dB Frequency/(1+(Mid Band Gain*Feedback Factor))
Upper 3-DB Frequency of Feedback Amplifier
Go Upper 3-dB Frequency = 3-dB Frequency*(1+Mid Band Gain*Feedback Factor)

15 Negative Feedback Amplifiers Calculators

Feedback Signal
Go Feedback Signal = ((Open Loop Gain of an Operational Amplifier*Feedback Factor)/(1+(Open Loop Gain of an Operational Amplifier*Feedback Factor)))*Source Signal
Error Signal
Go Error Signal = Source Signal/(1+(Open Loop Gain of an Operational Amplifier*Feedback Factor))
Gain at Mid and High Frequencies
Go Gain Factor = Mid Band Gain/(1+(Complex Frequency Variable/Upper 3-dB Frequency))
Signal-to-Interference Ratio at Output
Go Signal to Interference Ratio = (Source Voltage/Voltage Interference)*Gain Factor
Lower 3-DB Frequency in Bandwidth Extension
Go Lower 3-dB Frequency = 3-dB Frequency/(1+(Mid Band Gain*Feedback Factor))
Upper 3-DB Frequency of Feedback Amplifier
Go Upper 3-dB Frequency = 3-dB Frequency*(1+Mid Band Gain*Feedback Factor)
Output Current of Feedback Voltage Amplifier Given Loop Gain
Go Output Current = (1+Loop Gain)*Output Voltage/Output Resistance
Gain with Feedback of Feedback Amplifier
Go Gain with Feedback = (Open Loop Gain of an Operational Amplifier)/Amount of Feedback
Output Signal in Feedback Amplifier
Go Signal Output = Open Loop Gain of an Operational Amplifier*Input Signal Feedback
Output Resistance with Feedback Current Amplifier
Go Output Resistance of Current Amplifier = Amount of Feedback*Output Resistance
Output Resistance with Feedback Voltage Amplifier
Go Output Resistance of Voltage Amplifier = Output Resistance/(1+Loop Gain)
Input Resistance with Feedback Current Amplifier
Go Input Resistance with Feedback = Input Resistance/(1+Loop Gain)
Closed-Loop Gain as Function of Ideal Value
Go Closed-Loop Gain = (1/Feedback Factor)*(1/(1+(1/Loop Gain)))
Feedback Factor of Feedback Amplifier
Go Feedback Factor = Input Signal Feedback/Signal Output
Amount of Feedback Given Loop Gain
Go Amount of Feedback = 1+Loop Gain

Upper 3-DB Frequency of Feedback Amplifier Formula

Upper 3-dB Frequency = 3-dB Frequency*(1+Mid Band Gain*Feedback Factor)
ωhf = f3dB*(1+Am*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 ωhf 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 (f3dB), Mid Band Gain (Am) & 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 ωhf = f3dB*(1+Am*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 (f3dB), Mid Band Gain (Am) & 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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