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Formula for Upper Limit Frequency: Operational Amplifier, Unipolar Voltage, fg2 Calculation

jubson 24917 8
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Treść została przetłumaczona polish » english Zobacz oryginalną wersję tematu
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  • #1 5286647
    jubson
    Level 1  
    Hello. I would very much like to ask for a formula for the upper limit frequency of the voltage gain (an operational amplifier with unipolar voltage-voltage transmittance is used and the signal frequency is higher than the limit frequency of the voltage transmittance of the open-loop amplifier). and the formula for the upper limit frequency fg2. greetings
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  • #2 5288835
    11111olo
    Level 42  
    I guess you mean it

    F = 1 / (2 * PI * R * C)
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  • #3 5288845
    Przetwornik
    Level 26  
    11111olo wrote:
    I guess you mean it

    F = 1 / (2 * PI * R * C)

    This is the formula for the resonant frequency, not an upper limit ...
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  • #5 5289259
    jony
    Electronics specialist  
    Przetwornik wrote:
    11111olo wrote:
    I guess you mean it

    F = 1 / (2 * PI * R * C)

    This is the formula for the resonant frequency, not an upper limit ...

    What ? What is the formula for?
    Lest your colleague be surprised, but this pattern may turn out to be true.
    It all depends on the scheme. Because that's how we can ask what our friend meant jubson
    https://www.elektroda.pl/rtvforum/topic942574.html#4806073
  • #6 5290213
    Przetwornik
    Level 26  
    They taught me at school that the formula F = 1 / (2 * PI * R * C) is for the resonant frequency of filters and RLC circuits, and the formula for the upper frequency is 0.707 * Kumax in amplifiers
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  • #7 5291916
    inkognito09
    Level 29  
    Przetwornik wrote:
    They taught me at school that the formula F = 1 / (2 * PI * R * C) is for the resonant frequency of filters and RLC circuits, and the formula for the upper frequency is 0.707 * Kumax in amplifiers


    This is the bandwidth that we are looking for "manually" with the oscilloscope have Ku at reference F (for MCZ 1kHz). Again, it can be calculated from the values of the elements.
  • #8 5292421
    jony
    Electronics specialist  
    Przetwornik wrote:
    They taught me at school that the formula F = 1 / (2 * PI * R * C) is for the resonant frequency of filters and RLC circuits, and the formula for the upper frequency is 0.707 * Kumax in amplifiers

    Are you sure they were talking about this pattern resonant frequency ? Because I do not see resonance in the RC filter?

    And take my word for it, there are circuits where the formula for the frequency border looks like this:
    F = 1 / (2 * PI * R * C) For example:
    Formula for Upper Limit Frequency: Operational Amplifier, Unipolar Voltage, fg2 Calculation
    For R1 = 1K; R2 = 24K and C2 = 3.3nF
    Are you able to determine the cut-off frequency?
    Because how can I determine Fg from the formula
    0.707 * Kuma = 0.707 * 24 = 16.9 [V / V] and what does this have to do with frequency?
  • #9 5292507
    Przetwornik
    Level 26  
    jony wrote:

    Because how can I determine Fg from the formula
    0.707 * Kuma = 0.707 * 24 = 16.9 [V / V] and what does this have to do with frequency?

    I meant the frequency at 0.707 * Kumax
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Topic summary

The discussion revolves around the formula for calculating the upper limit frequency (fg2) of an operational amplifier (op-amp) with unipolar voltage. Various participants clarify that the formula F = 1 / (2 * PI * R * C) is typically associated with resonant frequency in RLC circuits, not specifically for upper limit frequency in amplifiers. The correct approach involves using the formula for bandwidth, which is expressed as 0.707 * Kumax, where Kumax represents the maximum voltage gain. Participants also discuss the importance of circuit configuration in determining the frequency response and provide links to additional resources for further understanding.
Summary generated by the language model.
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