Op amp bandwidth and gain problem

In summary, the conversation discusses how to calculate the 3db frequency of an inverting op amp and the difference in gain between non-inverting and inverting op amps. The formula for calculating the 3db frequency is provided for the non-inverting op amp, but not for the inverting op amp. The difference in gain is determined by the external components, specifically the ratio of resistors.
  • #1
greg997
109
2
Could sb explain to me how to calculate the 3db frequency of the inverting op amp, please?

1. For non-inverting op amp
If Bandwidth gain product is 1.5x10^6 Hz and gain is 20dB then the F3db is given by Bandwidth gain product over 20. It equals 150kHz.

2. For inverting op amp the F3db is supposed to be 136kHz. But no idea how to calculate this.

What is the difference in gaing given by non and inverting opamp?

Thanks for help
 
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  • #2
greg997 said:
Could sb explain to me how to calculate the 3db frequency of the inverting op amp, please?

1. For non-inverting op amp
If Bandwidth gain product is 1.5x10^6 Hz and gain is 20dB then the F3db is given by Bandwidth gain product over 20. It equals 150kHz.

2. For inverting op amp the F3db is supposed to be 136kHz. But no idea how to calculate this.

What is the difference in gaing given by non and inverting opamp?

Thanks for help

What's the external gain for question #2? It appears to be given for question #1 (set by external components).
 
  • #3
The gain is the same as in example with non inverting op amp. I ve heard that it is about ratio of resistors.It's lower therefore cutoff frequency is lower a bit. But no idea how to calculate this.
 

FAQ: Op amp bandwidth and gain problem

What is an op amp?

An op amp, or operational amplifier, is an electronic device that amplifies the difference between two input voltages. It is commonly used in electronic circuits to perform mathematical operations such as addition, subtraction, and differentiation.

What is bandwidth in relation to op amps?

Bandwidth refers to the range of frequencies over which an op amp can accurately amplify a signal. It is typically measured in hertz (Hz) and is an important factor in determining the overall performance of an op amp.

Why is bandwidth important in op amps?

Bandwidth is important because it determines the frequency range in which an op amp can accurately amplify a signal. If an op amp has a limited bandwidth, it may not be able to amplify high-frequency signals effectively, resulting in distortion or loss of information.

What is gain in relation to op amps?

Gain is the measure of an op amp's ability to increase the amplitude of a signal. It is typically expressed in decibels (dB) and is a crucial factor in determining the overall amplification capabilities of an op amp.

How do bandwidth and gain impact op amp performance?

Bandwidth and gain both play important roles in op amp performance. A high bandwidth is necessary for accurate amplification of high-frequency signals, while a high gain is necessary for amplifying low-amplitude signals. However, increasing one may affect the other, so it is important to find a balance between the two for optimal op amp performance.

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