Op amp bandwidth and gain problem

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SUMMARY

The discussion focuses on calculating the 3dB frequency (F3db) for inverting and non-inverting operational amplifiers (op amps). For a non-inverting op amp with a bandwidth gain product of 1.5x10^6 Hz and a gain of 20dB, the F3db is calculated to be 150kHz. The F3db for the inverting op amp is noted to be approximately 136kHz, though the calculation method remains unclear to some participants. The difference in gain between the two configurations is attributed to the resistor ratio in the feedback network.

PREREQUISITES
  • Understanding of operational amplifier configurations (inverting and non-inverting)
  • Familiarity with bandwidth gain product calculations
  • Knowledge of decibel (dB) gain representation
  • Basic principles of resistor networks in feedback circuits
NEXT STEPS
  • Learn how to calculate the 3dB frequency for inverting op amps using resistor values
  • Study the impact of resistor ratios on gain in op amp circuits
  • Explore the concept of bandwidth gain product in greater detail
  • Investigate the differences in frequency response between inverting and non-inverting op amps
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Electronics engineers, students studying circuit design, and anyone involved in designing or analyzing operational amplifier circuits.

greg997
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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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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).
 
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.
 

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