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Hi, I'm learning the op-amps now, and have a question for the calculation of noise bandwidth:
For the convenience of the calculation, the low fass filter often equivalent to the rectangular filter, called called a brick wall filter, which has the same area as the low pass filter. BW=Kn*fc. The calculation of Kn is shown below, but the result is different with the given Kn, why?
Thank you!
Hello,
We're having a little trouble following your math, but I believe your final calculation for Kn for a 1st order filter is 10^1.5, or 31.62. That would mean the effective bandwidth of a 1kHz filter is 31.62kHz which is way too large.
I think your errors come from the fact that the integration calculation used to determine the area under the curve requires the use of linear (not logarithmic) units.