I've got to design a second order band pass filter than has cut-off frequencies of 1kHz and 250kHz. I have to use the E12 series for resistors and capacitors so I can't get that exact bandwidth - but as near as.
I initially designed a low pass filter and then a high pass filter individually, which achieved near enough the right frequencies. Upon combining the two stages, my upper cut off frequency has reduced by over half.
Please can someone explain why this might be? My knowledge is very limited, hence my design I've tried to keep easy to understand.
I initially designed a low pass filter and then a high pass filter individually, which achieved near enough the right frequencies. Upon combining the two stages, my upper cut off frequency has reduced by over half.
Please can someone explain why this might be? My knowledge is very limited, hence my design I've tried to keep easy to understand.
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