I'm looking at implementing an LC bandpass filter, where I want upper and lower cut off frequencies to be 1254 Hz and 48 Hz respectively.
Based on the pictures I've added - from http://www.radio-electronics.com/info/rf-technology-design/rf-filters/simple-lc-bandpass-filter-design.php - I'm looking at implementing the T Section filter and have attempted to work out values of components, the only issue being that a characteristic impedance is required. Previously, I only really understood this to be associated with transmission lines, however, I last night seen someone say they chose a value and placed an equivalent resistor after the source. Is this a method I should also use?
I will also need to amplify the voltage by around 60dB and as I understand it this should be between the high pass filter and the low pass filter, which way is best to amplify?
Any help is greatly appreciated.
Additional information: The source is a radar motion sensor output, whose voltage is approximately 4mV and a frequency of 21MHz.