Tuesday, 15 May 2018

circuit analysis - Band-pass Filter Topology help


I am trying to design a pre-amplifer and just starting basic.



Using a low pass filter and a high pass filter with already determine cut off frequencies.


The problem is that I thought it doesn't matter how you cascade the filters as its super positioned (Both linear), however when I put the LPF then the HPF my cut off frequencies become all whack. When I put the HPF then the LPF it works perfectly, whats going on? I am pretty sure there's something simply I am not taking to account, making the low resistor and cap values to ground.


Low-pass filter: enter image description here


High-pass filter: enter image description here


LPF-> HPF Topology


enter image description here


HPF-> LPF Topology enter image description here


Circuit: enter image description here


Any help would be appreciated!




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