The question is quite broad. Do you have a circuit in mind that we could look at and provide some pointers?If you don't have a data sheet for a certain circuit how do you found out whether there is a LP, HP or BP filter? How shall you analyse the circuit on the matter?
Thanks for the good information!Bandpass filters can be tricky. In general for the other types, if the series pass element is a capacitor, it is going to be an HP filter. If the capacitors shunt the signal to ground, then it will be an LP filter. BP filters use HP and LP filtering, so they are somewhat harder to figure out.
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by Luke James