776ft
Newbie level 6
recently i am working on a complex band-pass filter, and encounter some problems, anyone can help me
as the fig posted, when the center frequency of the filter is designed lower than 500kHz, every thing seems normal, the outputs increase linearly as the inputs increase. but when the center frequency is designed higher than 500kHz(eg.700kHz), the outputs of the filter will increase faster than the inputs increase, and for the same inputs frequency with different magnitude, phase-shift will occur at the outputs, and the frequecy does not change. But if i decrease the Q-value of the filter, the performance of the filter will be improved, but that Q-value is unacceptable to my design,
am I make it clear? is it the problem of the design? or the problem of this type of filter? please help, thank you
as the fig posted, when the center frequency of the filter is designed lower than 500kHz, every thing seems normal, the outputs increase linearly as the inputs increase. but when the center frequency is designed higher than 500kHz(eg.700kHz), the outputs of the filter will increase faster than the inputs increase, and for the same inputs frequency with different magnitude, phase-shift will occur at the outputs, and the frequecy does not change. But if i decrease the Q-value of the filter, the performance of the filter will be improved, but that Q-value is unacceptable to my design,
am I make it clear? is it the problem of the design? or the problem of this type of filter? please help, thank you