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Old 14th October 2007, 07:08 AM   #1
grjr is offline grjr  United States
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Default help with monolithic filter design

I'm trying to design an all in one HPF, LPF, BPF with a cutoff/center frequency of 1kHz. I've made two block diagrams, one using two integrators the other using two differentiators, my problem is that for a cut off frequency of 1kHz, w is 2000*pi, and w^2 is ~40 million. These numbers aren't practical for construction of an actual circuit. I've tried moving blocks around and I haven't been able to find any manipulation that gives something practical. Does anyone have any tips? I know it would be easier to build each filter independent of the others but that isn't what I am trying to do. here's a block diagram of the filter using two differentiators:

http://picasaweb.google.com/grjr2000...67672607842034
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Old 14th October 2007, 08:40 AM   #2
Eva is offline Eva  Spain
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Read about state-variable filters...
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