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PICList Thread
'[EE]: Active Filter Design Software'
2003\06\10@184954 by John Hansen

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Hi Folks:

I need to design an active high pass filter with a cut off of 1KHz.  Now I
know I could haul out the books and do this from the equations (I seem to
remember actually going through that exercise about 15 years ago), but I'm
hoping there is now a software solution.  Ideally I'd like to find
something just like Microchip's FilterLab, that could do the design and
graph the frequency response.   Unfortunately, FilterLab will currently
only do low pass filters (I know the other filters are coming, but
unfortunately I need to do this now).  Can anybody point me the direction
of some software (cheap or free.. I only need to do this very infrequently)
that might be able to help with this problem.

Thanks in advance!

John Hansen

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2003\06\10@193018 by Jack Smith

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Linear Technology FilterCAD will do exactly what you want, including drawing
a schematic for you. It covers both switched capacitor and op-amp analog
filters, high/low/bandpass, etc.

It's available for free download at http://www.linear.com/software/

Jack



{Original Message removed}

2003\06\10@195352 by Tom Messenger

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Design your filter as a lowpass using FilterLab.

Then swap the location of the resistor/capacitor pairs that determine the
frequency response.

Make sure you still have a dc path to every pin. You will then turn the
lowpass into a highpass filter.  Build it and test.

Tom M.


At 06:46 PM 6/10/03 -0400, you wrote:
>Hi Folks:
>
>I need to design an active high pass filter with a cut off of 1KHz.
-SNIP-
>Unfortunately, FilterLab will currently
>only do low pass filters (I know the other filters are coming, but
>unfortunately I need to do this now).
>Thanks in advance!
>
>John Hansen

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