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'Searching for high pass active filter,'
1996\08\13@131137 by NEIL GANDLER

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I am currently using an MF4CN, a low pass 4th order switched capacitor
butterworth filter as a subwoofer crossover. It is a very handy device,
considering that I can use the PWM in my 16c74 to control its
center frequency. I really would like to find a similar high pass equivalent.
Unfornuately National Semiconductor doesn't make a complement to the
MF4CN. Perhaps someone knows of a similar device that could do the trick?
Any switched cap high pass filter would do the trick. I would appreciate
any advice.

               Neil Gandler

1996\08\13@140037 by Mark K Sullivan

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Have you checked Linear Technology?  They have a lot of clock-tuned filters.  I
don't know about high pass but I have used their low- and band-pass models with
good results.

- Mark Sullivan -

1996\08\13@165826 by Paul Mathews

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NEIL GANDLER wrote:
>
>  I am currently using an MF4CN, a low pass 4th order switched capacitor
> butterworth filter as a subwoofer crossover. It is a very handy device,
> considering that I can use the PWM in my 16c74 to control its
> center frequency. I really would like to find a similar high pass equivalent.
> Unfornuately National Semiconductor doesn't make a complement to the
> MF4CN. Perhaps someone knows of a similar device that could do the trick?
> Any switched cap high pass filter would do the trick. I would appreciate
> any advice.
>
>                 Neil Gandler


A low pass filter plus a differencing op-amp makes a hi-pass filter with
a little care.  It would be dead simple if it weren't for the fact that
your LP filter may not preserve phase too well.  However, be aware that
there's really no such animal as pure high pass: it has to roll off at
some upper frequency.
--

Paul Mathews, consulting engineer
AEngineering Co.
spam_OUToptoengTakeThisOuTspamwhidbey.com
non-contact sensing and optoelectronics specialists

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