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Old 18th April 2007, 03:34 PM   #1
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Default 4th order lowpass with one transistor


I've read on a magazine that it is possible to build a 4th order lowpass only by using on transistor stage instead of cascading two 2nd order stages. Is that true? Can anyone guide me, how to do that?


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Old 18th April 2007, 05:08 PM   #2
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A 4th order filter does not require *any* transistors/amplifiers/buffers but
the response of amplitude vs. frequency may be less than desirable for your application.

To answer your question fully, one would have to know something about the desired response curve.
Just because you can't hear it doesn't mean no one can.
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Old 18th April 2007, 05:42 PM   #3
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Ok, for an example let's say we want to make a Bessel filter with the design frequency 1kHz.
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