filter with a limited frequency range.
Some might call it a shelving filter.
The first part outside the red is difficult to get right.
A single pole filter that is buffered such that Rs= zero and Rload = infinity is a standard filter block.
You show a two stage filter where the Rload of the second stage "loads" the first stage such that Rload << infinity.
And the first stage sources the second stage such that Rs>>0.
This results in the cascaded filters NOT performing as two single pole filters with the correct loading.
Some might call it a shelving filter.
The first part outside the red is difficult to get right.
A single pole filter that is buffered such that Rs= zero and Rload = infinity is a standard filter block.
You show a two stage filter where the Rload of the second stage "loads" the first stage such that Rload << infinity.
And the first stage sources the second stage such that Rs>>0.
This results in the cascaded filters NOT performing as two single pole filters with the correct loading.
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