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IIR (discrete time) filter reference chart

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Someone:
In a similar vein to the more widely applicable reactive impedance chart: https://www.eevblog.com/forum/chat/reactance-(impedance)-quick-reference-chart/
this is instead for the RC circuit equivalent in discrete time, which doesn't really fit into any one of many subforms here so general it is.

Another mental calculation that I come back to routinely, but didn't have a good reference for the "accurate" calculations and instead relied on the linear approximations. So this pulls together calculations in all directions: time or frequency to/from alpha coefficient, and plots the region where the approximations diverge.

Download the pdf, it has smaller file size and higher quality.

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