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Pole vaulting

A beginners guide to filter design . By Simon Bramble.

There is just no getting away from it, analogue design goes hand in hand with hard sums, and designing filters is best left to the alchemist in the corner. But it needn't be this way.

Analogue electronics has two distinct sides: the theory taught by academic institutions (equations of stability, phase shift calculations), and the practical side familiar to most engineers (avoid oscillation by tweaking the gain with a capacitor). Unfortunately, filter design is based firmly on long established equations and tables of theoretical results. Filter design from theoretical equations can prove arduous. Consequently, this discussion employs a minimum of math oeither in translating the theoretical tables into practical component values, or in deriving the response of a general purpose filter.

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Graham Pitcher

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