These calculators will provide schematics and ideal component values
for a variety of filter types (e.g. Butterworth, Chebyshev/Tchebysheff,
Bessel) and attenuator configurations. Some will also provide response
curves.
To implement the desired design with standard components, it may be
necessary to use multiple component values in series or parallel
configurations to approximate the calculated values. For example, the
design for a 6 dB 50 Ω attenuator calls for a 37.4 Ω
resistor, a value that is not commonly available. The attenuator can
instead be built with two 75 Ω resistors in parallel, producing a
very good 6 dB attenuator from standard components:
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| "Ideal" 6 dB Attenuator Design |
Actual 6 dB Attenuator Implementation |
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