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Originally Posted by Skywave
So if in one of the traditional equations that starts 'Z = etc.', should I calculate the Z as √(R² + X²) and ignore the phase relationship between the R and the X?
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No, even if you are only concerned about magnitude. As I said, use a normal design method but then scale the result (or calculate it directly if you can do complex arithmetic).
Lets say you have a calculator for 50R impedance attenuators, but your load and source impedance is 100R+50pF (in series). Say one of the resistor values you calculated (for a 50R attenuator) is 35R. Then in the circuit in this position you put 70R+71.4pF. This maintains the same ratios.