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Old 29th Nov 2017, 4:13 pm   #12
cmjones01
Nonode
 
Join Date: Oct 2008
Location: Warsaw, Poland and Cambridge, UK
Posts: 2,669
Default Re: Attenuators - theory and the design of.

If you're only concerned about the magnitude of the output, then yes, you can ignore the phase relationship. But since the requirement is for a non-frequency-dependent attenuator, the phase relationship is important. If we ignore the difference between real and imaginary parts, we've allowed the phase to vary, and it will vary with frequency, which isn't what we wanted. Therefore it's necessary to calculate using the real and imaginary parts of the input and output impedances.

Chris
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