Before revision: To carry out this scaling to a nominal impedance R, each impedance element of the filter is transformed by: It may be more convenient on some elements to scale the admittance instead: The prototype filter above, transformed to a 600Ω, 16kHz lowpass filter It can readily be seen that to achieve this, the non-resistive components of the filter must be scaled as: and, Impedance scaling by itself has no effect on the transfer function of the filter (providing that the terminating impedances have the same scaling applied to them).
After revision: To carry out this scaling to a nominal impedance R, each impedance element of the filter is transformed by: It may be more convenient on some elements to scale the admittance instead: The prototype filter above, transformed to a 600 Ω, 16 kHz lowpass filter It can readily be seen that to achieve this, the non-resistive components of the filter must be scaled as: and, Impedance scaling by itself has no effect on the transfer function of the filter (providing that the terminating impedances have the same scaling applied to them).