On Wed, 10 Jul 2002, Brendan Moran wrote:

>> I really don't know the answer but maybe you could use a spectrum analyzer
>> and a noise source. This will not tell you the impedance but you should be
>> able to improve your circuit by trial and error. It may also show you any
>> resonances in band, and noise peaks. A dense 'fence rail' signal may
>> replace the noise generator and make the noise floor easier to see on the
>> specan when you tweak the circuit.

BTW the noise peaks and the noise floor slope can let you infer something
useful about the imaginary part of the input. If you are careful you
should be able to read at least the modulus of the imaginary component
from the specan if not the phase.

Peter

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