Inductor Measurement
Frequency
dependency is common to all real-world components because of the existence of
parasitics.
Not
all parasitics affect the measurement, but some prominent parasitics determine
the component’s frequency characteristics.
For
inductors, parasitic capacitance causes a typical frequency response behavioral
change. Due to the parasitic capacitance (Cp), the inductor has a maximum impedance
point at the SRF (where wL
= 1/(wCp).)
In the low frequency region below the SRF, the reactance is inductive. After
the resonant frequency, the capacitive reactance due to the parasitic capacitance
is dominant. The SRF determines the maximum usable frequency of capacitors and inductors.
DC
bias dependency is very common in semiconductor components such as diodes and
transistors. In the case of cored-inductors, the inductance varies according to
the DC bias current flowing through the coil. This is due to the magnetic flux
saturation characteristics of the core material. Inductors are conductive at DC. Often a DC current dependency of inductance needs to be measured.
J&K
Audio Design
29/12/2013
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