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Saturday, December 28, 2013

Inductor Measurement



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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