A simple method is presented by which high-frequency inductors can be characterized under large excitation by using a general-purpose digital oscilloscope. The method uses numerical multiplication to measure phase difference between two sinusoidal waveforms from which L and Q are calculated using phase diagram relationship. Factors affecting accuracy of the method are analyzed based on the sensitivity function. A method is also presented by which influences of parasitic elements across a current sensing resistor can be removed, The accuracy of the method is evaluated by characterizing an air-core inductor (10.1 μH) which is easily characterized by an impedance analyzer. Inductance and quality-factor (≅100) at 1 MHz were measured in good accuracy. Planar inductors using NiZn ferrite substrates are characterized at 1 MHz by this method.
|Number of pages||4|
|Publication status||Published - 1994|
All Science Journal Classification (ASJC) codes
- Electrical and Electronic Engineering