Description
Quality Factor of an Inductor
Design at least two methods to measure the inductance and the quality factor of an inductor at a given frequency.
Figure 1: Inductor model using ideal components
As shown in Figure 1 Inductors may be considered as an ideal inductor connected in series with a resistor. Q of an inductor is de ned as:
Q =
w0L
(1)
R
Preliminary Work
Verify your proposed methods using SPICE.
Experimental Work
You will use two inductors, one will be provided to you in the lab and you will wind another inductor to a core which will be provided in the lab. Measure the inductance and quality factor of the both inductors using your methods at four di erent frequencies in the range 1MHz to 5MHz, away from self-resonance frequency. Compare your ndings. Assess the accuracy of your measurement.
Available materials in the lab
Toroidal cores to design inductors or transformers: T25-10, T37-7, T38-8, T50-7 from Micrometals. Capacitors with standard values. Resistors with standard values. LM324 (DIP package) Opamp. 10cm x 10cm PCB board pieces with no pattern (just copper on one side) to solder your components.
