Detailed Explanation Of Basic Knowledge Of Impedance Matching

The Main Characteristic Parameters Of Inductance

Following shared by the Function Generator Manufacturer.

Inductance L

The inductance L represents the inherent characteristics of the coil itself, independent of the current. Except for the special inductance coil (color code inductance), the inductance quantity is generally not specially marked on the coil, but marked with a specific name.

Inductance XL

The resistance of the inductance coil to ac current is called inductive XL in ohms. It is related to the inductance L and the ac frequency f as XL=2 PI fL.

Quality factor Q

Quality factor Q is a physical quantity representing the coil quality, Q is the ratio of inductance XL and its equivalent resistance, that is, Q=XL/R. The higher the Q value of the coil, the smaller the loss of the loop. The Q value of the coil is related to the direct current resistance of the wire, the dielectric loss of the skeleton, the loss caused by the shield or core, and the effect of high-frequency skin effect. The Q value of the coil is usually tens to hundreds. Q value of the coil can be improved by using magnetic core coil and multiple thick coils.

Distributed capacitance

The capacitance between turns of the coil, between coil and shield, and between coil and plate is called distributed capacitance. The existence of distributed capacitance reduces the Q value of the coil and makes the stability worse, so the smaller the distributed capacitance of the coil, the better. The distributed capacitance can be reduced by segmental winding.

Margin of error

The difference between the actual value of the inductance and the nominal value divided by the percentage of the nominal value.

Nominal current

Refers to the current allowed through the coil, which is usually represented by letters A, B, C, D and E respectively. The nominal current value is 50mA, 150mA, 300mA, 700mA and 1600mA.

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