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What is the Q factor of an inductor? How to increase the Q factor?
Time: 2025-03-27
Passive components, inductors in particular, are commonly used in various circuits. However, they are also richly categorized into various types based on different properties, forms, or structures. As for how to define the Q factor of an inductor coil, that's another matter.
Passive components, inductors in particular, are commonly used in various circuits. However, they are also richly categorized; different properties, forms, or structures lead to various types. How is the Q factor of an inductor defined?
The following definitions are worth referencing. It is said that the higher the Q factor of an inductor, the better. So, how can we improve it?
First, let's understand the Q factor of an inductor. What is the Q factor?
1. Definition
The Q factor of an inductor, also known as the quality factor, is a key parameter for measuring inductors. When an inductor operates under an AC voltage at a certain frequency, it represents the ratio of its inductive reactance to its equivalent loss resistance. The higher the Q factor of an inductor, the lower its loss and the higher its efficiency.
2. Formula for Q factor
The quality factor can also be written as Q = 2π * (energy stored in the circuit) / (energy consumed in one cycle of the circuit).
The relationship between the bandwidth BW, the resonant frequency ω0, and the quality factor Q is: BW = ω0/Q, indicating that a large Q results in a narrow bandwidth, and a small Q results in a wide bandwidth.
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