In the last lecture, we explained to everyone that the high-frequency components in digital signals are the main reason that affect the performance of digital devices, and it is easy to form noise. Therefore, if a low-pass filter is used, the low-frequency signal can pass, blocking the high-frequency signal, thereby removing noise.
The components of the low-pass filter are an inductor (coil) and a capacitor. The inductance characteristics are as shown in the first one, and the impedance is lower relative to the low frequency part (similar to the resistance: the higher the impedance is, the harder the signal is to pass), and the higher the frequency, the higher the impedance.
Equation 1 |Z|=2π?f?L (Z: Impedance f: Frequency L: Inductance 値)
Therefore, if the inductor is inserted in series into the noise channel, the lower frequency signal component will pass easily, and the higher frequency noise component will not pass easily.
On the other hand, the characteristics of the capacitor are exactly opposite to the inductance. The lower the frequency, the higher the impedance, and the higher the frequency, the lower the impedance.
Equation 2 |Z|=1/(2Ï€?f?C) (Z: Impedance f: Frequency C: Capacitance)
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