High frequency  of PCB assembly china components

At high frequencies, the distribution of inductance and capacitance of pcba assembly leads, vias, resistors, capacitors, and connectors cannot be ignored. The distribution of capacitance and inductance cannot be ignored, and the distribution of inductance and capacitance cannot be ignored. Resistors reflect high-frequency signals, and the distributed capacitance of the leads plays a role. When the length is greater than 1/20 of the corresponding wavelength of the noise frequency, antenna effect occurs, and noise is emitted outward through the leads. The via of pcba assembly causes a capacitance of approximately 0.6pf. The packaging material of an integrated circuit itself introduces 2-6pf capacitors. A connector on a circuit board has a distributed inductance of 520nH. A 24 pin integrated circuit socket with dual row straight insertion, introducing 4-18nH distributed inductance. These small distribution parameters can be ignored for microcontroller systems operating at lower frequencies; Special attention must be paid to high-speed systems.

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