PCB News - Talking about why the PCB circuit board needs to be impedance

Talking about why the PCB circuit board needs to be impedance

Circuit board manufacturers talk about why PCB circuit boardsneed impedance?

PCB circuit board impedance refers to the parameters of resistance and reactance, which hinder the alternating current. In the production of PCB circuit boards, impedance processing is essential. So do you know why the PCB circuit board needs to be impedance?

1. The PCB circuit board (bottom of the board) should consider plugging and installing electronic components. After plugging, the conductivity and signal transmission performance should be considered. Therefore, the impedance control is required to be as low as possible, and the resistivity should be less than 1 per square centimeter. *10-6 or less.

2. In the production process, the impedance circuit board has to go through the process of copper sinking, electrolytic tin (or chemical plating, or thermal spray tin), connector soldering and other processes, and the materials used in these links must ensure that the resistivity is low, in order to ensure The overall impedance of the circuit board is low to meet the product quality requirements, and it can operate normally.

3. Tinning of impedance circuit boards is the most prone to problems in the production of the entire circuit board, and it is a key link that affects the impedance board. The biggest defect of the electroless tin coating is easy discoloration (easy to be oxidized or deliquescent) and poor solderability, which can lead to difficult soldering of the PCB board, high impedance, poor electrical conductivity, or instability of the overall board performance.

4. There are various signal transmissions in the conductors in the impedance circuit board. When it is necessary to increase its frequency in order to increase its transmission rate, if the circuit itself is different due to factors such as etching, stack thickness, wire width, etc., the impedance value will change., So that the signal is distorted and the performance of the PCB board is reduced, so it is necessary to control the impedance value within a certain range.

I believe everyone is already very clear about why the PCB circuit board needs to be impedance. PCB circuit board impedance will directly affect the stability and performance of the circuit board, so in order to ensure the overall performance and quality of the PCB circuit board, impedance is needed.

iPCB is a high-tech manufacturing enterprise focusing on the development and production of high-precision PCBs. iPCB is happy to be your business partner. Our business goal is to become the most professional prototyping PCB manufacturer in the world. Mainly focus on microwave high frequency PCB, high frequency mixed pressure, ultra-high multi-layer IC testing, from 1+ to 6+ HDI, Anylayer HDI, IC Substrate, IC test board, rigid flexible PCB, ordinary multi-layer FR4 PCB, etc. Products are widely used in industry 4.0, communications, industrial control, digital, power, computers, automobiles, medical, aerospace, instrumentation, Internet of Things and other fields.