精品国产乱码AAA一区二区_欧美日韩国产另类成人精品_中文字幕东京热女人_亚洲一区人妻视频_91天天在线播放_中文字幕免费伦费影视在线观看_看片神器不用充会员_五月婷婷中文_日本又大又粗又爽视频_国产亚洲精品a手机在线观看

With the continuous development of the times, electronic products are becoming more and more diversified, and the demand is also increasing. A qualitative change has taken place from the previous hard board to the current soft board. Sometimes the fpc soft board will require impedance, so what is the role of design impedance? Let's talk about it in detail below.

Role of design impedance

1. When the electronic equipment (computer, communication machine) is operated, the signal sent by the driver will reach the receiver through the FPC transmission line. When the signal is transmitted in the signal line of the printed board, its characteristic impedance value Z0 must match the "electronic impedance" of the head and tail components, and the "energy" in the signal will be completely transmitted.

2. Once the quality of the printed board is poor and Z0 exceeds the tolerance, the transmitted signal will have problems such as reflection, dispersion, attenuation or delay. In serious cases, the wrong signal will be transmitted and the machine will crash.

3. Strictly select the plates and control the production process, so that the Z0 on the multi-layer plates can meet the specifications required by customers. The higher the electronic impedance of the element is, the faster the transmission speed will be. Therefore, the Z0 of FPC must also be increased to meet the requirements of matching elements. Z0 qualified FPC multilayer boards are qualified products required by high-speed or high-frequency signals.