The frequency of the digital circuit is high, the sensitivity of the analog circuit is strong, for the signal line, the high-frequency signal line is as far away from the sensitive analog circuit device as possible, for the ground line, the whole PCB has
In principle, right-angle wiring will cause the line width of the transmission line to change, resulting in impedance discontinuity. In fact, not only right Angle wiring, ton Angle, acute Angle wiring may cause impedance changes.
In circuit board design, we are usually very concerned about the quality of the signal, but sometimes we usually limit the research on the signal line, and the power and ground as the ambition of the situation to deal with, although this can make the ques
For those devices that are easy to produce noise, small current circuits, large current circuit switching circuits, etc., should try to keep it away from the logic control circuit and storage circuit (ROM, RAM) of the single chip computer, if possible, th
On a mobile phone PCB board, it is usually possible to place the low-noise amplifier circuit on one side of the PCB board, and the high-power amplifier on the other side, and finally connect them to one end of the RF antenna and the other end of the baseb
the idea that thin films can be used to give mechanical strength or adequate insulation to individual parts inserted into printed circuit boards is wrong. The components must be mechanically inserted and must have their own suitable caulking agent, so tha
Especially in sophisticated analog systems, special attention should be paid to the adverse effects of the temperature field generated by these devices on the fragile pre-amplifier circuit.
the core board (GND to POWER) should not be too thick to reduce the distributed impedance of the power supply and ground plane; Ensure the decoupling effect of the power plane.
BGA rework tool1.Since the temperature of the solder pins of the chip is always higher than the temperature of the overall circuit board, the unevenness of infrared heating at the bottom will cause the deformation of the circuit board, causing the solder
Higher signal frequency, steeper edge, smaller printed circuit board size and higher wiring density make the influence of crosstalk in high speed PCB design significantly increase. Crosstalk is an objective problem, but if it exceeds a certain limit, the
In the reverse design or maintenance of electronic equipment, electronic engineers first need to understand the connection relationship between the components on the unknown printed circuit board (PCB), so they need to measure and record the connection re
Summary of common printed circuit board standards1. IPC-ESD-2020Joint Standard for the Development of Electrostatic Discharge Control Programs. Includes the design, establishment, implementation and maintenance necessary for an ESD control program. Provid
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