On the difference of circuit board each surface treatment process
Spray tin is divided into lead spray tin (i.e. hot air flat) and lead-free spray tin. Below you can see the difference between the various processes;
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PCB "over hole cover oil" and "over hole open window", stupid can't distinguish?
Many customers use pad(plug-in holes) to represent conductive holes, thus causing your conductive holes to open the window. Then please check your document design! At this point in time,
Closed circuit type circuit
Radio-frequency radiation is a combination of this magnetic and electric field. Magnetic and electric fields leave the PCB structure by means of radiation or conduction.
The cause of electromagnetic interference in PCB and the technique of eliminating interference
In PCB, EMI can be produced for many reasons, such as: RF current, common mode level, ground loop, impedance mismatch, magnetic flux
Exposed pad on PCB
In addition, with the increase of width, PCB current-carrying capacity does not increase strictly in line with the linear increase
Effect of different thickness and roughness of copper conductor on dielectric constant
Any circuit board material used in millimeter-wave circuits should have a low TCDk value to minimize the impact of Dk changes on circuit performance (such as phase shift).
PCB circuit board cooling skills
the thermal performance index analysis software module added in some professional PCB design software can help designers optimize circuit design.
Detail PCB circuit board high frequency board and high speed board difference!
there are still some differences between high frequency products and high speed products in the demand for plate.
HDI board
At present, the use of polyphenyl ether (PPO or PPE) resin is a good development direction, whether from high frequency materials or high speed materials.
PCB manufacturing enterprises lean production thinking
TPM and other high-end knowledge, but ignore the field management, ignore the most basic production activities of the people and equipment.
PCB is mainly divided into
The following is its structure diagram (about circuit symbols and functions will be explained later) :IC design: CMOS devices and their circuits，
Circuit board machining line spacing is small
The following are the main points and points for attention in selection of PTC self-restoring fuses of overcurrent devices arranged by Shuokai Electronics.
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