Vias is the important constitute of PCB, the cost of drilling fee is 30%-40% of whole PCB cost.
Parasitic capacity of vias
The parasitic capacity exists in vias refer to ground layer. Assume ground layer isolate via diameter is D2, via pad diameter is D1, PCB thickness is T, dielectric constant
If you open SOC PCB Layout Guide,you can see it mentions high speed signal line’s angle question: high speed signal line don’t layout in right-angle, it should layout in 45 degree angle,and arc is better then 45 degree. How’s the truth? How to design the circuit line? 45 degree or
Follow electronics technology development,many PCBs outline became more and more complexity. New products on market require PCB outline with high accurate,also appearance is criticized.it’s difficult for traditional outline manufacture. As Laser machining have advantages like high accurate,high speed,low cost.more and more PCB manufacturers start to purchase laser equipment to solve
Bubble and overflow glue are common questions of FPC quality.Coverlay flow follow press temperature go up lead to copper pad adhesion glue like epoxy.
The reasons of glue overflow:
It involve many aspects,like coverylay protection in process,FPC factory technology parameter,environment protection,worker operation,etc.
One of reasons: Coverlay parameter when making.
When CL is coating
If the vias is too close to pad, solder will flow out through via when make reflow soldering,lead to false weld.
Countermeasure: Move vias to 0.2mm far away from pad.
This kind of question always happened to PCB design. Engineer had to save space for boards limited by dimension. But it may
Flex-Rigid PCB is mix FPC and Rigid PCB,followed special requirement and press them together. It’s compatible both of FPC and Rigid PCB advantages.enginner always use 2 rigid PCBs,a flex pcb and a switch to connect them before Flex-Rigid PCB be published.Flex-Rigid PCB have strong resistance for bad application environment,it’s good
Here two PCBs file need to combine one PCB file, it will save much setup fee for prototype.How to build one PCB file with different PCBs in Allegro?
Below is the second PCB.
We create a new PCB module.and select follow the red circle.
Save the module with mdd.then copy the second
It’s important to know factors affecting of PTH throwing power to electronics products, then improve high aspect ratio for facilitating productivity.it’s good for electronics products reliability,reduce fabrication cost,improve productivity.
PTH
Plated through hole(PTH) is the crucial process of PCB manufacture. it need be plated enough copper in wall of hole for connect
Most of PCB manufacturers use Al sheet to plug vias.We use blank net to make solder mask and plug vias after many experiences, it's stability and reliability.
As the development of electronics industry, customers put high requirements for PCB surface mounted technology.Via plugging come into being as it connected all circuits,then
In recent months,PCB material cost is continual increase lead to China PCB enterprisers are in difficult situation. Especially price soared of copper foil,copper ball,glass fibre,epoxy resin have exceeded the limit of maximum cost of printed circuit enterprises. In pass 10 years, PCB enterprises have cut the price to bottom for
