Electronics Engineering

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Wednesday, September 22, 2021

Guideline of Routing in PCB Design

In this article, we are going to discuss about what is guideline of Routing in PCB Design?

Guideline of Routing in PCB Design


Guideline of Routing in PCB Design

In PCB design have Routing which is the connecting of the parts that have been placed on the PCB.

In PCB Design routing has both options it could be done manually or automatically. In PCB design software has both options. Generally PCB designer do manually or (semi-automatic).

Generally in PCB design, gap between trace to trace should be 0.010″ (0.254mm) & if board is complex then would be 0.050” (1.27mm).

If PCB designer have rich experience in case then routing would be best practice to layout power and ground traces. Ground & Power trace is main trace of PCB so that these trace routing should be best as per design rules .Generally  a “rail” structure  it means try to route with  parallel ground and power traces between rows of IC’s.

Try to possible make wide trace for power 0.050” (1.27mm) and 0.100” (2.54mm) for ground, It can be generally use 0.010″ (0.254mm) for other signal traces for connecting each part to the rail but first try to make Ground and power track properly then route other signal track, Because main current flow in these track so that that’s should be proper routing with design rules.

When the PCB design then routing strategy is Main, normally route the trace on side of the board vertical and route with the other horizontal.

It is cheaper to have signal traces 0.010” (0.254mm) on a 0.005” (0.125mm) centers. Many manufacturer can do 0.004” (0.100mm) on 0.008” (0.200mm center, It can be help for PCB manufacturing.

In PCB design routing is main part of design, It means normally trace should be as short and direct as possible on PCB.

In PCB design routing try to make possible to have all signal traces starting and ending on a component pad.

In PCB design, when we make trace would snake around so much that circuit function is degraded.

If possible use pads without component leads mean use SMD components. These are called feed via which allow better routing of the board as vertical/horizontal strategy is maintained as well as minimizing signal path.

Best PCB Designer take pride in minimizing number of via, they lead to better designs and best product output.

When does the PCB design first separate the Critical signals and try to route by manually don’t do automatic after this it allows the signal trace to have less bends and via when confirmed all critical traces have done best than use auto router for minimize the time.

When do the auto router before do the auto router first Flag the trace before turning on the auto router so that it is not moved.

When design complex board then which signals is interrupted with other signal then will not be routed auto route and this signal must be finished manually.

When do the design don’t make the trace corner with 90o angle, Trace should be finished with 45o angle.

First make the Gap between power trace and signal trace because some traces are interface with power so that gap should be maintain as per power rating of trace , Minimum gap would be 1MM from main power trace and try to make more gap between power trace and signal traces.

IF PCB designer have rich experience then 95% of the board is finished by the auto router, it can be quite time consuming and tricky to finish the last 5% manually part outlines need to be trimmed to keep lines off pads and via.

 


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