Determine the length of the tracks on the board
A printed circuit board (PP) is the basis of any electronic device. Electronic components are installed on it. It has tracks that are traced by electrical signals between the pins of the components. To increase the density of installation and reduce the size, the boards are made multi-layered. And what is the total length of the tracks on a regular board?
As a child I loved cutting boards. Scalpel:
I also liked LA3, IE5 and ID3 chips:
')
The total length of the tracks on this board is easy to determine, I got about 0.5m.
And this is the starting point of my "research."
In the process of distributing the next board, I was surprised to find that the total length of the conductors on the board, with the exception of polygons / panels, logos, drawings and wiring on a chip chip, exceeding just over 25% is already 14m. Then I had a sporting interest, and every day I gladly noted for myself how many more meters of tracks my friend and I had made. As a result, the total length was over 45m. This is an interactive layout without a slot machine, although I don’t answer for a friend and his layout. And before optimizing the layout of memory banks, the figure was close to 48m. I’ll say right away, neither I nor my friend set goals to cut the via holes and make the wiring as long as possible.
In the end, I had nothing to do with taking statistics from 19 projects of boards that were diluted at different times, by different people, for different tasks, for boards from 2 to 20 layers, with different sizes, etc. And that's what I got:
Those. about 70% of the boards have a distance of 5 to 20m. The number of boards with a track length of over 20m was 15%. On the remaining boards, the distance did not exceed 1m. I want to note that I did not even try to relate the obtained values to the wiring density, complexity of the geometry of the conductors, the number of vias, etc. And, of course, it would be very interesting to learn about how things are with the total length of the conductors from others.
As a child I loved cutting boards. Scalpel:
I also liked LA3, IE5 and ID3 chips:
')
The total length of the tracks on this board is easy to determine, I got about 0.5m.
And this is the starting point of my "research."
In the process of distributing the next board, I was surprised to find that the total length of the conductors on the board, with the exception of polygons / panels, logos, drawings and wiring on a chip chip, exceeding just over 25% is already 14m. Then I had a sporting interest, and every day I gladly noted for myself how many more meters of tracks my friend and I had made. As a result, the total length was over 45m. This is an interactive layout without a slot machine, although I don’t answer for a friend and his layout. And before optimizing the layout of memory banks, the figure was close to 48m. I’ll say right away, neither I nor my friend set goals to cut the via holes and make the wiring as long as possible.
In the end, I had nothing to do with taking statistics from 19 projects of boards that were diluted at different times, by different people, for different tasks, for boards from 2 to 20 layers, with different sizes, etc. And that's what I got:
Those. about 70% of the boards have a distance of 5 to 20m. The number of boards with a track length of over 20m was 15%. On the remaining boards, the distance did not exceed 1m. I want to note that I did not even try to relate the obtained values to the wiring density, complexity of the geometry of the conductors, the number of vias, etc. And, of course, it would be very interesting to learn about how things are with the total length of the conductors from others.
Source: https://habr.com/ru/post/358334/
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