If you ask what we have seen winding way? As a peer PCB engineer can typically easily answer the following: 3H / 5H winding, a large wave / small wave winding, the source / end winding and the like. But if you know following this winding way, Mr. high-speed simply impress you, oh!
In the end is kind of how Mr. Gao Su winding method can get the attention it? Mr. high speed have felt we look in the eyes, but let Li once again selling off the child before Ha, let's review the classification of several well known winding.
From the sub-type, well known generally divided into a large wave and a small wave winding.
From the detail points, but also the source and the end of the winding, such as the source and the tip end of the following large wave winding.
Before article also introduced, in fact, the effect of different winding pitch will be far worse, as if following 3H / 5H / 7H winding.
Of course, it comes 3H / 5H / 7H winding, it still belongs to a small or large waves inside the wave details remain the same, but there are different effects on electrical properties, especially for the delay, there is simply damage indelible. 3H winding manner can have dozens of different ps so than when 7H. Originally winding is to delay, but did not think about myself are poor farther around you suspect life.
3H really very, very poor, 7H very much a waste of space, how to do it? no solution anymore! This was finally sold off the child does not go on. Relative to our conventional way of winding, the industry is given below this winding way a little bit creative, we commonly known as "zigzag" wire. Students can be seen at the screen point nod fiercely Kazakhstan, Mr. high-speed'll know it.
Of course, this is not the invention of high-speed sir, for this application but we also said he was very interested. No reason to go out of this whole line, certainly relative to conventional wiring advantage, then how fun things will let Mr. high-speed, so there has been a test board to find out, we compared the object is the conventional winding method.
From the insertion loss and return loss look like the above do not see much difference.
From the impedance of view, to see the difference between them can be seen in the case of the same width, the winding part of routine trace impedance will reduce travel time and zig-zag line impedance and not winding basically the same of. (Manufacturers to control impedance of 50 ohms to about 52 ohms.)
But we know that the need for wound modules are generally some of the parallel interface, traces rates are not going to 10G, 25G so, the most common is DDR modules, the rate is generally about 2G. In fact, no impact in this band, a few ohms impedance signal changes almost. So the key to the place, by far the most influential places is certainly delay! In this one they flew separation of high and low. They are the same length, the time difference reaching the receiving end more than 30 ps, which is by this zigzag winding method capable of winding the conventional run faster time to fill back up.
Well, for this type of source synchronous signal while receiving the most attention to this point, that is, the arrival time to the same, it seems that creative zigzag traces not only looks new, the effect is very good.
Have been talking about this get out of class should be able to, but also want to test high-speed sir, this zig-zag line and do not take the delay difference winding make? Why winding, be sure it is because there is a wound does not require the presence of traces thing, and so it also makes sense to compare.
Similarly, test data show that the difference in zigzag lines and do not go winding is already very, very small.
Edit: hfy, read full text
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