Questions tagged [serpentine-trace]
meandering traces so designed in order to match the propagation times of two or more signals on a PCB. Also called meandering or trombone traces in the literature; less formally called wiggle or squiggle traces.
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questions
2
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1answer
93 views
Differential Pair Length Matching
I am routing a 16 bit ADC chip, the LTC2217 (datasheet) to FPGA. Each bit is an LVDS pair and I know +/- of the pair should be the same length but what about from pair to pair? I have 2 of these chips,...
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votes
1answer
148 views
Serpentine PCB heater size calculation
So, I'm kinda new to the field and the time has come to design my first PCB heater. The main concept is to drive it using a Raspberry Pi and a temperature sensor as feedback.
Here is the whole ...
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vote
3answers
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differential pair impedance and length matching
I'm designing a high speed circuit (MIPI-DSI) so I have to carefully layout the tracks. Correct track impedance is the first point usually made in various online sources I've found on the subject, so ...
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vote
1answer
2k views
Why do some PCBs have zig-zag tracks? [duplicate]
I've seen many boads with weird zig-zag shaped tracks just like the one below. Why are they designed like that?
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votes
2answers
254 views
Designing PCB for fast data
I'm trying to connect multiple components (same components) to an FPGA output. The FPGA runs at 30Mhz and transmitting both a clock and data on lines connected to these similar components.
Each ...
4
votes
2answers
365 views
Why do serpentine traces (supposedly) entail decreased ESD immunity?
In an Intel guideline for their 82579 Gigabit Ethernet controller I've read (p. 18) that a side effect of using serpentine traces on the MDI (which carries the actual Ethernet signals) leads to ...
9
votes
2answers
10k views
Length Matching Differential Pairs
I am routing a PCB with an Ethernet connection and I am having a bit of trouble deciding on how best to route the TX and RX differential pairs. I have done the impedance calculations to figure out the ...
32
votes
2answers
13k views
Purpose of “wave shaped” PCB traces
On some PCB designs, specific traces are routed in curious ways. This probably has to do with high frequency design considerations and general signal behavior that I am not familiar with.
Let's take ...
10
votes
3answers
9k views
Question about trace length matching patterns for high speed signals
A colleague and I had a discussion and a disagreement about the different ways high speed signals can be length-matched. We were going with an example of a DDR3 layout.
All the signals in the ...
38
votes
2answers
6k views
Why wiggle nearby tracks on a PCB?
I've been reading an article (TheMagPi eMagazine) relating to the Raspberry Pi; "An ARM GNU/Linux box for $25."
In the article, page 17 at the bottom it shows an area on the Pi where a track zigzags ...
6
votes
2answers
3k views
How should I lay out timing matched traces?
Two nets on my PCB need to be matched to within 100 mil, preferably 50 mil.
Currently I am doing this (see below); they are matched to about 10 mil.
However I am worried about whether I am Doing It ...
23
votes
1answer
3k views
What is this squiggly trace for?
It's on pin 14, which is the master clock input (MCLK) of a WM8761: Low cost stereo DAC. I'm guessing it's meant to act as a small inductor? But why would you want that on a clock input?
