All Questions
18 questions
0
votes
2
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83
views
Inductive crosstalk mechanism for 2 lines that run parallel on the same layer
According to Faraday's law, changing magnetic field lines that penetrates the victim line must create voltage on the victim line, but if we imagine, we see lines are orthogonal to the victim trace ...
- 33
0
votes
1
answer
254
views
High-speed PCB crosstalk, inductive vs capacitive
I know that at the time of crosstalk Capacitive as well as inductive currents generate voltage drops on the victim line over termination resistors.
I have three questions.
1)Why inductive crosstalk ...
- 3,061
5
votes
4
answers
3k
views
Is it ok to have a PCB track cross another on a different layer?
PCB tracks carry electric signals and these produce magnetic and electrical fields around them. Due to these fields, the PCB tracks have inductive and capacative cross talk with nearby PCB tracks.
I ...
- 12.2k
0
votes
1
answer
164
views
Troubleshooting 3:1 Audio Muxing with Relays. Crosstalk? How to test?
I am switching between 3 audio inputs out to 1 single output. Each input has 4 signals (left and right x positive and negative). I am using 4 DPDT relays (like 8 2:1 muxes).
Inputs 2 and 3 switch ...
- 65
0
votes
1
answer
231
views
Why is mutual inductance coupling high in a microstrip PCB line?
I am learning about crosstalk on PCBs from the high-speed signal propagation book by Howard Johnson.
It says mutual inductance coupling is high in microstrip lines compared to mutual capacitive ...
- 3,061
1
vote
1
answer
366
views
Can USB 3.0 tracks be closer together than 5W if they're quite short?
I am currently laying out a space constrained PCB which contains some USB 3.0 Superspeed differential pairs. These USB signals are confined to the PCB, going from a Cypress CX3 chip to a USB 3.0 Hub ...
- 27.6k
1
vote
0
answers
280
views
Forward and Backward Crosstalk
I have some basic questions about crosstalk. My reference for this question is this website.
This website introduces crosstalk in this way:
Crosstalk is the unwanted coupling of energy between two or ...
- 3,590
1
vote
1
answer
567
views
Crosstalk between AC and DC
First time asking a question but I've come across something I just can't find the answer to. Whether or not it's because a silly question I hope to find out.
So I understand that with crosstalk ...
- 111
0
votes
1
answer
830
views
Asynchronous SRAM routing crosstalk concerns
I'm routing a large BGA SRAM that is connected to a BGA FPGA, and there's about 40 signals altogether connecting the two. I'm using Henry Ott's recommended 8-layer stackup:
1 ________________Mounting ...
- 15
1
vote
2
answers
535
views
Do I have adequate crosstalk and ground loop preventions in place?
I'm moving away from project boards for the first time and was looking to get a bit of feedback before I send my PCB design into production. I'll preface this by saying that the design itself has been ...
2
votes
4
answers
265
views
What's the point of board-internal differential pairs?
Sorry if this is an ignorant question.
But I just can't fathom what the advantages are of using a differential
pair for signals not leaving the PCB.
I mean, the usual argument for using a ...
- 211
7
votes
1
answer
1k
views
Crosstalk analysis, Altium vs. the World
I am trying to understand the real-world effect of crosstalk between nets, and I find I cannot match the data from abstract calculators (like Saturn's PCB toolkit and others) and the Altium crosstalk ...
- 917
15
votes
2
answers
4k
views
PCB Ground Pour, Crosstalk and antennas
I'm trying to understand the effects of polygon pour fills when high speed line transitions might occur. Consider the fabricated case example below:
In this example the tracks (colored in light blue) ...
- 917
1
vote
1
answer
926
views
Ways to determine approximate magnitude of crosstalk between PCB layers
Is there any basic methods to calculate crosstalk between different layers in a multilayer PCB. I am not after anything exact just a way to grasp the magnitude of the issue.
The situation I am trying ...
- 2,535
1
vote
1
answer
485
views
Crosstalk between Ethernet and Analog Signals on PCB
I am wondering the possibility of crosstalk between the two ethernet lines and an analog signal.
The ethernet will operate at 100MHz. If I place positive and negative traces in parallel and place ...
- 966
3
votes
1
answer
2k
views
PCB Crosstalk calculators... Center line distance or trace separation
I am still a beginner in this field, and recently I've learned about Crosstalk and Crosstalk calculators. I've tried the one on EEweb, Saturn, Ultracad and some others. Some of these calculators ask ...
- 41
1
vote
1
answer
181
views
Do I have to worry about backwards crosstalk with a 1 way bus?
I'm working on a DDR memory circuit, and I'm not sure how big an issue crosstalk is on the command/address bus. I've designed for crosstalk with the DQ/DQS and CLK lines because they are high speed/...
- 13
4
votes
1
answer
640
views
Crosstalk on PCB
I am currently working on a PCB with DDR2 on it. We are bringing out the DDR2 CLK, DQS signals using pogo pins to make some timing measurements. The length of the pins are about 5 cm. The problem is ...
- 41