Questions tagged [crosstalk]
The crosstalk tag has no usage guidance.
8
votes
3answers
544 views
Can the reference plane for reducing crosstalk within a PCB be a power plane?
One of the most effective ways to reduce the coupling between PCB traces (to reduce crosstalk) is to put the reference plane close to the traces.
I have always used a ground plane as the reference ...
0
votes
1answer
52 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 ...
1
vote
1answer
34 views
Capacitive crosstalk switching frequency vs rise/fall time
I'm breaking my head over the frequency dependent behaviour of capacitive crosstalk. Time domain analysis seems to conflict with frequency domain analysis, obviously one must be wrong.
Let's assume ...
1
vote
0answers
76 views
Reducing electromagnetic interference in underwater acoustics cables
Our college underwater robotics team has a passive acoustics system with four hydrophones that provide an analog signal typically between +/- 200 mV corresponding to the sound wave at that point in ...
0
votes
1answer
109 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 ...
1
vote
2answers
1k views
PC Headset crosstalk
I had issues with crosstalk (microphone picking up headphones sounds) and thought it was caused by headset.
So I removed headset's original cable, put 4 pole female 3.5mm jack on the headset and ...
2
votes
2answers
140 views
Crosstalk in analog switch
Art of Electronics, 3rd Ed, pg. 179, gives a model for the capacitive coupling between independent channels of an AD7510DI analog switch. The authors ask to calculate the coupling between channels ...
1
vote
1answer
121 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 ...
0
votes
0answers
51 views
Cross talking between two touch sensors
I have built the two circuits shown below, and when I close them by touching the two sensors I observe a change in the signal recorded from the digitizer from 9 V to 0 V approximately. The two ...
0
votes
0answers
121 views
Measuring mains voltage with a 3.3V ADC
I'm trying to simplify an existing circuit that measures mains voltage. I have a 0-3.3V ADC and 5V and 3.3V DC power supplies (the negative sides of which are unavoidably tied together). The part I'...
0
votes
1answer
53 views
Would crosstalk be an effect at < 1 kHz signals up to 2.2A?
I'm planning on the use of a current transducer to monitor the current of an induction motor (full load amperage = 2.2A @ 60 Hz).
(Link of current transducer, model: LTS 6-NP)
If I connect the input ...
2
votes
3answers
245 views
Audio Transformer Orientation on PCB
I am working on a project using two audio transformers for two separate circuits mounted very close to each other on a pcb as shown in the image. With the transformers as mounted, there is a bit of ...
5
votes
2answers
586 views
Routing USB, DVI and Ethernet signals on a large PCB vs using long cables
Properly routing USB, DVI and Ethernet signals over long distances (30 to 40 cm) on a PCB seems to be relatively challenging (skew, characteristic impedance, cross-talk, etc.). Yet using the standard ...
2
votes
3answers
326 views
Is cross talking caused by cables acting as antennas?
Why does cross talking happen between different cables? Is it because any electrical cable has the capability to act as an antenna?
And most important, why do twisted pair of cables have less cross ...
5
votes
3answers
2k views
Can GPIO pins interfere with each other?
I have a simple circuit where I bitbang I2C (SCL/SDA is GP5/GP4) on a pic 12F629. It works perfectly, all the timings are correct, no errors etc. The exact schematic is irrelevant because I ...
0
votes
2answers
305 views
Crosstalk through I2C
I'm using an Arduino to communicate with I2C magnetometer sensors. The parts list and a basic block diagram of the wiring is shown below:
HMC5883L Magnetometer:
https://learn.adafruit.com/adafruit-...
0
votes
1answer
500 views
Audio mixing : crosstalk calculation
Here is an interesting article about mixing stereo.
Most important issues when mixing stereo are :
interaction between channel
crosstalk
noise
Interaction between channel is explained here in 1.0 ...
0
votes
2answers
106 views
Crosstalk issues with Photomultiplier Circuit
I'm working on a circuit involving Silicon Photomultipliers. Two SiPMs are in parallel together, and they go to a feedback amplifier circuit where the current signal gets filtered and converted into a ...
0
votes
3answers
105 views
Do wires need to share similar characteristics in order for crosstalk to occur?
My understanding of crosstalk is how a radio transceiver works. You basically tune your transmitter and receiver to a similar frequency in order to get a cross-coupling of energy (the transmitter's ...
2
votes
3answers
351 views
How to generate crosstalk between 2 wires?
I'm trying to recreate a situation where crosstalk is occurring. I'm having a bit of trouble trying to inductively cross couple two parallel wires that don't have any shielding or insulation and aren'...
0
votes
1answer
176 views
HTN LCD - Ghosting Problem
I am driving a large, complex HTN LCD with 3 Holtek HT1625 LCD drivers. There are over 700 segments.
The data sheet for HT1625 LCD driver is here:
http://www.holtek.com.tw/documents/10179/116706/...
5
votes
3answers
1k views
Distance between SPI traces to prevent cross talk
I'm wondering, what is the rule of thumb regarding the distance between the SPI bus (MISO,MOSI,CLK,nCS). How to make sure there is no cross talk from one trace to other trace?
I guess the frequency ...
2
votes
4answers
142 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 ...
-1
votes
1answer
85 views
When simultaneously running a stepper motor and an induction motor, the stepper stalls when the induction motor is braking. Ideas?
I am running an induction motor and a stepper motor simultaneously through a driver board I designed. The board has a dual H-bridge for driving a bipolar stepper motor, and an inverter for driving the ...
0
votes
2answers
466 views
Using twisted pair with Arduino Mega [closed]
I have done a previous project where I used an Arduino Mega to control a Three-phase industrial metal pattern scrolling machine (bender), and I faced many problems with noise voltage spikes being read ...
1
vote
2answers
756 views
How do I Analyze Crosstalk in an Unbraided Multi-Cable?
Near-end crosstalk (NEXT) and far-end crosstalk (FEXT) are defined for twisted cable pairs [1], while both FFT and Baum-Liu-Tesche equations have been applied to analyze crosstalk in bidirectional ...
2
votes
2answers
155 views
Minimizing capacitive crosstalk in open collector quadrature speed sensor
I am integrating a speed sensor (Honeywell SNDH-T4L-G01) which comprises 4 lines: VDD, VSS, A, B. The last two signals provide speed and direction information in a quadrature format.
These are open ...
5
votes
1answer
600 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 ...
11
votes
2answers
2k 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) ...
0
votes
3answers
2k views
Hardware buttons debouncing crosstalk
I'm using a hardware-based debouncing circuit to trigger an interrupt on a Particle Photon development board.
I use a similar circuit with two buttons:
Sometimes when a button is pressed, the ...
1
vote
0answers
296 views
Simple Interconnect circuit to simulate crosstalk in ltspice
I want to implement a very simple interconnect circuit to simulate crosstalk in ltspice because I am new to this area of crosstalk. Where can I find such a design? I have searched in the net but all ...
0
votes
1answer
378 views
Cable-to-cable crosstalk (Capacitative Coupling)
I'm having some difficulty understanding the solution to this question.
Compute the cable-to-cable crosstalk due to capacitive coupling in a
harness between two cable pairs having an average ...
1
vote
1answer
477 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 ...
1
vote
1answer
370 views
Crosstalk Question
Could somebody explain me how could I predict the crosstalk between tracks.From what I know about this are two types of crosstalk: inductive and capacitive.Inductive from what I read is the worst.For ...
1
vote
1answer
317 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 ...
-3
votes
1answer
151 views
Is a passive analog “summer” fine, if the output voltage is guaranteed to be lower than the input voltage?
Suppose that the voltage sources only goes to the analog summer described after. The voltage sources have enough negative DC bias to put voltages to be negative. Since negative plus negative is ...
0
votes
2answers
995 views
Why active analog summer (adder) over passive summer exactly?
Background: Designing voltage summer without op-amp and Operational Amplifier Adder
I know that op-amp can provide virtual ground for the circuit, and can have benefits in eliminating crosstalk. But ...
0
votes
1answer
263 views
How can a signal backfeed and create a crosstalk in a passive summation circuit?
...a passive summation circuit can be a simple way to
combine signals but one disadvantage is that the summed signal will
backfeed into each of the sources. This could be an issue if you
wanted ...
7
votes
4answers
558 views
Why does my rectangle function on a FPGA look like this?
I programmed my FPGA to create a simple 1 MHz rectangle function. But when I display the resulting function on my oscilloscope it shows some oscillation after the edges.
At first I thought this might ...
2
votes
1answer
1k views
Headset input crosstalk, or how to mitigate the effects of common ground resistance
I am building a cable to connect a guitar (or a piezo) and headphones to the TRRS connector of a smartphone through 4-wires cable splitting at ~1 mt from the connector.
I am experiencing a ...
1
vote
1answer
50 views
Is it a good idea to landfill using alternating power rails?
That is, for example, filling the top layer of a 2-sided board with ground and the bottom with power rail.
Will this form a big decoupling cap across the board, or will it give me horrible crosstalk?
2
votes
3answers
616 views
High-speed clock line crossing under data lines
I'm interfacing an SDI video de-serializer with an HDMI transmitter. The de-serializer splits the video signal into 20 parallel lines and one clock line.
Because the digital video data is high speed (...
2
votes
1answer
393 views
Will crosstalk be induced if signal running in parrallel to power trace?
I haven't come across any mentions of signals running in parallel with power traces. Everyt mention thus far has been two signals to each other.
If I have a low amplitude signal (sinusoid < 10khz)...
3
votes
1answer
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 ...
1
vote
2answers
513 views
Avoiding crosstalk between makeshift wires
My setup is as follows. I have 6 foot long 22-gauge wires connecting pin headers of an audio codec eval board and an FPGA daughterboard. I am sending an 8KHz and 128KHz clock signals and a data signal ...
0
votes
1answer
136 views
ATMega32, Using PORTA as digital io has digital “crosstalk”
I have multiple switches connected to portA on an atmega32. They are set as an input with internal pullups. There are no external pullups. The switches ground out the pins. I'm not debouncing the ...
3
votes
1answer
582 views
What are the differences between Channel-to-Ground & Channel-to-Channel isolation?
I have the following questions regarding different types of isolation techniques:
What are the major differences between Channel-to-Ground & Channel-to-Channel isolation techniques?
Are all Ch-to-...
6
votes
1answer
528 views
Running JTAG chain over busy backplane
We are busy designing a large system with around four PCBs slotting into a backplane. Each PCB could contain a DSP as well as a large FPGA. We would like to run 2 JTAG chains through the system, one ...
1
vote
1answer
155 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/...
8
votes
3answers
1k views
How to diagnose crosstalk
I am completely new to electronics, and am trying to learn by building an electronic drum set. I've found lots of examples online of circuits to condition the output from a piezo to be read by a ...
