Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [crosstalk]

A phenomenon in which a signal on one circuit induces undesirable effects on another circuit.

A phenomenon in which a signal on one circuit induces undesirable effects on another circuit.

See Wikipedia's article on crosstalk for more information.

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Why are two 555 timers in separate sub-circuits cross-talking? (Poltergeist in the Breadboard)

As an introduction to electronics, I am following Charles Platt's Make: Electronics (2nd edition). Every circuit worked as expected, until Experiment 17: Set Your Tone. In circuit on figure 4-37 (page 163), two 555 timers are used in astable mode…
Ad N
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Cross talk within IC package

I have learnt that on the PCB, the signal tracks must be a certain distance apart to minimize cross talk. This makes sense this we must reduce the electric and magnetic field coupling across to neighbouring conductors. I was watching some videos in…
gyuunyuu
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Ribbon Cable Cross Talk - Is there a fix after the fact?

I'm involved in a project where the customer defined pins in a ribbon cable, without considering possible cross-talk issues. The signals are 1 MHz data signals with no ground wire separating them. I've never had experience with cross-talk and was…
JHinkle
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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) were set as much apart as possible on the left…
Guillermo Prandi
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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 is playing a role here?
Itay Kalfa
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Crosstalk and EMI on a 2 layer board?

I am new to PCB designing and was wondering about cleaning up crosstalk and EMI. Can I add ground vias between signals shown in the picture or will it be fine just to remove the ground vias in general? I know that adding a ground plane between both…
Andrew Chedid
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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 plane. Could a power plane be the reference plane…
Aldanajaramillo
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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 controller (a Netduino in my case). The circuit I'm…
herbrandson
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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 be the the Fourier components, but this doesn't…
Stein
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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 chain for the DSPs and one for the FPGAs. My…
Neville Bamshoe
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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 analysis. For this sake I've made a dummy PCB…
Guillermo Prandi
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Two layer FR4 PCB: should you place GND pour on signal layer?

Talking about two layer PCB's FR4 due to lower cost: I always poured ground on both layers of the PCB, I believed "the more the ground the better", but Recently I started watching altium live presentations, and I came across this video gem to…
Christianidis Vasileios
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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 sometimes see design where signal tracks are…
quantum231
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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 off-the-shelf cables appears to allow proper…
user110091
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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 deconstructed the whole circuit to basic blocks and tested…
John
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