Questions tagged [crosstalk]
A phenomenon in which a signal on one circuit induces undesirable effects on another circuit.
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Acceptable designing two clock generators using single package?
The circuit I usually use is Pierce oscillator:
(pic source)
I have always had single system clock in the system, built on single HCU04 chip. Now I need two: 6*NTSC and 4*PAL - frequencies not ...
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MAX11609 - Crosstalk in Voltage Inputs
So I designed a module which can read multiple voltage and current(4-20mA) inputs. This module has been designed with the use of Max11609. After receiving the PCBs and testing them, I observed a ...
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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'...
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Could shielding (not grounded) affect signal integrity?
I'm trying to shield 6 flat cables that give me some communication issues because I thought that there might be cross-talk or other sources of interference that cause the problem.
The shielding is ...
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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 ...
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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 ...
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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 we ...
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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 ...
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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 ...
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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 ...
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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'...
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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 ...
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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-...
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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 ...
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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 ...
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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 ...
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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 ...
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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'...
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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 (...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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-...
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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 ...
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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) ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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?
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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 ...
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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)...
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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 ...
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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 ...
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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 ...
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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/...
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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 ...
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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 ...
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How to prevent crosstalk between a twisted pair in a SCSI cable?
I am using a SCSI-2 Half-Pitch DB50 connector as an I/O expansion connector, due to size constraints. However, it seems as if pretty much all cables manufactured in recent years are differential ...
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Attenuation curve of the twisted pair cable
I'm searching an image of attenuation of twisted pair utp and stp for school report. I googled and I found only utp this curve!
any help?
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Crosstalk avoidance on fpc cable
I am re architecting something that works. (laser range finder). This is a cost down excercise.
In the existing system I have separate boards for laser driver and afe. Now I am combining those and ...
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