Questions tagged [crosstalk]
A phenomenon in which a signal on one circuit induces undesirable effects on another circuit.
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How to properly model biased photodiode circuit with cross-talk
The overall goal is the following: I need a board with two photodiodes, each with a bias tee (cutoff around 70 MHz) connected to it, for a total of 4 outputs. The photodiodes will see short pulses, ...
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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 ...
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Why is inductive coupling negligible at low frequencies?
I've been reading some papers from the early telephone era. I see a lot of statements thrown around like "crosstalk at low or voice frequencies, where inductive coupling is negligible..." ...
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What is the right way to avoid crosstalk of different analog channels?
I'm designning a board including three channels of light pulse detection, each channel contains TIA and FDA:
During test, I found large pulse on one channel will cause some crosstalk on other two ...
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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 ...
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How can I avoid this crosstalk issue?
I have cutout a piece of my PCB that generates the crosstalk (I measured with multimeter.)
In the middle I have a 3.3 V boost/buck converter which generates power for my ESP32. On the left there is a ...
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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 ...
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Need help with circuit for buffering DAC output for low voltage/ moderate current application near 25 Hz, without crosstalk
I have some custom linear force probes I need to be able to control for a lab experiment. They're essentially just a big coil combined with a spring that deflects up or down based on the voltage put ...
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Crosstalk: How is the victim node voltage increasing through the leakage current?
Can someone explain how this circuit is working? How is the victim node voltage increasing through the leakage current?
Here is the image for more context:
(Source: Team VLSI - Crosstalk Noise and ...
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Crosstalk on multiplexer ADG408
I'm building a 64:1 multiplexer, using 9 ADG408s (64:8:1). Last night, I had one of the chips on a bread board and was taking some measurements.
Everything worked as expected, except I observed a very ...
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How does an aggressor raise/drop the voltage of the victim in crosstalk?
I have been trying to understand, intuitively and physically, how crosstalk works. If I have a net that is switching (from either LO to HI or from HI to LO) running adjacent to a static line (LO or HI)...
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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?...
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STM32 Nucleo board, "crosstalk" between switch buttons
There are 3 switch buttons on a regular solderless breadboard each following this diagram:
Upon pressing any of the buttons, I am getting spurious breakpoint hits inside the ISRs for the other two as ...
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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 ...
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Why is my serial connection transmitting slightly incorrect characters?
I have four configurations I'm testing, and one of those configurations is showing symptoms of incorrect transmission in one direction only (from my laptop terminal to the server).
Direct connection ...
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Analog track parallel to PWM: crosstalk issues?
I'm designing a PCB for my caving robot, which mainly consists of a STM32F723ZE and 16 motor controllers, with current measurement.
My question is: can I route the PWM signals going to the motor ...
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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 ...
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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 ...
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RF line: routing it orthogonal over SPI digital signal lines
SPI will be kept below 1MHz. RF signal is under 434 MHz. Is this crossing fine through the big zero ohm resistor ?
Side question: will the outermost SPI line (it is the chip select one), or any of the ...
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Simulating crosstalk and reflection waves using the same lumped RLCG circuit in LTspice
Is it possible to add line delay to an RLCG type circuit? Using this type of circuit, I'm able to simulate capacitive and inductive coupling, but no reflection waves. Using a SPICE tline, however, ...
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Near end crosstalk saturation in a microstrip transmission line
I am referring to a microstrip PCB transmission line. I simulated the crosstalk situation using Hyperlynx.
Please see the below circuit:
I kept increasing the trace length and measured the crosstalk ...
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Implement a voltage feedback method to reduce the crosstalkin resistive matrix
I'm new in electronics and i want to develop a resistive matrix that is pressure sensitive. Right now, I have a 7x7 matrix and I'm implementing this using multiplexers, a reference resistor and an ...
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What're the differences between eddy current, current generated in electric power generator and inductive crosstalk generated between adjacent lines?
I am studying the operation of Q3D, and found the terminology mutual resistance used in Q3D. From the Help document, it describes loss due to eddy current is modeled in mutual resistance. Combined ...
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How to surpress coupling between two circuits
I have the following setup:
2 piezo transducers are placed 0.7 meter apart from eachother in water facing eachother. 1 piezo (PA) acts as the sender, the other piezo (PB) acts as the receiver.
PA ...
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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 ...
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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 ...
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If I use twisted pair cable for I2C, should I twist SDA with SCL or both with the ground/power?
I need to design about 1 meter cable for I2C communication. It contains 4 wires, SDA, SCL, ground and power. I plan to use the shielded cable with the shield grounded at one end only.
It looks ...
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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 ...
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UART Issues with MCP39F511
I've been trying to debug a UART communication issue on a custom design based on ADM00667 development board where there are only a few minor changes.
I have the dev kit hooked up to an nRF52840 BLT ...
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Low crosstalk opamps (Burr-Brown)
I stumbled across some information about an opamp on the Texas Instruments Site, the OPA1604 and in the datasheet it says:
These devices also feature completely independent circuitry for lowest ...
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Can the intelligence message of an FM signal be cross-modulated onto another FM signal due to nonlinearities?
Can the intelligence message of an FM signal be cross-modulated onto another FM signal due to non-linearities?
Where I work, we have several FM two way repeater radio sites.
Over the years I've heard ...
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Only using ground fill on RF portion of PCB
I'm designing a 4-layer PCB that has RF components and digital components. I've decided to use a ground fill only on the portion of the PCB with RF components in order to increase isolation between ...
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Crosstalk between transmission lines
I was reading these slides about crosstalk between transmission lines. At page 6 there is this circuital model to describe the effect of mutual coupling between these two lines:
My doubt is: why \$I_{...
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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 ...
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Wiring for stereo mic using MAX9814
My goal is to test some algorithms for sound localization, so I connected two microphones (MAX9814 boards from adafruit) to my soundcard. In the future I want to use four channels.
I wired them like ...
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When is a uC power supply "smooth enough" e.g. when some noisy (inductive, switch) load is around?
I'm building a battery/solar-powered 12V thingy that has an ESP32 microcontroller (5V generated from the 12V) and PWMs a 12V pump. The pump produces all sorts of voltage spikes on the 12V, and I'm ...
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Crosstalk between signal lines
I'm intending to capture the signal lines of an audio mixer (XLR, 16 channels).
Each channel can be a microphone (order of mV range), or line signal (upto around 1 V).
I want all lines (16 channels ...
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How to simulate a simplified model of crosstalk effect in LTspice?
How can I make simple model and simulate the crosstalk between two adjacent channels of a multiplexed DAQ inputs? I observe that in its most exaggerated form, a nearly exact duplicate of one channel ...
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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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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 ...
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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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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 ...
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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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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 ...
