Questions tagged [crosstalk]

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

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25 views

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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43 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 ...
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45 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 ...
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33 views

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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130 views

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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106 views

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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26 views

Crosstalk Near END and Far END Waveforms

I was learning the basics of cross talk(https://www.youtube.com/watch?v=5EeQPxRdurk).I am confused about the orientation of near end and far end cross-talk wave form's.Please see the below figure. ...
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1answer
45 views

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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94 views

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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2answers
82 views

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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1answer
113 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 ...
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565 views

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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309 views

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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7answers
4k views

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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79 views

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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54 views

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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1answer
90 views

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 ...
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2answers
269 views

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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1answer
83 views

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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125 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 ...
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2answers
287 views

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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1answer
30 views

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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56 views

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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2answers
442 views

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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1answer
64 views

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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50 views

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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5k views

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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159 views

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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3answers
948 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 ...
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230 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 ...
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1answer
195 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 we ...
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186 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 ...
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1answer
529 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 ...
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3answers
11k 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 ...
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2answers
386 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 ...
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2answers
361 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 ...
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239 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'...
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1answer
71 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 ...
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3answers
561 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 ...
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2answers
863 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 ...
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3answers
852 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 ...
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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 ...
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602 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-...
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973 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 ...
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2answers
154 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 ...
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3answers
126 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 ...
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3answers
529 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'...
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328 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/...
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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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4answers
200 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 ...