Questions tagged [lvds]

LVDS stands for Low Voltage Differential Signalling. It is a popular high-speed (>100 Mb/s) way to connect chips.

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Is Propagation Delay affected by signal frequency?

I'm using some line drivers(lvds) on a project and I have two signals that are propagating consistently differently. Signal A is about ~71Mhz and arrives consistently slower than Signal B which is on ...
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2answers
4k views

EMI Filtering on LVDS lines

This question is slightly related to: What's radiating on my PCB? These are Beckhoff's EtherCAT industrial IO modules. Each module is connected to its neighbours by 100mbps LVDS. Each module contains ...
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3answers
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Correct place to attach shields for twisted pairs

I have two PCBs connected by a cable containing 5 sub-cables: 6v power through a custom made coaxial cable (similar to that found on laptop power supplies). 2x 100mbps LVDS through 100ohm impedance ...
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2answers
33k views

Connecting old webcam via USB

I have removed the webcam (Chicony CNF-9157) from an old laptop with the intention of connecting it up to a computer via USB. The webcam and the LCD were connected to the motherboard by LVDS. ...
1
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1answer
808 views

how does bi-directional differential signalling work?

I've always thought that differential signalling was a single-sender, single-receiver, one direction architecture. However, I've come across an SDRAM chip where DQS strobes are differential and ...
3
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1answer
520 views

networking platform to meet the IEC61850 sampled value requirements

I've developed a linux based simulator of the IEC 61850 sampled value publisher, even with RT linux I still can't meet the requirement to publish a message with MTU =-1500, every 1uS on a PC platform. ...
6
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2answers
458 views

Issue with TI comparator

I'm having trouble with a comparator from TI (LMH7322). I use it in the circuit shown in the attached image "Comparator_1". Outputs go to an FPGA. The circuit is supposed to take a single ended input ...
3
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1answer
679 views

Corrupt LVDS Display

We are using an Advantech PCM-3363 PC104 board to drive a NLT Technologies NL10276BC13-01C LVDS Display in an embedded device. While everything works fine usually, the display sometimes is corrupt. ...
2
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1answer
860 views

Signal reflections at the driver?

This question is related to How do I use directional couplers on a differential signal? I understand that if I have an impedance mismatch at the end of a signal cable, E.G. from a terminator which ...
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2answers
854 views

How do I use directional couplers on a differential signal?

I understand how a directional coupler can be used to measure signals travelling in one direction on a wire. What I don't understand is exactly how this would work on a differential signal, E.G. LVDS (...
10
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1answer
3k views

Homebrew differential 'scope probe

I may be able to get my hands on an old 600MHz LeCroy oscilloscope. However, it doesn't have any probes. Is it feasible to make an active differential probe for it using a high-speed op-amp, like the ...
7
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1answer
809 views

Microstrip over power plane

I am designing a 4-layer PCB with 16 channels of LVDS (differential signalling, 480MHz). My layer stackup is Signal-GND-Power-Signal. A microstrip design for the LVDS channels is usually traces over a ...
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3answers
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Measuring impedance

I am designing and building circuits which use 100Mb/s on a Low Voltage Differential Signaling (LVDS) bus. Some of these signals need to travel between PCBs on hand made cables. The problem is that I ...