All Questions
Tagged with differential lvds
44
questions
1
vote
1
answer
89
views
Layer stack up and impedance matching- 100 ohm
I have a 14 layer stack up as follows (the stack up is from EURO circuit):
I need to provide 100 Ohm differential impedance for my LVDS on layer 7, currently by the information from the manufacturer (...
- 511
2
votes
1
answer
94
views
Can I set LVDS permanently to HIGH or LOW with this simple circuit?
I have a chip with 14-bit LVDS input data lines (DATA0P/N to DATA13P/N) on the chip DAC3174. I don't have enough space left to route all these data lines, so I chose to set the two least-significant ...
- 96
5
votes
3
answers
154
views
Is a gap needed with LVDS with metal layer below it?
I have a 1.8 V, 350 MHz, 100 Ω LVDS signal on an FFC on the bottom plane. Below the FFC is an aluminum metal layer; the aluminum is pretty much unconnected from the FFC. The air gap/solder mask gap is ...
- 84.8k
0
votes
0
answers
41
views
M-LVDS differential signals through multiplexers
I'm experimenting with M-LVDS via USB 3.1 cables, passing the differential signals through the SuperSpeed lanes. I'm using the DS91M040 for driving M-LVDS. So far no issues, however, I need now to ...
- 423
-1
votes
1
answer
270
views
Low-Voltage Differential Signalling (LVDS) not working
I have updated the schematic and hopefully included all the suggestions.
The problem of the LED strip flickering is still there, however, I have noticed a slight improvement after altering the circuit ...
- 1
6
votes
2
answers
946
views
What is the difference between PN- and PM- Differential pairs?
I am looking in the past recent weeks in a lot of datasheets and I see PM labels for LVDS (Low voltage differential signals) or generally Differential pairs on the Block Diagram. Altium would ask me ...
- 96
0
votes
3
answers
125
views
What are the most effective techniques for reducing the negative effects on differential pairs routed on top of two different ground planes?
I have an FMC Card with analog circuitry containing channels. I've separated the ground for these analog channels into two distinct planes: AGND and PGND.
PGND serves as the ground for the power ...
- 614
0
votes
0
answers
104
views
Connecting LVDS to oscilloscope using ferrite bead to isolate GND/SHIELD
I want to measure LVDS signals with a scope.
Will my solution work? (Shown at bottom.)
I know of other ways of doing this, but I am hoping this way is cleaner and easier.
Specs:
Frequency:~100MHz
...
- 683
2
votes
3
answers
2k
views
What are the recommended CK, DQ, DQS, ADDR impedances for LPDDR4?
I am using a micron part with LPDDR4, in many datasheets from micron there are no references to a specific impedance for CLK, DQ, DQS, ADDR. The datasheet mentions that the LVSTL is tuneable, but what ...
- 84.8k
1
vote
2
answers
2k
views
LVDS voltage levels
LVDS terminology can be a bit confusing when noted that Vcm typically is 1.2V and Vd 350mV. Does this mean 350mV as in +/-350mV so (Vin+ - Vin-) is (2*350mV) or overall swing (peak to peak of a ...
- 379
0
votes
0
answers
119
views
Formula for coupled stripline of 100 ohm
I am designing a PCB which involves MIPI and LVDS routing.
What is the formula to calculate the impedance of asymmetric coupled stripline for MIPI and LVDS routing (100 ohm)? The required calculator ...
- 61
2
votes
0
answers
395
views
Is it possible to convert LVDS (TI DS90c241/124) differential signals to optical signals?
I have a circuit that uses the TI DS90C241 DS90C124 serdes pair to serialize 24bits of data from one board to the other. Either due to electrical interference or the transmission media's ...
- 21
4
votes
1
answer
3k
views
Purpose of split termination in differential pairs
Can anyone tell me what the purpose of split termination is in a differential pair?
If you look at the LVDS article on Wikipedia, you'll see the 100 Ohm termination resistor in parallel across the two ...
user224284
0
votes
0
answers
100
views
How can I bridge across a change in differential impedance?
In a design I'm working on, I have a 100Mbps differential signal traveling from a chip on one PCB to a chip on another PCB. For various reasons, I can't make the differential impedance the same on ...
- 27.5k
0
votes
0
answers
325
views
One Differential end into Single Ended Input
I am trying to test a LvPECL signal into a LVDS receiver (NI 6583). Unfortunately, I currently only have the single-ended segment/connector. Looking at the spec, the single ended receiver should still ...
- 111