All Questions
Tagged with impedance-matching differential
26
questions
4
votes
2
answers
1k
views
Which is preferred over differential pairs: trombones or sawtooths?
I have been told that trombones are much better to use than sawtooths, even if sawtooths may be prefered in some certians scenarios.
Here I have added trombones to the differential pairs. If I had ...
- 1,324
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 (...
- 657
1
vote
1
answer
74
views
Confusion About Impedance Matching For Single-Ended and Differential Lines
I understand that for single ended RF signals I must ensure that the characteristic impedance of the transmission line matches the load impedance (say 50 ohm). I am a bit confused for differential RF ...
- 31
1
vote
1
answer
55
views
PCB Newbie Stackup understand questions
I want to design a board with 6 layers up to 1.8mm thickness,120ohm diff and 90ohm diff ,SE 50 ohm
and the manufacturer sent me this stackup:
12 mil for SE-50ohm not too thick?
what is the material ...
- 443
2
votes
0
answers
66
views
HDMI: What is the maximum acceptable differential impedance variation and for which length
Imagine I have a HDMI bus with differential impedance 100 Ohm and length 10cm
Imagine that for a segment of length "L" there is an impedance variation of "DELTA"
Question: in order ...
- 21
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 ...
- 85k
0
votes
3
answers
4k
views
MIPI DSI/differential pair layout guidance
I have a display sample that I'd like to interface with a Linux SBC, the only issue is that the connector is not compatible. To make it possible to interface the two parts I've designed a PCB, trying ...
- 1,315
1
vote
1
answer
3k
views
What value series resistor should I use for USB data lines when two ICs require different impedance values?
I'm using a USB hub (TUSB2036VFR) that communicates with an ATMEGA8U2 and an FTDI chip. The incoming USB signal comes through an isolated USB communications chip ADUM3160BRWZ. The TUSB2036VFR requires ...
- 1,058
0
votes
1
answer
110
views
HDMI green signal not working as intended
I have been working on a host PCB for the Raspberry Pi CM4, and wanted to add some HDMI output. The beauty of the CM4 is that you don't need any further chips, just some current limiting chips on the ...
- 147
12
votes
5
answers
2k
views
Trace impedance ohm meaning
I've been trying to understand the principle of trace impedance (single ended and differential) for a while, read several articles (all the best google has to offer), but I have still some serious ...
- 3,623
2
votes
1
answer
622
views
Differential Pair routing insight for USB 2.0 circuit involving a USB C connector with multiple D_N and D_P pins
I'm bringing USB 2.0 into a PCB design from a USB C receptacle. I've already accounted for the 5.1k resistors needed but I'm stumped on how best to run a differential pair with DP1, DP2, DN1 and DN2 ...
- 23
0
votes
1
answer
150
views
LTC5599: why are these baseband inputs passed through 49.9 ohms and the capacitor + SPI
I'm designing a radar transceiver board using the LTC5599. In the datasheet for the part, there is a schematic that shows the circuit configuration for the evaluation board. Here is an image of the ...
1
vote
1
answer
184
views
RF output matching using baluns: LTC6946
The datasheet that I refer to below can be found here:
https://www.analog.com/media/en/technical-documentation/data-sheets/6946fb.pdf
I have a question about baluns. In the datasheet for LTC6946 ...
0
votes
0
answers
361
views
What is Input Impedance Mismatching of differential Operational Amplifier?
I am new to design differential op-amp.
I am not sure if my circuit will experience input impedance mismatching.
Can anyone explain how input impedance mismatching will happen in differential op-amp? ...
0
votes
1
answer
188
views
Should I cut away the ground pour above a diffpair on the first inner layer, which are Z-matched to the ground layer (L2)?
I'm routing diffpairs on the 1st inner layer of a 4-layer pcb which are Z-matched to the 2nd inner layer which is entirely a ground pour.
The top layer has traces and routing AND also a ground pour ...
- 111