Skip to main content

All Questions

4 votes
0 answers
122 views

Can I calculate minimum rise time of a transmission line if I know the length and the loss tangent?

Overview: I am trying to work out if it's possible to transmit my 1.2Gbps MIPI data down a 600mm long flexible PCB strip. Assuming I have the impedance correct, will the signal still be degraded by ...
Rocketmagnet's user avatar
  • 27.5k
1 vote
2 answers
1k views

How does risetime affect transmissionline effects?

How do rise and fall times affect reflection in a transmission line? Reflection will occur with shorter lengths as rise times becomes shorter, does this mean risetime effects the wavelength of a ...
N. Berg's user avatar
  • 159
0 votes
2 answers
486 views

Lossless Transmission Line Length vs Rise Time

I am trying to answer the question - Does a signal's rise time increase with the length of a lossless transmission line? - using LTspice simulation. Some references say that lossless transmission line ...
Vinodh Rakesh's user avatar
0 votes
1 answer
714 views

long stub length rs485

TI recommends their low-data rate transceivers to cope with long stub lengths for RS485 networks -- eg Page 3 of http://www.ti.com/lit/an/slla272c/slla272c.pdf I want to use an isolated interface, so ...
Thor Johnson's user avatar
8 votes
2 answers
5k views

How to determine if a signal path needs to be treated as a transmission line?

I remember reading this somewhere but cannot find the ratio of the rise time vs. the propagation time (i.e. the trace length?) of a signal when transmission line effects come into effect? For example ...
user1406716's user avatar
1 vote
0 answers
196 views

Impedance discontinuity problem at transmission line?

I am confused about how the waveform will be to the left of discontinuity. Please help me understand it better. Here is my understanding: When the unit step hits the inductive discontinuity, at the ...
Ashik Anuvar's user avatar
0 votes
1 answer
420 views

Confusion regarding considering a transmission line as lumped or distributed

I am just elaborating my question. I have came across different formula's to say whether a Transmission line is lumped or distributed. in one of the books i read " Effective length of a electrical ...
user19579's user avatar
  • 1,398
8 votes
1 answer
1k views

Do long transmission lines degrade rise/fall times, and if so, by what mechanism?

I remember someone telling me long ago that if a voltage step is sent down a transmission line, the step will become smeared as it travels down the line, and the rise time will become degraded. I'm ...
Phil Frost's user avatar
  • 57.6k
10 votes
4 answers
9k views

How is rise time related to bandwidth of the signal?

Say, I want to limit the rise time of my digital signal edges to avoid dealing with transmission line effects. How do I determine the maximum frequency of harmonics in my signal knowing that my rise ...
miceuz's user avatar
  • 5,571