Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

Can you explain this reflection figure to me?

Status
Not open for further replies.
R

ruwan2

Member level 5
Member level 5
Joined
Nov 29, 2011
Messages
90
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,286
Activity points
2,141
Hi,

I see several on line tutorials on reflection (transmission line), which was originated from Bill Dally 2001. But I cannot find the original paper yet. I still cannot understand the two axis units of the step like curve. Two files used the same figure including S, R curve, see below please.



dally.PNG



One tutorial gave KrS=0.778 which is on this figure, but KrR=0.905, which is beyond this figure range.
Could you explain it to me? Thanks,
 

ruwan2 said:
I still cannot understand the two axis units of the step like curve.
Click to expand...

The plot shows the step response (voltage) at points S and R. Vertical axis is voltage, horizontal is time.
 
  • Like
Reactions: ruwan2

    R

    ruwan2

    Points: 2
    Helpful Answer Positive Rating
maybe helping:
**broken link removed**
 
  • Like
Reactions: ruwan2

    R

    ruwan2

    Points: 2
    Helpful Answer Positive Rating
in the steady state, you just have a voltage divider, so the end voltage is 1V * (1K/(1K + 400))

In the interim, you have a number of voltages bouncing around. Its a 50 ohm transmission like, so there is big reflection at the 1K ternmination, and a smaller reflection for any bounce back at the 400 ohm source. Ignore the red curve, concentrate on the blue curve and it will make more sense. round trip time on the line is 10 nS
 
  • Like
Reactions: ruwan2

    R

    ruwan2

    Points: 2
    Helpful Answer Positive Rating
Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top