| Author |
Message |
doofus32
Joined: 13 Jan 2006
Posts: 23
|
 25 Aug 2006 8:57 Overshoot and Ringing |
|
|
|
|
Today, in high speed IC, the rising time for the output is often shorter than 1 ns.
This cause ringing on the line. This ringing will cause the voltage to go over the voltage that are sendt out. In the teori the double voltage.
Will this double voltage have the possibility to damage the input/output of the IC/Other IC on the board.
|
|
| Back to top |
|
 |
hr_rezaee
Joined: 06 Oct 2004
Posts: 867
Helped: 88
Location: Iran-Mashhad
|
| 25 Aug 2006 18:30 Overshoot and Ringing |
|
|
|
|
hi
I think it can't damage other IC.
but, it can damage information.
regards
|
|
| Back to top |
|
|
cyberblak
Joined: 19 Jul 2005
Posts: 139
Helped: 6
Location: Canada
|
| 27 Aug 2006 5:45 Re: Overshoot and Ringing |
|
|
|
|
Hi,
These disturbances generally aren't destructive. Of course they still should be minimized...
|
|
| Back to top |
|
|
dyfly
Joined: 28 Apr 2005
Posts: 6
|
| 29 Aug 2006 1:31 Re: Overshoot and Ringing |
|
|
|
|
| Now every IC have protection circuit for it's input circuit. so it seems ok. But the data info maybe be destroyed.
|
|
| Back to top |
|
|
we_n_joy
Joined: 27 Oct 2004
Posts: 2
|
| 31 Aug 2006 10:13 Re: Overshoot and Ringing |
|
|
|
|
| The ringing is because of the reflected signal, so its always better to have the proper termination to have the reduce the reflections.
|
|
| Back to top |
|
|
Shohdy
Joined: 19 Jul 2006
Posts: 104
Helped: 5
|
| 31 Aug 2006 12:15 Re: Overshoot and Ringing |
|
|
|
|
Hi,
In a moderate design, the voltage will never go to double the intended voltage.
So there is no damage. Ringing and peeking is usually below 50% of voltage.
Regards,
Shohdy
|
|
| Back to top |
|
|
agump
Joined: 23 Oct 2004
Posts: 53
|
| 01 Sep 2006 4:02 Overshoot and Ringing |
|
|
|
|
| If ringing is too high , it will introduce high crosstalk. So , ringing should be avoided if possible
|
|
| Back to top |
|
|
SFactor
Joined: 07 Oct 2004
Posts: 20
|
| 03 Sep 2006 8:50 Re: Overshoot and Ringing |
|
|
|
|
| the problem of ringinig is due to the mismatch in the signal integrity, try to has some termination resistor to eleimintae them as i think they can damage the data. your data will be corrupted
|
|
| Back to top |
|
|
Nimer
Joined: 26 Apr 2005
Posts: 216
Helped: 25
Location: PALISTINE
|
| 03 Sep 2006 11:12 Re: Overshoot and Ringing |
|
|
|
|
hi
this depends on the duration of ringing pulses ..
regards
|
|
| Back to top |
|
|
kelvinyuan
Joined: 04 Sep 2006
Posts: 1
|
| 04 Sep 2006 8:14 Overshoot and Ringing |
|
|
|
|
Hi,
This causes EMI issue also!
|
|
| Back to top |
|
|
aland
Joined: 09 Sep 2006
Posts: 15
|
| 10 Sep 2006 6:06 Re: Overshoot and Ringing |
|
|
|
|
This idea is used commonly with PCI cards and is known as reflected wave signaling. To get a 3.3V signal a 1.8v signal is sent and a short time later the reflected wave will show up at 3.3 ~ 3.6V, *because the data line is unterminated*.
To avoid ringing use termination resistors, it increases power disipation and signal rise times (dv/dt), but restricts overshoot.
However many IC's (especialy CMOS) have an input protection network of diodes and resistance that protects the input from overvoltage low current spikes. Look at the datasheets for the particular device
|
|
| Back to top |
|
|
