[SI-LIST] Re: Driver slew rates
- From: "Muranyi, Arpad" <Arpad_Muranyi@xxxxxxxxxx>
- To: "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
- Date: Sun, 24 Nov 2013 07:41:56 +0000
Ravi,
Slew rate usually refers to the slope of the voltage (dV/dt) on
the output of a driver. For that reason a receiver doesn't have
slew rate.
Reflections are caused by impedance discontinuities (mismatches)
in the channel. If you have a lot of reflections and not much
loss (damping), you can get a lot of ringing (reflections bouncing
back and forth in the T-line). But ringing can also be caused by
LC effects even if there are no T-lines lines present between the
driver and receiver. Check if your models have lumped RLC package
models.
I hope this helps,
Arpad
====================================================================
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of ravikumar potluri
Sent: Saturday, November 23, 2013 9:49 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Driver slew rates
Hello friends,
If the slew rate of driver is much higher than the slew rate of receiver
does this cause reflections on the transmission line?
I am simulating ADS62P49, 250 MSPS ADC chip (Driver) with Spartan 3A-DSP
(Reciever). I see lot of ringing at the output even when the chips are
connected directly with termination in between and with no transmission
line.
Could someone explain this?
Thanks and Regards,
Ravi
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