[SI-LIST] Re: The output impedance of tranceiver
- From: Todd Westerhoff <twesterh@xxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Thu, 8 Jan 2015 23:40:32 -0500 (EST)
Tesla,
The impulse response for the analog channel computed during IBIS-AMI simulation
includes the effects of both the TX analog output (which includes output
impedance and voltage characteristics) and the RX analog termination network.
So - yes, the I-V curve determines the TX output impedance, but the details of
exactly how the I-V curves get used are (somewhat) tool-dependent.
FWIW, we're presenting a paper at DesignCon titled "Understanding IBIS-AMI
Simulations", session 6-TH4 on Thursday morning. The paper includes a
discussion of how analog channel impulse responses and algorithmic models are
processed to produce simulation results.
Todd.
Todd Westerhoff
VP, Semiconductor Relations
Signal Integrity Software Inc. • www.sisoft.com
6 Clock Tower Place • Suite 250 • Maynard, MA 01754
(978) 461-0449 x24 • twesterh@xxxxxxxxxx
“ I want to live like that”
-Sidewalk Prophets
----- Original Message -----
From: "Tesla" <emcesd@xxxxxxx>
To: twesterh@xxxxxxxxxx
Cc: si-list@xxxxxxxxxxxxx
Sent: Thursday, January 8, 2015 8:19:08 PM
Subject: Re:[SI-LIST] Re: The output impedance of tranceiver
Hi Todd
Thanks for the hint~
i think i am wrong in my previous standard. The IBIS file do not say the output
impedance is 50ohm. The output impedance is determined by the I-V curve
specified in IBIS file?
Best Regards.
Tesla
At 2015-01-08 19:46:16, "Todd Westerhoff" <twesterh@xxxxxxxxxx> wrote:
>Tesla,
>Are you saying that the Tx output is modeled as an ideal 50 ohm source? If so,
>why do you think that?
>
>Todd.
>
>
>--
>
>Todd Westerhoff
>VP, Semiconductor Relations
>SiSoft
>6 Clock Tower Place, Suite 250
>Maynard, MA 01754
>(978) 461-0449 x24
>twesterh@xxxxxxxxxx
>www.sisoft.com
>
>
>“I want to live like that"
> -Sidewalk Prophets
>
>
>> On Jan 8, 2015, at 3:47 AM, Tesla <emcesd@xxxxxxx> wrote:
>>
>> Hello Expert
>> In the AMI simulation, the impedance of tranceiver is modeled as a ideal 50
>> ohm resistor(pair) and package model. i am thinking that the assumed ideal
>> 50ohm is valid for the frequency of interest? Also there will be impedance
>> imbalance between P and N pin.
>>
>> is possible to measure the output impedance using VNA? Can someone give some
>> link on output impedance of a tranceiver?
>>
>> Best Regards.
>>
>> Tesla------------------------------------------------------------------
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