Not to mention that you have to now answer the question when you get an MRI:
"Is there a possibility there are small electronic components embedded in
your body".
Bil
-----Original Message-----
From: si-list-***@freelists.org [mailto:si-list-***@freelists.org] On
Behalf Of Doug Smith
Sent: Wednesday, December 05, 2018 5:34 PM
To: ***@hilton-nickel.net; ***@gmail.com; si-list
Subject: [SI-LIST] Re: 01005 0 ohm resistors in PCIe Gen4 Tx/Rx path
Hi Everyone,
A little off topic but I believe there is a health danger to 01005 resistors
in the lab. It would not be difficult for them to get in your body by
respiration or in the mouth. I think the results would be an early death
years later, especially if inhaled. They should never be out in the open in
dishes/trays where they can spill out.
Just a thought. Would not want anyone to come down with resistosis or
capacitosis (like asbestos) in the coming years.
Doug
On Wed, 5 Dec 2018 14:20:01 -0800 (PST), Alan Hilton-Nickel wrote:
Hey Praveen,
In the range of functional frequenci= es associated with Gen4 speed
(8-24GHz,depending on what you are looking a= t and why), there is nothing
frequency dependent about a standard SMT resis= tor itself. While the any
material has a dielectric constant and loss tange= nt that will result in FD
characteristics, the 01005 (0201) device is elect= rically too small to be a
large impact on insertion loss or reflective loss= .
That said, it will have some parasitics like package inductance and= pad
capacitance.
Also, you are probably aware that "zero ohm= s" does not exist. A zero-ohm
resistor is a manufacturers term for a ve= ry low resistance, typically <1
Ohm. Zero-ohm resistors, by that defini= tion, can be as much as 1 Ohm, or
even slightly more. Against your 85 Ohm e= nvironment, thatis not huge (a
fraction of a dB), but something you can ca= lculate.
More importantly, the problem is going to be with the transi= tions. You are
probably routing on an inner layer (stripline), and transiti= oning to the
surface with a via, and possibly back again with another via. = The via
structure will have losses associated with it, those losses (along = with
theparasitics) can be greater than the impact of the resistor itself.=
If you are using zero-ohm resistors as place-holders for dc-blo= cking
capacitors of the same size, then those structural losses should mini= mized
by your design, characterized by simulation and baked into your loss =
budgetalready. I would avoid putting precautionary zero-ohm resistors into=
your design unless they are absolutely necessary.
If you're = still in doubt, the best way to determine your
frequency-dependent characte= ristics is to measure them.
Alan Hilton-Nickel
On December 5, 2018 at 12:44 PM Praveen Kumar
<***@gmail.com[1]>wrot= e:
Hi experts,
Are there any known issues with using 0 ohm re= sistors in the path of PCIe
Gen4 Tx/Rx signal path.
I couldn̵= 7;t find frequency characteristics of the resistors from
manufacturer da= ta sheet to see if there is significant insertion loss at
8GHz.
T= hanks
Praveen
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