[SI-LIST] Re: Capacitor S parameter
- From: "Orin Laney" <olaney@xxxxxxxxx>
- To: "'Sukumar'" <sukumarm@xxxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>, <weirsi@xxxxxxxxxx>
- Date: Fri, 10 Jan 2014 10:52:22 -0800
Your customer owes you an explanation. Perhaps the trace lengths and capacitor
placement are intended to resonate or otherwise account for the cap impedance.
Or maybe somebody slipped a decimal point. 159 ohms is simply the datasheet
cap value plugged into Z = 1/sc at 5 GHz.
Orin
From: Sukumar [mailto:sukumarm@xxxxxxxxxxx]
Sent: Friday, January 10, 2014 9:59 AM
To: olaney@xxxxxxxxx; si-list@xxxxxxxxxxxxx; weirsi@xxxxxxxxxx
Subject: Re: [SI-LIST] Re: Capacitor S parameter
Hi Orin and Steve,
Thanks for your response.
My RF signal impedance is 50 ohm. RF signals are routed in the top layer alone.
Signal topology is,
DUT-trace- capacitor-trace-SMA. Capacitor is series connection with trace. And
capacitor value is fixed by my customer. I try to convey my customer.
Could you tell me, how you calculated capacitor impedance through .s2p?
Thanks,
Sukumar
Orin Laney <olaney@xxxxxxxxx> wrote:
That's a 0.2 pF capacitor. Z at 5 GHz is 159 ohms. Perhaps you intended to use
a larger value? Such small caps are more often used for shunt tuning.
Orin
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Sukumar
Sent: Friday, January 10, 2014 12:58 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Capacitor S parameter
Hi Experts,
Currently I'm doing a RF Signal S-parameter simulation.
One series capacitor is connected with RF Signal trace near the DUT side.
RF Signal operating frequency is 5GHz.
I downloaded s parameter(.s2p) model from manufacturer website (
http://psearch.murata.com/capacitor/product/GRM1555C1HR20BA01%23.html
<http://psearch.murata.com/capacitor/product/GRM1555C1HR20BA01%23.html> [1] )
Capacitor part no:GRM1555C1HR20BA01
The insertion loss (S21)is very high up to 10 GHz.
Is this capacitor support 5GHz or
this capacitor allows only above 10GHz Signal?
How can i choose the capacitor which supports 5GHz?
Looking forward for SI Experts answers.
Thanks,
Sukumar
--- Links ---
1 http://psearch.murata.com/capacitor/product/GRM1555C1HR20BA01%23.html
<http://psearch.murata.com/capacitor/product/GRM1555C1HR20BA01%23.html>
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