[SI-LIST] Re: Whai's the influence of AC couple capacitor
- From: Zaiyi Liao <zaiyi.liao@xxxxxxxxxxxx>
- To: Zhangkun <zhang_kun@xxxxxxxxxx>, "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
- Date: Tue, 3 Nov 2009 14:34:30 +0800
Hello zhangkun:
Thank you for your rapid feedback. I think If it's an ideal capacitor,
100nF is better than 10nF. But self-resonance frequency of a capacitor is
1/sqrt(LC), it's hard to get
A high self-resonance frequency for large capacitor. I find it works well in
some design using 100nF as AC couple capacitor in lower frequency(~100Mhz). So
I'm a little confuse on how
The choose the value. And I'm try to ask supplier to provide S11 and S21
parameter now.
BR//Zaiyi
-----Original Message-----
From: Zhangkun [mailto:zhang_kun@xxxxxxxxxx]
Sent: Tuesday, November 03, 2009 2:07 PM
To: Zaiyi Liao; si-list@xxxxxxxxxxxxx
Subject: 答复: [SI-LIST] Whai's the influence of AC couple capacitor
Hi Liao
In the case of AC coupling, 10nF and 100nF is different. If you want to study
the case, please measure the S21 of 10nF and 100nF. In my view, 100nF is much
better than 10nF, if they are in the same package.
Hope this would be helpful for you.
Best Regards
Zhangkun
2009.11.3
-----邮件原件-----
发件人: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
代表 Zaiyi Liao
发送时间: 2009年11月3日 13:59
收件人: si-list@xxxxxxxxxxxxx
主题: [SI-LIST] Whai's the influence of AC couple capacitor
Hello all:
I'm simulating the XAUI signal at 3.125GHz, I find that the value of
AC couple capacitor influence greatly. After I change the capacitor from 10nF
to 100nF(both capacitor model is ideal), the simulated eyepattern(eye width and
height) improve greatly.
I think 10nF is enough for XAUI signal, and the thru S-parameter is nearly the
same with 10nF and 100nF capacitor. Can anyone explain how the AC capacitor
will influence eyepattern?
In real situation, large value capacitor need lager package which
mean lager parasitic inductance. So what is the guideline to select this Ac
couple capacitor??
Thank you all!
BR//Zaiyi Liao
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