[SI-LIST] 答复: Whai's the influence of AC couple capacitor
- From: Zhangkun <zhang_kun@xxxxxxxxxx>
- To: 'Zaiyi Liao' <zaiyi.liao@xxxxxxxxxxxx>, si-list@xxxxxxxxxxxxx
- Date: Tue, 03 Nov 2009 14:43:58 +0800
是在中国工作吗？
我直接用中文吧，更好表达一些。
我觉得你在这里犯了一个错误。在AC耦合中，整个电容是串在50欧姆传输线中的。当电
容在谐振时，对50欧姆传输线的传输特性根本没有影响。
建议你在ADS中模拟仿真。把一个ESL－ESR－C的模型串联在两根50欧姆传输线之间，然
后调节电容的各个参数，看看整个系统的传输特性（S21）的变化。
你做SI几年了？
祝工作顺利！
张坤
华为技术有限公司 huawei_logo
地址：深圳市龙岗区坂田华为基地 邮编：518129
http://www.huawei.com
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-----邮件原件-----
发件人: Zaiyi Liao [mailto:zaiyi.liao@xxxxxxxxxxxx]
发送时间: 2009年11月3日 14:35
收件人: Zhangkun; si-list@xxxxxxxxxxxxx
主题: RE: [SI-LIST] Whai's the influence of AC couple capacitor
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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