[SI-LIST] 答复: 答复: clock 2nd harmonic
- From: "Zhenwei Wang (zhenwwan)" <zhenwwan@xxxxxxxxx>
- To: "Antonis Orphanou" <orphanou@xxxxxxxxxxxx>, <joel@xxxxxxxxxx>, "SI-List" <si-list@xxxxxxxxxxxxx>
- Date: Mon, 21 May 2012 09:38:55 +0800
Hi Antonis,
Yes. Your presention showed the one thing in two side. If Tr!=Tf, then
high-width does not equal low-width.
BR
Zhenwei(Jason) Wang
Tel：86-21-33953982 Mob:13671886168
Fax：86-21-33956564
Cisco Systems (Shanghai) Video Technology Co., Ltd.
4F of Building 6, 1528 Gu Mei Rd. Caohejing Hi-tech Park, Shanghai 200233
-----邮件原件-----
发件人: Antonis Orphanou [mailto:orphanou@xxxxxxxxxxxx]
发送时间: 2012年5月19日 3:02
收件人: Zhenwei Wang (zhenwwan); joel@xxxxxxxxxx; SI-List
主题: RE: [SI-LIST] 答复: clock 2nd harmonic
FYI.....both the rise/fall differences and duty cycle can help manifest the
second harmonic.
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Zhenwei Wang (zhenwwan)
Sent: Thursday, May 17, 2012 6:45 PM
To: joel@xxxxxxxxxx; SI-List
Subject: [SI-LIST] 答复: clock 2nd harmonic
Hi Joel,
It seems like the clock duty issue. Base Fourier technique, if the duty
is not ideally 50%, the even harmonic will present in spectrum.
BR
Zhenwei(Jason) Wang
Cisco Systems (Shanghai) Video Technology Co., Ltd.
-----邮件原件-----
发件人: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] 代表 Joel
Brown
发送时间: 2012年5月18日 2:43
收件人: SI-List
主题: [SI-LIST] clock 2nd harmonic
I am having an EMI problem with the second harmonic of a 65 MHz clock.
There is a strong emission at 130 MHz.
What is most likely causing the second harmonic and how can I reduce it?
The clock waveform does not look seriously distorted.
Thanks
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