[SI-LIST] 答复: clock 2nd harmonic
- From: "Zhenwei Wang (zhenwwan)" <zhenwwan@xxxxxxxxx>
- To: <joel@xxxxxxxxxx>, "SI-List" <si-list@xxxxxxxxxxxxx>
- Date: Fri, 18 May 2012 09:44:37 +0800
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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