[SI-LIST] Re: clock 2nd harmonic
- From: "Rose, Michael" <mrose@xxxxxxxxxxxxxxxxx>
- To: "vinu@xxxxxxxxx" <vinu@xxxxxxxxx>, "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
- Date: Thu, 17 May 2012 19:50:07 +0000
I usually suspect duty cycle. A quick test is to run from a lab source where
you can vary DC. Also, you may want to characterize DCD jitter. Another thing
you could look for is excessive mounting inductance to Vcc AND return. And if
the clock source has local LC filter you could try temporarily shorting around
the inductor in case you're seeing some resonance in the filter.
cheer, mike
________________________________________
From: si-list-bounce@xxxxxxxxxxxxx [si-list-bounce@xxxxxxxxxxxxx] on behalf of
Vinu Arumugham [vinu@xxxxxxxxx]
Sent: Thursday, May 17, 2012 3:01 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: clock 2nd harmonic
Can't it be duty cycle distortion or for a differential clock, skew
between true and complement?
Thanks,
Vinu
On 05/17/2012 11:53 AM, Kevin Rhoads wrote:
> On 5/17/2012 2:43 PM, Joel Brown wrote:
>> I am having an EMI problem with the second harmonic of a 65 MHz clock.
>> There is a strong emission at 130 MHz.
> You do not get any harmonics without non-linearity. Where is there
> something that is non-linear that the clock touches?
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