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How to Remove Clock Spikes?

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keithma

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The input clock frequency is among 5M~15M. At first , the clock spikes should be removed. I want to cope with it with a ordinary low pass filter, whose pass-band cut-off frequency is 15.5M. But the simulation result imply that the clock will also be distorted, especially when the frequency close to 15M. Can anybody help me to remove the spikes without worsing the clock? Thanks.
 

Thanks a lot.
Any other simpler ones?
 

you can use a low pass filter following a schmitt trigger buffer.

the low pass filter can has higher cutoff frequency.

perhaps this method will work.


best regsrds




keithma said:
The input clock frequency is among 5M~15M. At first , the clock spikes should be removed. I want to cope with it with a ordinary low pass filter, whose pass-band cut-off frequency is 15.5M. But the simulation result imply that the clock will also be distorted, especially when the frequency close to 10M. Can anybody help me to remove the spikes without worsing the clock? Thanks.
Click to expand...
 

If your clock spike is not large and locate on high or low voltage level (not on edge), schmitt triger inverter is a good choice.
 

Thank you very much for all of your replies. Your suggestions are very good. But I also have another question.
The clock spikes may be as follow:
[/img]
So first of all I should remove the spikes with a low pass filter whose pass-band cut-off frequency may be not too high above 15M, as some spikes frequency is close to it. And then recover the clock from the filtered signal with a schmitter trigger, as your suggestion. The problem is that the filtered signal with frequency among the transition band of the low pass filter will be recovered , too.
 

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