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Pls suggest 5GHz VCO for low jitter

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neoflash

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I am working on a 5GHz 130nm VCO, however, low jitter requirement drive me mad. (<2ps rms).

And I am limited to ring oscillators, any siggestion?
 

haadi20

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Have a look at the following thesis:

http://doc.utwente.nl/fid/2099

It includes a 10 GHz 0.18µm standard CMOS LC VCO with a jitter of 0.22 psec RMS (<2psec)...maybe you can use it as a guideline..

Regards
 

neoflash

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thanks for the input, but I am limited to ring oscillator.
 

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