mixer output phase noise and jitter

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liusupeng

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assume that the two input to the mixer are of same frequency and same phase noise, the output frequency will double. what is the relationship between output frequency jitter and input jitter?
are they the same?
 

If the frequency is multiplied by 2, PN will be worse by 6 dB..
 

The jitter will double....IF the two frequencies are correlated.

If they are uncorrelated (i.e. two separate oscillators) the phase noise only goes up 3 dB, and jitter only goes up by √2.
 
biff44 said:
The jitter will double....IF the two frequencies are correlated.

If they are uncorrelated (i.e. two separate oscillators) the phase noise only goes up 3 dB, and jitter only goes up by √2.
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Hi biff44,
thanks for your reply!
i agree that phase noise goes up by 3 dB. But when we convert from phase noise to jitter, we have to divide phase noise by 2*pi*fc. So phase noise goes up by 3dB, but center frequency also go up 2 times.
 

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