Hi, I've got a 10 MHz distribution amplifier and am considering purchasing a 5 MHz reference. Most (not all) of my equipment accepts a 5 MHz reference, but I'd like to be able to use the existing distribution amplifier I have if possible. Therefore, I'm considering ways I might generate a low-noise 10 MHz signal from the 5 MHz reference.
An obvious way is to use a doubler. However, as I understand it, even an ideal doubler will add 20log(2)=6 dB of phase noise to the 10 MHz signal. It seems like a possibly more expensive, but lower noise way would be to use a PLL with a divider that locks the divided 10 MHz signal to the 5 MHz input. If the time constant of the loop filter is set long enough, does this avoid the phase noise multiplication issue? >From what I've gathered, this is a technique HP used in some of their gear. For example, the 8566 and 8340/1 lock a 100 MHz VCXO to an external reference with a PLL. Any other thoughts on this? Matt _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-le...@lists.febo.com To unsubscribe, go to and follow the instructions there.
