[time-nuts] Low noise frequency multiplication

John Miles jmiles at pop.net
Wed Feb 28 18:37:15 EST 2007

As always, "without degrading the phase noise" is only half of the spec.
The other half is "at offsets of X Hz and beyond."  What is X?  It can make
all the difference.

I'd look at using a PLL to lock a 100 MHz VCXO to your 10 MHz source.  If
you are willing to lock one crystal oscillator to another, the loop
bandwidth can be made very low, ruling out any noise degradation at the
offsets you're most likely to be interested in.

State-of-the-art in low-noise harmonic multiplication seems to be the
nonlinear transmission-line multipliers sold by Picosecond Pulse Labs, but
they are targeted at GHz-and-up applications.  Perhaps there are ways to
realize similar structures with varicaps and lumped inductors in the
HF-to-lower-VHF region...?

-- john, KE5FX

> Hi all,
> How difficult is it to multiply a frequency standard from 10MHz
> to 100MHz?

More information about the time-nuts mailing list