It it easy to provide various solutions. However he has not said
what he wants to do exactly or why. He just needs a crystal
oscillator or low phase noise source he can control with a voltage.

He might want to lock the crystal to a signal whose frequency
varies for some reason; and the signal he wants to use as a reference
is needs to either some multiple of this reference or that is phase
coherent with this reference signal.

This is a guess as he has not told us why he needs this reference.

Norman


PCS Engineering
Norman Gillaspie
325M Sharon Park Dr. #210
Menlo park, Ca. 94025
Tel 650-854-5263
Fax 650-854-5445
KF6WHG
Email norman@pcseng.com


>