A popular scheme for achieving low phase noise across a large range of offset frequencies is to employ an oscillator at an output frequency with low far-from-carrier noise that is phase-locked to a reference that has low close-to-carrier noise. We investigate the effects of vibration on phase locked loop (PLL) when two oscillators with different vibration sensitivity are phase locked. For experimental verification, a 2.5 GHz surface-transverse wave (STW) oscillator integrated with and phase-locked to a reference 10 MHz quartz-crystal oscillator is chosen. The vibration sensitivity of a STW oscillator used for the experiment is slightly lower than the vibration sensitivity of the 10 MHz reference. The PLL is optimized for at-rest operation and then evaluated in the presence of different levels of random vibration.
Proceedings Title: Proc. 2009 PTTI Mtg.
Conference Dates: November 17-19, 2009
Conference Location: Santa Ana Pueblo, NM
Pub Type: Conferences
oscillator, phase-locked loop, phase modulated noise, vibration sensitivity