Suppression of Vibration-Induced Sidebands

Study and define the feasibility and the possible improvements from the suppression of vibration-induced sidebands in crystal oscillators. Task A: Study and define and optimal design design for obtaining the sum and difference frequencies from two nominally identifical SC-cut crystal oscillators appropriately arranged with respect to each other so as to obtain maximum cancellation of steady-state acceleration sensitivities. Task B: Study and design an analog circuit to use the information in the difference frequency to obtain optimal correction of the sum frequency. Task C: Study and define A/D and D/A converters to support digital compensation. Study the impact of clock instability on conversion accuracy. Task D: Study and define digital compensation schemes. In particular study the adequacy of using the crystal oscillator to be compensated for the clock for the digital processing.