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A Regenerative Frequency Comb

By: Ascarrunz, H.; Walls, F.L.; Howe, D.A.; Nelson, C.; Hati, A.;

2006 / IEEE / 1-4244-0074-0


This item was taken from the IEEE Conference ' A Regenerative Frequency Comb ' We describe a regenerative frequency comb generator (RCG) used to synthesize a signal coherent with the input signal with a fractional multiplication of m/n, where the frequency of n is proportional to 1/¿, where ¿ is the loop delay, and m is a positive integer less than n. We describe the RCG and compare its performance with traditional regenerative dividers, digital dividers and multipliers. Preliminary data for a divide by ten whose residual noise we measured at 100 MHz suggest superior performance to low noise digital dividers, with a SSB noise of ¿145 dBc/Hz at 100 Hz and 1/f characteristic. While we have not attained the broadband performance of the regenerative dividers and conjugate regenerative dividers studied in the past, we have attained ¿162 dBc/Hz at 100 kHz offset and expect to be able to improve the overall noise further by applying techniques investigated in the aforementioned devices.