| Autor: |
Hati, A., Nelson, C. W., Barnes, C., Lirette, D., DeSalvo, J. A., Fortier, T., Quinlan, F., Ludlow, A., Rosenband, T., Diddams, S. A., Howe, D. A. |
| Zdroj: |
2012 IEEE International Frequency Control Symposium Proceedings; 1/ 1/2012, p1-4, 4p |
| Abstrakt: |
We implement an ultra-low-noise frequency divider chain from 8 GHz to 5 MHz that utilizes custom-built regenerative frequency divide-by-2 circuits. The single-sideband (SSB) residual phase-noise of this regenerative divider at 5 MHz output is −163 dBc/Hz at 10 Hz offset frequency. This level is achieved with custom-built mixers that use 2N2222A bipolar junction transistors in a conventional double-balanced diode ring. We report absolute phase-noise of radio-frequency (RF) signals at 10 MHz and 5 MHz obtained by dividing an 8 GHz signal generated from ultra-stable optical comb-based frequency division. The absolute SSB phase-noise for a 10 MHz and 5 MHz signal at 1 Hz offset is −143 dBc/Hz and −150 dBc/Hz, and at 100 kHz offset is −174 dBc/Hz and −177 dBc/Hz, respectively. [ABSTRACT FROM PUBLISHER] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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