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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Santiago, D.G. Dick, G.J. |
| Copyright Year | 1993 |
| Description | Author affiliation: Jet Propulsion Lab., California Inst. of Technol., Pasadena, CA, USA (Santiago, D.G.; Dick, G.J.) |
| Abstract | A cryogenic sapphire phase stabilizer (SPS) has been developed to meet microwave oscillator phase noise requirements. The SPS uses a high-Q, X-band sapphire dielectric whispering-gallery mode resonator as a discriminator to stabilize a quartz crystal oscillator. At an untuned frequency of 7.9449 GHz with a loaded Q of 6 million, an "open loop" discriminator noise floor (referred to 100 MHz) of approximately S/sub phi/(f) = -110 dB/f/sup 3/(/Hz) was previously reported for offset frequencies from 1 Hz to 1 kHz. Precise tuning of the sapphire resonant frequency now allows implementation of simplified control loops together with suppressed-carrier phase sensing circuitry. These improvements make possible an ultralow-noise demonstration of closed-loop SPS performance. From 1 Hz to 1 kHz a comparison of the SPS with a quartz crystal reference oscillator of the highest quality showed only the noise of the reference oscillator. These results appear to represent the lowest phase noise in a closed-loop or active sapphire oscillator to date at temperatures achievable with liquid nitrogen (77 K or higher).< |
| Starting Page | 774 |
| Ending Page | 778 |
| File Size | 386134 |
| Page Count | 5 |
| File Format | |
| ISBN | 0780309057 |
| DOI | 10.1109/FREQ.1993.367476 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 1993-06-02 |
| Publisher Place | USA |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Testing NASA Microwave oscillators Phase noise Cryogenics Dielectrics Whispering gallery modes Circuit optimization Resonant frequency RLC circuits |
| Content Type | Text |
| Resource Type | Article |
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