Frequency stability and phase noise of an improved X-band cryocooled sapphire oscillator

Nitin R. Nand; John G. Hartnett

doi:10.1109/FREQ.2010.5556243

Frequency stability and phase noise of an improved X-band cryocooled sapphire oscillator

Nitin R. Nand, John G. Hartnett

Department of Physics and Astronomy

Research output: Chapter in Book/Report/Conference proceeding › Conference proceeding contribution

1 Citation (Scopus)

Abstract

A previously implemented Cryogenic Sapphire Oscillator (CSO) based on a commercial cryocooler has been modified and its frequency stability and phase noise re-measured against a nominally similar liquid helium cooled CSO in the same laboratory. Assuming both contribute equally, their frequency stability and phase noise have been evaluated. We report for the oscillator a minimum Allan deviation of 3.9 × 10^-16 at 20 s, a long-term frequency drift less than 1 × 10^-14/day, and a measured single sideband phase noise of -97 dBc/Hz at 1 Hz offset from the carrier. The stated performance of the cryocooled CSO is adequate for it to be deployed at a local VLBI site for comparison against the hydrogen maser which is the current reference standard.

Original language	English
Title of host publication	2010 IEEE International Frequency Control Symposium, FCS 2010
Pages	670-673
Number of pages	4
DOIs	https://doi.org/10.1109/FREQ.2010.5556243
Publication status	Published - 2010
Event	2010 IEEE International Frequency Control Symposium, FCS 2010 - Newport Beach, CA, United States Duration: 1 Jun 2010 → 4 Jun 2010

Other

Other	2010 IEEE International Frequency Control Symposium, FCS 2010
Country	United States
City	Newport Beach, CA
Period	1/06/10 → 4/06/10

Access to Document

10.1109/FREQ.2010.5556243

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title = "Frequency stability and phase noise of an improved X-band cryocooled sapphire oscillator",

abstract = "A previously implemented Cryogenic Sapphire Oscillator (CSO) based on a commercial cryocooler has been modified and its frequency stability and phase noise re-measured against a nominally similar liquid helium cooled CSO in the same laboratory. Assuming both contribute equally, their frequency stability and phase noise have been evaluated. We report for the oscillator a minimum Allan deviation of 3.9 × 10-16 at 20 s, a long-term frequency drift less than 1 × 10-14/day, and a measured single sideband phase noise of -97 dBc/Hz at 1 Hz offset from the carrier. The stated performance of the cryocooled CSO is adequate for it to be deployed at a local VLBI site for comparison against the hydrogen maser which is the current reference standard.",

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AB - A previously implemented Cryogenic Sapphire Oscillator (CSO) based on a commercial cryocooler has been modified and its frequency stability and phase noise re-measured against a nominally similar liquid helium cooled CSO in the same laboratory. Assuming both contribute equally, their frequency stability and phase noise have been evaluated. We report for the oscillator a minimum Allan deviation of 3.9 × 10-16 at 20 s, a long-term frequency drift less than 1 × 10-14/day, and a measured single sideband phase noise of -97 dBc/Hz at 1 Hz offset from the carrier. The stated performance of the cryocooled CSO is adequate for it to be deployed at a local VLBI site for comparison against the hydrogen maser which is the current reference standard.

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