English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Phase noise of the frequency synthesizer is one of the main limitations tothe short-term stability of microwave atomic clocks. In this work, wedemonstrated a low-noise, simple-architecture microwave frequency synthesizerfor a coherent population trapping (CPT) clock. The synthesizer is mainlycomposed of a 100 MHz oven controlled crystal oscillator (OCXO), a microwavecomb generator and a direct digital synthesizer (DDS). The absolute phasenoises of 3.417 GHz signal are measured to be -55 dBc/Hz, -81 dBc/Hz, -111dBc/Hz and -134 dBc/Hz, respectively, for 1 Hz, 10 Hz, 100 Hz and 1 kHz offsetfrequencies, which shows only 1 dB deterioration at the second harmonic of themodulation frequency of the atomic clock. The estimated frequency stability ofintermodulation effect is 4.7*10^{-14} at 1s averaging time, which is abouthalf order of magnitude lower than that of the state-of-the-art CPT Rb clock.Our work offers an alternative microwave synthesizer for high-performance CPTRb atomic clock.

A low phase noise microwave source for high performance CPT Rb atomic clock