CAJ | 학술논문

根据被动型相干布居囚禁原子钟对微波信号的要求,利用小数分频锁相环技术实现了微波频率综合,并通过优化环路带宽得到最佳的输出相噪.测试结果表明:3 417 MHz微波输出在100 Hz处的相位噪声达到-80 dBc;中心频率±50 kHz范围内的杂散抑制达到54 dB,都接近于理论值.将产生的微波用于所研制的CPT原子钟,获得频率稳定度达到1 000 s内6×10~(-11) τ~(-1/2),为目前国外商品钟水平.
근거피동형상간포거수금원자종대미파신호적요구,이용소수분빈쇄상배기술실현료미파빈솔종합,병통과우화배로대관득도최가적수출상조.측시결과표명:3 417 MHz미파수출재100 Hz처적상위조성체도-80 dBc;중심빈솔±50 kHz범위내적잡산억제체도54 dB,도접근우이론치.장산생적미파용우소연제적CPT원자종,획득빈솔은정도체도1 000 s내6×10~(-11) τ~(-1/2),위목전국외상품종수평.
In accordance with the requirement to microwave signal by the passive Coherent Population Trapping (CPT) atomic clock, microwave frequency synthesis is realized through fractional-N PLL technology, and best phase noise of the microwave is obtained by optimizing the loop width. Measurement results show that the achieved phase noise of the 3 417 MHz microwave is -80 dBc at 100 Hz and the spur suppression is 54 dB in±50 kHz scope, both are close to the theoretical values. The realized microwave is applied to our developed CPT atomic clock, and the short term frequency stability 6×10~(-11)τ~(-1/2)(1 s～1 000 s), which is the best frequency stability of present commercial CPT atomic clock，is obtained.