应用于氢原子频率标准的相位锁定环路

Phase-locked Loops Used with Atomic Hydrogen Frequency Standard

主动型原子频率标准如氢脉泽具有目前最优秀的频率稳定度 ,然而氢脉泽源产生的信号不能直接应用 .

Active atomic frequency standards, such as hydrogen maser, are characterized by a very good frequency stability. However, they deliver a signal at a power level and at a frequency that are not practical to the users. This paper descries the techniques used to phase lock to the hydrogen maser a standard crystal oscillator at a cardinal frequency.