本文给出了原子频标中的一种倍频线路。作者设计了相位测量系统和单边带多周期测量系统。用这些系统测定了倍频器的相位漂移和相位噪声。测量表明,温度从30℃升至50℃时,×18倍频器的90MHz输出的相位变化为14°;电源电压从20V升至22V时,相位变化为4.7°;取样时间τ=1s时,倍频器6840MHz输出由相位噪声引起的频率误差σ_τ=1.1×10~(-12),τ=10s时,σ_τ=3.9×10~(-13)。 This article gives a multiplier circuit in atomic frequency standard. The author designed a phase measurement system and single-sideband multi-period measurement system. These systems measure the frequency doubler phase shift and phase noise. The measurement shows that when the temperature rises from 30 ℃ to 50 ℃, the phase change of 90MHz output of × 18 frequency doubler is 14 °. When the power supply voltage rises from 20V to 22V, the phase change is 4.7 °. When sampling time τ = 1s, Frequency multiplier 6840MHz output by the phase noise caused by the frequency error σ_τ = 1.1 × 10 ~ (-12), τ = 10s, σ_τ = 3.9 × 10 ~ (-13).