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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Reducing local oscillator phase noise limitations on the frequencystability of passive frequency standards: tests of a new concept
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Reducing local oscillator phase noise limitations on the frequencystability of passive frequency standards: tests of a new concept

机译：降低本地振荡器相位噪声对无源频率标准的频率稳定性的限制：新概念的测试

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摘要

We report on the experimental test of a new concept for reducingnthe limitation on short-term frequency stability of passive frequencynstandards due to local oscillator phase noise. This concept is generalnand can be applied to many passive frequency standards. Systems that usensinewave modulation to interrogate a stable resonance are limited innshort-term frequency stability by phase noise at the second harmonic ofnthe modulation, fm. This effect limits the fractionalnfrequency stability to approximately Σv(Τ7)=0.9(fnm/Ν0)n(SΦ(2fm))1/2Τ-1/2,nwhere Ν0 is the carrier frequency and SΦ(2fnm) is the phase noise at twice the modulation frequency.n(Contributions from higher even harmonics of the modulation generallyncan be neglected). This new concept uses notch filters atn±2fm from the carrier to reduce this effect. Tests onna modified passive rubidium standard demonstrate an improvement ofnapproximately 18 in Σy(Τ). The dual notch filtersnproved to be feasible and were obtained commercially. Measurementsnsuggest that ultimate performances of less thann2×10-14Τ-1/2 are possible if the atomicnresonance has sufficient quality
机译：我们报告了一种新概念的实验测试，该新概念用于减少由于本地振荡器相位噪声而引起的对无源频率标准的短期频率稳定性的限制。该概念是普遍的，并且可以应用于许多无源频率标准。使用正弦波调制来询问稳定谐振的系统在短期频率稳定性方面受到调制fm的二次谐波处的相位噪声的限制。这种影响将分数n频率稳定性限制为大约Σv（t7）= 0.9（fnm /Ν0）n（SΦ（2fm））1 /2Τ-1/ 2，其中Ν0是载波频率，SΦ（2fnm）是相位噪声两倍的调制频率.n（通常可以忽略调制的较高偶次谐波的贡献）。这个新概念使用了距离载波为n±2fm的陷波滤波器来减小这种影响。在改良的被动passive标准上进行的测试表明，Σy（Τ）大约提高了18。经证实，双陷波滤波器是可行的，并已在商业上获得。测量表明如果原子共振具有足够的质量，则最终性能可能小于n2×10-14Τ-1/ 2

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