A method, based on asynchronous spectral averaging, to measure the standard deviation of a clock/aperture jitter of an A/D (analog-to-digital) system is proposed. A sine wave with frequency f/sub 0/ is used as an input test signal to a B-bit A/D system. Spectral averaging is then performed on many asynchronously acquired data records with length N. The jitter standard deviation can then be calculated from the measured signal-to-noise floor ratio. An expression which relates the signal-to-noise floor ratio to the standard deviation of the jitter is derived in a closed form. Simulation results are also presented and are shown to be in very good agreement with the theoretical results.
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机译:提出了一种基于异步频谱平均的方法来测量A / D(模数)系统的时钟/孔径抖动的标准偏差。频率为f / sub 0 /的正弦波用作B位A / D系统的输入测试信号。然后,对许多长度为N的异步采集的数据记录执行频谱平均。然后,可以从测得的信噪本底比计算出抖动标准偏差。以封闭的形式得出将信噪底比与抖动的标准偏差相关联的表达式。仿真结果也被提出,并且被证明与理论结果非常吻合。
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