基于Blackman-Harris窗三谱线插值测试ADC信噪比的方法 |
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引用本文: | 虞致国,孙益洲,黄朴,何芹,顾晓峰.基于Blackman-Harris窗三谱线插值测试ADC信噪比的方法[J].测试科学与仪器,2017(4):321-327. |
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作者姓名: | 虞致国 孙益洲 黄朴 何芹 顾晓峰 |
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作者单位: | 物联网技术应用教育部工程研究中心,江苏 无锡 214122;江南大学 电子工程系,江苏 无锡 214122 |
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基金项目: | Summit of the Six Top Talents Program of Jiangsu Province,Fundamental Research Funds for the Central Universities,Graduate Student Innovation Program for Universities of Jiangsu Province |
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摘 要: | 利用快速傅里叶变换(FFT)测试模数转换器(ADC)的信噪比(SNR)必然存在非相干采样,导致测量结果会受频谱泄漏的影响.针对此问题,提出了一种利用Blackman-Harris窗三谱线插值测试高速ADC SNR的方法.基于MATLAB构建了验证平台,采用美国模拟器件公司(ADI)的AD9627等高速ADC产品的行为级动态模型进行了仿真验证.结果表明,在非相干程度最大的情况下,基于Blackman-Harris窗三谱线插值测试得到的SNR误差低于0.23 dB,达到了ADI公司提供的测试标准,证明该法能很好地抑制频谱泄漏的影响,提高SNR测试精度.
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关 键 词: | Blackman-Harris窗 信噪比 加窗插值 频谱泄漏 非相干采样 |
A Blackman-Harris windowed triple-spectrum-line interpolation method for measuring SNR of ADCs |
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Abstract: | In the practical measurement of signal to noise ratio (SNR)of analog-to-digital converters (ADCs)by using fast Fou-rier transformation (FFT)method,the non-coherent sampling is inevitable,leading to spectral leakage which in turn affects the calculation accuracy and final measurement results.In this paper,a new method based on the Blackman-Harris windowed tri-ple-spectrum-line interpolation is presented for the measurement of ADC's SNR by FFT.The simulation platform is built based on MATLAB and the behavioral dynamic models of the high-speed ADC products of Analog Devices Inc.(ADI)are simulated. The simulation results show that,even in the case of the maximum non-coherent degree,the SNR error is less than 0.23 dB and reaches the testing standards provided by ADI,confirming that the proposed method is effective for suppressing the spec-tral leakage effects and improving the SNR test accuracy. |
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Keywords: | Blackman-Harris windowed signal to noise ratio (SNR) triple-spectrum-line interpolation spectral leakage non-coherent sampling |
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