基于平均功率谱的高精度A/D转换器动态参数测试

Measurement of Dynamic Parameters of High-Resolution A/D Converters Based on Power-Spectral Averaging

讨论了窗函数处理在基于FFT变换的高精度A/D转换器动态参数测试中的不足,提出了基于平均功率谱的高精度A/D转换器动态参数测试方法,并从理论上证明了该方法可以有效降低FFT变换测试方法中由于采用窗函数处理引入的噪声误差。最后,以ADI公司的16位A/D转换器AD9260为例,对其信噪比和总谐波失真等动态参数进行了测试实验验证。

Measurement 05 dynamic parameters 05 the high-resolution A/D converter is studied using power-spectral averaging technique. It is theoretically demonstrated that the noise 51oor introduced 5rom the window 5unction processing in FFT computation could be greatly reduced by using this technique. Test perSorrned on a 16-bit A/D converter shows that experimental results are in good agreement with theoretical computation.