请教：delta sigma 调制器如何在仿真低频噪声很大时什么原因？

zm19870610 · 发表于 2013-3-26 18:25:41

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输入500HZ信号，1M的采样时钟，频谱中低于500HZ的量很大，谁知道原因？

feynmancgz · 发表于 2013-3-26 19:31:18

回复 1# zm19870610

it is on Matlab level or Circuit level ?
The way you get the PSD plot is correct ?
How many samples ? ...............................
Please give more information, otherwise we cannot reply
At least upload the plot you get

zm19870610 · 发表于 2013-3-26 20:34:05

circuit-level 带宽1K OSR=128 8192个点图在公司的电脑上，没权限考不出来，运放输入噪声e-10 v 级,计算snr用的是何乐年那本书上的代码

feilongf91 · 发表于 2013-3-26 20:45:29

低频闪烁噪声比较严重

feynmancgz · 发表于 2013-3-26 21:41:48

回复 3# zm19870610

according to your information, maybe because of 1/f noise and large offset
Did you use hanning window ?
Maybe you could increase no. of samples to 2^15