关于sigma delta modulator 的噪声搬移作用

rainheart

哪位大虾可以解释一下sigma delta modulator 在PLL中的噪声搬移作用，谢谢（看过几本教材，大多语焉不详，偶又不太懂SDM，所以一直没搞明白这一原理）

prof3

Basically, SDM has a high pass noise shaping in many case of the FNPLL design. You can design a SDM with effective bandwidth lower than the PLL loop bandwidth so that the SDM noise will be removed by the PLL loop.
In the case of PLL loop is fixed or can not change, you have to modify the order, quantizer level of SDM itself.

Here attached a simple paper from perrot[isscc97] perrott_isscc97.pdf (1021.49 KB , 下载次数: 176 )

2009-3-7 09:48 上传

点击文件名下载附件

Hopefully it helps.

darius

l also have  interest on it

darius

l also have interest on it

[ 本帖最后由 darius 于 2009-3-7 22:05 编辑 ]

intercon

SDM 之所以具有噪声整形作用在于其构成的反馈环路及环路中积分器所具有的低通特性，具体描述可见JOHN ROGERS的著作

yangliang1110

好东西，谢谢分享！

yangliang1110

下了，谢谢！

knightliu

看看。。。。顶。。。。。

telenet123

Thanks!!

heweyou

bu ming bai