250MHz 10bit ADC进展与求助

prof3

原帖由 xjjx2005 于 2009-3-28 19:51 发表

                               
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To prof3:

You said: Basically Matlab will convert 010011... into an ideal decimal value and FFT, this is no any quantization error. If you did like this, RAW data processing also looks ok.
没有明 ...

Yes.

vdslafe

原帖由 prof3 于 2009-3-29 07:05 发表

                               
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You don't understand my point. Here is a simple question, let say you have an ideal 4-bit ADC, your input signal is ideal, please plot FFT of ADC output. And tell me what is SNR and SNDR. Then y ...

其实你就是想说sigma-delta ADC quantization 可以不 limit SNDR？
ideal ADC, SNDR 就是SNR, 但是harmonic distortion 并不是无限小。

prof3

原帖由 vdslafe 于 2009-3-29 07:50 发表

                               
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其实你就是想说sigma-delta ADC quantization 可以不 limit SNDR？
ideal ADC, SNDR 就是SNR, 但是harmonic distortion 并不是无限小。

Many cases if your sigma-delta ADC design target at median resolution, and median level distortion, you can treat quantization noise signal independent which does not create issue when you talking about SNDR. For high resolution and target for very low distortion, that is not.

Ideal ADC has SNR limited by number of bit, but it can have very low THD.

kivvzhou

楼主做的东西这么快呀，用在什么地方要这么高的采样速度？

abonic

回复 1# fuyibin

深夜学习楼主此贴，如久旱甘霖，意犹未尽，一点睡意全无。
做Pipelined 也有一段时间了，Tapeout也有几个了，摸索着前进，try & err, 总觉得自己在电路的理解上还远未入流，
若逢高手指点一二，当感激涕零。
yibin & prof3，此二君，可谓吾师。

huasheng2008

回复 1# fuyibin
把SHA 删除。

FlyingPig2

谢谢分享，都是大佬

rfic168

真是不錯