Dynamic Element Matching and Noise Shaping

[mike_bihan]

dynamic element matching dac

There are quite a few papers stated that they could shape the mismatch noise in DAC, by using special scrambling techniques.

However, I very much doubt it, since the error of DAC will not be sensed by circuit, it is impossible to shape it as sigma-delta modulator do. The best way of noise reduction is to randomly select elements and make the mismatch looks as white noise, and was pushed to high frequency range.

 

[steer]

dynamic element matching

Believe it or not, there are much better ways to do dynamic matching. Some of them are described in papers. Another part - in patents.

 

[mike_bihan]

noise shaping dynamic element matching

Is there any way to briefly explain it?

I've read a few papers, they don't make sense to me though.

 

[renwl]

randomly select elements is one method of DEM.
it's the noise shaping indeed.

 

[naalald]

Hi,
In This paper a new method is introduced instead of using DEM.

 

[mike_bihan]

The attachment is gone. Can you give the full name of this paper?

 

[mitrobge]

in the data converter book, chapter 7 you can find a description of several techniques for dem.

 

[naalald]

Hi mike_bihan,
The paper is :
"A Low-Power Multi-Bit delta sigma Modulator in 90-nm Digital CMOS Without DEM"
Jiang Yu and Franco Maloberti, Journal of Solid State Circuits, 2005.