some questions sigma-delta DAC

[lcking]

sigma delta dac dem

Where can I download some paper about the theory of DEM techniques for Sigma-delata DAC?
and, who can explain the encode rule of the signed thermometer code?

 

[svicent]

You can get information:

1 Elektroda forum. Search sigma delta

2 XILINX application note XAPP154.PDF "Virtex ynthesizable Delta-Sigma DAC"

3 Circuit Cellar #140 March 2002, pag 52..59 "Balancing D/A Conversion on One Pin

 

[nk_me]

DEM is relatively easy to understand.
Many papers are available.
it is difficult to determine the structure of the system,
especially the structure of the modulator.