CMOS Analog Integrated Circuits

12.3.3  Vector feedback DEM DAC

FIGURE 12.85Vector feedback ESL.

An alternative element selection approach with the advantage of providing a high-order spectral shaping of the DAC noise can be based on the vector feedback structure [3, 44], which uses a sorting mechanism to determine the DAC unit elements to be selected for each conversion.

The block diagram of a vector feedback ESL is depicted in Figure 12.85.

It consists of a vector quantizer, a min block (or a smallest-element sorter), two adders, and a filter. The vector feedback ESL processes a signal vector, whose length is equal to the number of DAC unit elements, that is, 2^B − 1 for a ...