BRIEF DESCRIPTION OF THE DRAWINGS
The features and nature of the present invention will become more apparent from the detailed description set forth below when taken in conjunction with the drawings in which like reference characters identify correspondingly throughout.
FIG. 1 shows an oversampling DAC implementing ΣΔ modulation with offset.
FIG. 2 shows another oversampling DAC implementing ΣΔ modulation with offset.
FIG. 3 shows a block diagram of a second-order 4-bit ΣΔ modulator.
FIGS. 4A and 4B show quantization noise without and with offset.
FIG. 5 shows a block diagram of a DAC and a lowpass filter.
FIG. 6 shows the operation of a DEM unit.
FIG. 7 shows a process for performing oversampling and noise shaping.