A novel structure of delta-sigma modulator (DSM) is proposed where a two-stage second-order loop is modified to a third-order loop by using one differentiator. The structure is simple and is shown to achieve 16-bit performance for Hi-Fi audio-band applications when the sampling rate is 3 MHz. For the applications in A/D, the sampling rate for this structure is two times of that for the double-loop DSM. For the application in D/A, the 17-bit resolution is obtained by sending the output of the differentiator back to the first stage comparator. The circuit implementation of the structure and its nonideal effect have been verified by computer simulation.
|Number of pages||4|
|Journal||Proceedings - IEEE International Symposium on Circuits and Systems|
|State||Published - 1 Dec 1991|
|Event||1991 IEEE International Symposium on Circuits and Systems Part 4 (of 5) - Singapore, Singapore|
Duration: 11 Jun 1991 → 14 Jun 1991