An effective implementation of high-order bandpass sigma-delta modulators for high speed D/A applications

Author

Leong, Choon Haw ; Roberts, Gordon W.

Author_Institution

Microelectron. & Comput. Syst. Lab., McGill Univ., Montreal, Que., Canada

Volume

1

fYear

1997

fDate

9-12 Jun 1997

Firstpage

49

Abstract

This paper presents a multiplier-free structure for implementing high-order bandpass digital sigma-delta modulators. Near-optimum noise suppression in the passband region of the modulator is achieved by constraining the Noise Transfer Function (NTF) zeros to lie on the unit circle, even after coefficient quantization. High-speed operation is obtained by using a highly modular structure with minimum critical path delays which are independent of the modulator order. Results from various simulations and experimental prototypes are given to illustrate both the stability of the designs and the flexibility of the overall structure

Keywords

BiCMOS integrated circuits; circuit stability; digital-analogue conversion; integrated circuit noise; interference suppression; modulators; sigma-delta modulation; transfer functions; 0.8 micron; high speed DAC applications; high-order bandpass sigma-delta modulators; highly modular structure; multiplier-free structure; near-optimum noise suppression; noise transfer function zeros; stability; CADCAM; Circuits; Computer aided manufacturing; Delay; Delta modulation; Delta-sigma modulation; Digital modulation; Filters; Frequency; Transfer functions;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 1997. ISCAS '97., Proceedings of 1997 IEEE International Symposium on

Print_ISBN

0-7803-3583-X

Type

conf

DOI

10.1109/ISCAS.1997.608519

Filename

608519