Title :
Design considerations in high-order multi-bit sigma-delta modulators
Author :
Ju, Peicheng ; Suyama, Ken
Author_Institution :
Lucent Technols., Bell Labs., Murray Hill, NJ, USA
Abstract :
A study of dynamics of high-order single-loop multi-bit sigma-delta modulation is presented. The improved stability characteristics of multi-bit modulation result in a wider stable input range than that of one-bit modulation. A quasi-linear relationship is shown to exist between the stable input ranges of two modulators with a difference only in the number of quantization levels. A trade-off between the stable input range and baseband quantization noise suppression in an N-bit modulator allows it to achieve more than 6N dB in signal-to-noise ratio as well as further suppression of discrete tones associated with the limit-cycle effect
Keywords :
circuit noise; circuit stability; limit cycles; modulators; sigma-delta modulation; SNR; baseband quantization noise suppression; dynamics; high-order sigma-delta modulators; limit-cycle effect; multi-bit sigma-delta modulators; quantization levels; quasi-linear relationship; signal-to-noise ratio; single-loop type; stability characteristics; stable input range; Baseband; Chirp modulation; Delta-sigma modulation; Frequency; Limit-cycles; Noise reduction; Noise shaping; Quantization; Signal to noise ratio; Stability;
Conference_Titel :
Circuits and Systems, 1997. ISCAS '97., Proceedings of 1997 IEEE International Symposium on
Print_ISBN :
0-7803-3583-X
DOI :
10.1109/ISCAS.1997.608749
