Title :
SNR performance of an adaptive sigma delta modulator
Author :
Aldajani, M.A. ; Sayed, A.H.
Author_Institution :
Dept. of Electr. Eng., California Univ., Los Angeles, CA, USA
Abstract :
In a previous study, we proposed an adaptive sigma delta modulator with an improved dynamic range. The modulator adapts the step size of the quantizer from estimates of the quantizer input instead of the modulator input. In this study, we conduct an error variance analysis of the new modulator and derive expression for the SNR. The derived expression shows that the SNR is independent of the input signal strength, which supports the simulation results
Keywords :
adaptive modulation; circuit noise; error analysis; modulators; quantisation (signal); sigma-delta modulation; SNR performance; adaptive sigma delta modulator; dynamic range; error variance analysis; quantizer step size; Additive noise; Analysis of variance; Delta modulation; Delta-sigma modulation; Demodulation; Dynamic range; Equations; Error analysis; Signal analysis; Variable speed drives;
Conference_Titel :
Circuits and Systems, 2001. ISCAS 2001. The 2001 IEEE International Symposium on
Conference_Location :
Sydney, NSW
Print_ISBN :
0-7803-6685-9
DOI :
10.1109/ISCAS.2001.921875
