Title :
An investigation of bandpass sigma-delta A/D converters
Author :
Botteron, Yvan ; Nowrouzian, Behrouz
Author_Institution :
Dept. of Electr. & Comput. Eng., Calgary Univ., Alta., Canada
Abstract :
This paper presents an investigation of the performance characteristics of a pair of bandpass Sigma-Delta (Σ-Δ) analog-to-digital (A/D) converters. One of these Σ-Δ A/D converters has the conventional cascade-of-integrators structure while the other has the conventional cascade-of-resonators structure. These Σ-Δ A/D converters are subsequently compared in terms of their achievable signal-to-quantization noise ratios for corresponding (discrete) switched-capacitor implementations. Based on this comparison, a new bandpass Σ-Δ A/D converter structure is proposed which possesses the best practical features of both converters. These include, complementary signal and noise transfer functions and the fact that the zeros of the noise transfer function are constrained to lie on the unit-circle
Keywords :
cascade networks; circuit noise; poles and zeros; sigma-delta modulation; switched capacitor networks; transfer functions; A/D converters; SC implementations; bandpass sigma-delta ADC; cascade-of-integrators structure; cascade-of-resonators structure; noise transfer function; performance characteristics; signal-to-quantization noise ratios; switched-capacitor implementations; Analog-digital conversion; Delta-sigma modulation; Filtering theory; Frequency conversion; Multi-stage noise shaping; Quantization; Sampling methods; Signal resolution; Signal to noise ratio; Transfer functions;
Conference_Titel :
Circuits and Systems, 1997. Proceedings of the 40th Midwest Symposium on
Conference_Location :
Sacramento, CA
Print_ISBN :
0-7803-3694-1
DOI :
10.1109/MWSCAS.1997.666091
