Look-ahead decision-feedback ΣΔ modulation

Author

Stonick, J.T. ; Rulla, J.L. ; Ardalan, S.H.

Author_Institution

Dept. of Electr. & Comput. Eng., Carnegie Mellon Univ., Pittsburgh, PA, USA

Volume

iii

fYear

1994

fDate

19-22 Apr 1994

Abstract

We present a novel solution to the problem of instability in multiloop ΣΔ modulators (nonlinear oversampled one-bit A/D and D/A converters). ΣΔ modulators are attractive because their SNR is proportional to their oversampling rate which is physically tied to the speed of the VLSI. The problem of instability in traditional higher order (multiloop) ΣΔ modulators is corrected by a new class of self-stabilizing ΣΔ modulators called look-ahead decision-feedback (LADF) ΣΔ modulators. LADF ΣΔ modulators select the output at each time-step to create the optimally stable set of integrator states at the following time-step. Simulation results for up to third order (triple loop) modulators are included

Keywords

analogue-digital conversion; circuit stability; digital-analogue conversion; sigma-delta modulation; signal sampling; ΣΔ modulation; SNR; VLSI; instability; integrator states; look-ahead decision-feedback; multiloop ΣΔ modulators; nonlinear oversampled one-bit ADC; nonlinear oversampled one-bit DAC; oversampling rate; self-stabilizing ΣΔ modulators; simulation results; third order modulators; Circuit noise; Delta modulation; Educational institutions; Filters; Frequency; Mathematics; Noise shaping; Quantization; Signal to noise ratio; Very large scale integration;

fLanguage

English

Publisher

ieee

Conference_Titel

Acoustics, Speech, and Signal Processing, 1994. ICASSP-94., 1994 IEEE International Conference on

Conference_Location

Adelaide, SA

ISSN

1520-6149

Print_ISBN

0-7803-1775-0

Type

conf

DOI

10.1109/ICASSP.1994.389970

Filename

389970