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Proceedings Paper

Resonation-based hybrid continuous-time/discrete-time cascade sigma-delta modulators: application to 4G wireless telecom
Author(s): José M. de la Rosa; Alonso Morgado; Rocío del Río
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Paper Abstract

This paper presents innovative architectures of hybrid Continuous-Time/Discrete-Time (CT/DT) cascade ΣΔ Modulators (ΣΔMs) made up of a front-end CT stage and a back-end DT stage. In addition to increasing the digitized signal bandwidth as compared to conventional ΣΔMs, the proposed topologies take advantage of the CT nature of the front-end ΣΔM stage, by embedding anti-aliasing filtering as well as their suitability to operate up to the GHz range. Moreover, the presented modulators include multi-bit quantization and Unity Signal Transfer Function (USTF) in both stages to reduce the integrator output swings, and programmable resonation to optimally distribute the zeroes of the overall Noise Transfer Function (NTF), such that the in-band quantization noise is minimized for each operation mode. Both local and inter-stage (global) based resonation architectures are synthesized and compared in terms of their circuit complexity, resolution-bandwidth programmability and robustness with respect to circuit non-ideal effects. The combination of all mentioned characteristics results in novel hybrid ΣΔMs, very suited for the implementation of adaptive/reconfigurable Analog-to-Digital Converters (ADCs) intended for the 4th Generation (4G) of wireless telecom systems.

Paper Details

Date Published: 28 May 2009
PDF: 12 pages
Proc. SPIE 7363, VLSI Circuits and Systems IV, 73630C (28 May 2009); doi: 10.1117/12.820910
Show Author Affiliations
José M. de la Rosa, Instituto de Microelectrónica de Sevilla (Spain)
Alonso Morgado, Instituto de Microelectrónica de Sevilla (Spain)
Rocío del Río, Instituto de Microelectrónica de Sevilla (Spain)

Published in SPIE Proceedings Vol. 7363:
VLSI Circuits and Systems IV
Teresa Riesgo; Eduardo de la Torre; Leandro Soares Indrusiak, Editor(s)

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