Resonation-based hybrid continuous-time/discrete-time cascade sigma-delta modulators: application to 4G wireless telecom

José M. de la Rosa; Alonso Morgado; Rocío del Río

doi:10.1117/12.820910

28 May 2009 Resonation-based hybrid continuous-time/discrete-time cascade ΣΔ modulators: application to 4G wireless telecom

José M. de la Rosa, Alonso Morgado, Rocío del Río

Author Affiliations +

Proceedings Volume 7363, VLSI Circuits and Systems IV; 73630C (2009) https://doi.org/10.1117/12.820910
Event: SPIE Europe Microtechnologies for the New Millennium, 2009, Dresden, Germany

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.

Citation Download Citation

José M. de la Rosa, Alonso Morgado, and Rocío del Río "Resonation-based hybrid continuous-time/discrete-time cascade ΣΔ modulators: application to 4G wireless telecom", Proc. SPIE 7363, VLSI Circuits and Systems IV, 73630C (28 May 2009); https://doi.org/10.1117/12.820910

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KEYWORDS

Modulators

Quantization

Signal to noise ratio

Electronic filtering

Global system for mobile communications

Interference (communication)

Lawrencium

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