Titlebook: Nanometer CMOS Sigma-Delta Modulators for Software Defined Radio; Alonso Morgado,Rocío del Río,José M. Rosa Book 2012 Springer Science+Bus

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,ΣΔ ADCs: Basic Concepts, Topologies and State of the Art,ntation to telecom [Nors97a][Mede99][Geer02][Schr05b][Ortm06]. This type of A/D converters (ADCs), composed of a low-resolution quantizer embedded in a negative feedback loop, uses oversampling (a sampling frequency much larger than the Nyquist frequency) to reduce the quantization error and åD modu

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,New ΣΔ Cascade Modulators for the Next Generation of Wireless Telecom,er single-loop SDMs or, alternatively, by cascading low-order stages—and multi-bit embedded quantizers—that leads to the use of multi-bit DACs and DEM for medium-to-high ENOB specifications. A different approach, fully compatible with the former strategies, is based on the optimal spreading of notch

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,A 1.2-V 90-nm CMOS Adaptive Concurrent Resonation-Based 2-2-2 Cascade ΣΔM for SDR, of wireless standards will help to boost the needed flexibility, while making more efficient use of the available hardware. The ΣΔM introduced in this chapter implements several flexible strategies. Apart from all the reconfiguration strategies used in Chaps. 4 and 5, concurrency and resonation are

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