Artículo
Efficient Hybrid Continuous-Time/Discrete-Time Cascade Modulators for Wideband Applications
Autor/es | García Sánchez, Gerardo
Rosa Utrera, José Manuel de la |
Fecha de publicación | 2014 |
Fecha de depósito | 2018-05-15 |
Publicado en |
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Resumen | This paper analyses the use of hybrid continuous-time/discrete-time cascade ΣΔ modulators for the implementation of power-efficient analog-to-digital converters in broadband wireless communication systems. Two alternative ... This paper analyses the use of hybrid continuous-time/discrete-time cascade ΣΔ modulators for the implementation of power-efficient analog-to-digital converters in broadband wireless communication systems. Two alternative implementations of multi-rate cascade architectures are studied and compared with conventional single-rate continuous-time topologies, taking into account the impact of main circuit-level error mechanisms, namely: mismatch, finite dc gain and gain-bandwidth product. In all cases, closed-form design equations are derived for the nonideal in-band noise power of all ΣΔ modulators under study, providing analytical relationships between their system-level performance and the corresponding circuit-level error parameters. Theoretical predictions match simulation results, showing that the lowest performance degradation is obtained by a new kind of multi-rate hybrid ΣΔ modulator, in which the front-end (continuous-time) stage operates at a higher rate than the back-end (discrete-time) stages. As a case study, the design of a hybrid GmC/switched-capacitor fourth-order (two-stage, 4-bit) cascade ΣΔ modulator is discussed to illustrate the potential benefits of the presented approach |
Agencias financiadoras | Ministerio de Economía y Competitividad (MINECO). España |
Identificador del proyecto | TEC2010-14825/MIC |
Cita | García Sánchez, G. y Rosa Utrera, J.M.d.L. (2014). Efficient Hybrid Continuous-Time/Discrete-Time Cascade Modulators for Wideband Applications. Microelectronics Journal, 45 (10), 1234-1246. |
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Effcient Hybrid Continuous Time.pdf | 830.7Kb | [PDF] | Ver/ | |