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Efficient Hybrid Continuous-Time/Discrete-Time Cascade Modulators for Wideband Applications

Opened Access Efficient Hybrid Continuous-Time/Discrete-Time Cascade Modulators for Wideband Applications

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Autor: García Sánchez, Gerardo
Rosa Utrera, José Manuel de la
Fecha: 2014
Publicado en: Microelectronics Journal, 45 (10), 1234-1246.
Tipo de documento: Artículo
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 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 (discr...
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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.
Tamaño: 830.7Kb
Formato: PDF

URI: https://hdl.handle.net/11441/74633

DOI: 10.1016/j.mejo.2013.10.017

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