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Título : Effect of Clock Jitter Error on the Performance Degradation of Multi-bit Continuous-Time ΣΔ Modulators With NRZ DAC
Autor : Tortosa, Ramón ; Rosa, José M. de la ; Rodríguez-Vázquez, Ángel ; Fernández, Francisco V.
Palabras clave : Clock jitter
Continuous-Time Circuits
Fecha de publicación : nov-2005
Citación : R. Tortosa, J.M. de la Rosa, A. Rodríguez-Vázquez and F.V. Fernández: "Effect of Clock Jitter Error on the Performance Degradation of Multi-bit Continuous-Time ΣΔ Modulators with NRZ DAC". Proceeding of the 2005 Conference on Design of Circuits and Integrated Systems, Lisbon, November 2005.
Resumen: This paper analyses the effect of the clock jitter error in multi-bit continuous-time ΣΔ modulators with non-return-to-zero feedback waveform. Derived expressions show that the jitter-induced noise power can be separated into two main components: one that depends on the modulator loop filter transfer function and the other one due to the input signal parameters, i.e amplitude and frequency. The latter component, not considered in previous approaches, allows us to accurately predict the resolution loss caused by jitter, showing effects not taken into account up to now in literature which are specially critical in broadband telecom applications. Moreover, the use of state-space formulation makes the analysis quite general and applicable to either cascade or single-loop architectures. Time-domain simulations of several modulator topologies intended for VDSL application are given to validate the presented analysis.
URI : http://hdl.handle.net/10261/3846
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