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Design of a band-pass sigma-delta modulator with reduced number of opamps

Opened Access Design of a band-pass sigma-delta modulator with reduced number of opamps
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Autor: Pérez Vega-Leal, Alfredo
Muñoz Chavero, Fernando
González Carvajal, Ramón
Torralba Silgado, Antonio Jesús
Tombs, J. N.
García Franquelo, Leopoldo
Departamento: Universidad de Sevilla. Departamento de Ingeniería Electrónica
Fecha: 2000
Publicado en: Design of Circuits and Integrated Systems, 156-161. Montpellier, Francia : DCIS
Tipo de documento: Ponencia
Resumen: This paper is intended to compare the performance of a Band-Pass converter structure and its Low-Pass prototype 2nd order Sigma-Delta Analog to Digital converter. For this purpose Matlab simulations for the 4th order Band-Pass converter have been performed and its power consumption calculated when using the equivalent Op-Amp used m the Low-Pass modulator. First of all will be described the method used to calculate the transfer function and, thus the structure of the Band-Pass structure to be tested. After a band-pass transfer function has been obtained it is implemented using reduced number of opamps. This topology is compared to the existing ones and a system level simulation and characterisation is performed. Finally, jitter limitations are studied. Transistor level simulations using Spectre have been done in order to validate MATLAB simulations prior to layout design.
Tamaño: 341.3Kb
Formato: PDF


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