Digital Test Method for Embedded Converters with Unknown-Phase HarmonicsReport as inadecuate

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1 SysMIC - Conception et Test de Systèmes MICroélectroniques LIRMM - Laboratoire d-Informatique de Robotique et de Microélectronique de Montpellier 2 Ophtimalia SAS

Abstract : This paper presents an extension of the ANC -Analogue Network of Converters-based method, which is an original Design-for-Test DfT technique associated to a dedicated test algorithm to characterize the harmonic components of a set of embedded converters using only digital test resources. The ANC-based method was primar- ily developed under the assumption that the harmonics- phase is proportional to the input phase. This assumption is not valid for all converter architectures, where filtering effects may affect the harmonics- phase. The improved ANC-based method is able to calculate the magnitude of the harmonic components with unknown phase. The fundamental principle of this improved version of the ANC-based method is the same, but further mathematical developments have been established using a model independent from the harmonics- phase. The simulation results and the experiments show an excellent agreement between the values measured using the method and the values measured with a usual test setup, for the THD and SFDR parameters. Simulations were carried out considering both random phases and realistic phase delays such as the ones induced by a low pass filter.

Keywords : Converter testing Harmonic characterization Unknown-phase harmonics Design-for-Test

Author: Vincent Kerzérho - Mariane Comte - Florence Azaïs - Philippe Cauvet - Serge Bernard - Michel Renovell -



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