Low-Cost EVM Measurement of ZigBee Transmitters From 1-bit Undersampled Acquisition - LIRMM - Laboratoire d’Informatique, de Robotique et de Microélectronique de Montpellier Access content directly
Journal Articles IEEE Transactions on Computer-Aided Design of Integrated Circuits and Systems Year : 2021

Low-Cost EVM Measurement of ZigBee Transmitters From 1-bit Undersampled Acquisition

Abstract

Error Vector Magnitude (EVM) or alternately Offset Error Vector Magnitude (OEVM) is one of the most important performance to verify for RF circuits such as ZigBee transmitters in order to ensure that the quality of the generated modulated-signal complies with the requirements of the wireless communication standard. The conventional solution to measure this performance relies on the use of an Automatic Test Equipment (ATE) equipped with expensive RF channels. This paper presents a low-cost solution that permits to realize EVM measurement using only a standard digital ATE. The approach is based on 1-bit under-sampled acquisition of the RF modulatedsignal by a digital tester channel associated with a specificallytailored processing algorithm. This algorithm involves many different steps that are detailed in this paper, including phase and amplitude fluctuation extraction, RF signal reconstruction, symbol clock recovery, symbol bits detection and synthesis of reference data for EVM calculation. The proposed digital test solution is first evaluated through lab hardware experiments and then validated with EVM measurements on an industrial ATE.
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Dates and versions

lirmm-03426162 , version 1 (12-11-2021)

Identifiers

Cite

Thibault Vayssade, Florence Azaïs, Laurent Latorre, François Lefèvre. Low-Cost EVM Measurement of ZigBee Transmitters From 1-bit Undersampled Acquisition. IEEE Transactions on Computer-Aided Design of Integrated Circuits and Systems, 2021, 40 (11), pp.2400-2410. ⟨10.1109/TCAD.2020.3043318⟩. ⟨lirmm-03426162⟩
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