Abstract
In digital modulation quality parameters traceability, the Error Vector Magnitude, Magnitude Error and Phase Error must be traced, and the measurement uncertainty of the above parameters needs to be assessed. Although the calibration specification JJF1128-2004 Calibration Specification for Vector Signal Analyzers is published domestically, the measurement uncertainty evaluation is unreasonable, the parameters selected is incorrect, and not all error terms are selected in measurement uncertainty evaluation. This article lists formula about magnitude error and phase error, than presents the measurement uncertainty evaluation processes for magnitude error and phase errors.
Highlights
According to JJF1128-2004 Calibration Specification for Vector Signal Analyzers, digital modulation quality parameters are calibrated by direct comparison method
Error Vector Magnitude (EVM) will be first introduced before the evaluation of measurement uncertainty of digital modulation quality parameters are introduced
For magnitude error and phase error, its uncertainty source is the error of vector signal generated by the Vector Signal Generator (VSG), resolution of Vector Signal Analyzer (VSA) and measurement repeatability
Summary
According to JJF1128-2004 Calibration Specification for Vector Signal Analyzers, digital modulation quality parameters are calibrated by direct comparison method. Connect calibrated Digital Signal Generator (DSG) to a Vector Signal Analyzer (VSA) or a Spectrum Analyzer with the analyzing function of vector signal. Set the output frequency of the calibrated DSG, and generally the output level is set to -10 dBm. Select the required standard format or the customized modulation parameters, such as modulation, filter type, filter factor Į and symbol rate. Set the input frequency of the VSA equal to the one of calibrated DSG, and input level is -10 dBm or select Level Auto Range button to regulate the input level of VSA automatically. Select the required modulation standard format or set the modulation system, filter type, filter factor Į and symbol rate which is consistent with the VSG.
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