Improvement on technology using CW combination to calibrate vector signal analyzer

The paper addresses the problems about calibration of vector modulation error such as EVM: first, lacks traceability. Second, lack of error setting. To solve the problems, we proposed “CW combination method” three years ago, which is using combination of CW to calibrate vector signal analyzers in the aspect of MPSK modulation. This paper presents the technical improvement of “CW combination method” in 3 terms: 1, improved traceability formulas of MagErrRms and PhaseErrRms, the new formula is more accurate. 2, improvement on operational method and uncertainty analysis. 3. application in the calibration of high-order modulation such as 16QAM, 64QAM. Based on improved “CW combination method”, metrology standard of EVM, MagErrRms and PhaseErr to calibrate Vector Signal Analyzer is established, and expanded combined uncertainty of EvmRms is less than 0.151% in the range of 0~30%.