Traceable Measurement of Source and Receiver EVM Using a Real-Time Oscilloscope

A method to traceably calibrate wideband code-division multiple-access (WCDMA) error vector magnitude (EVM) contributions of a source or a receiver is described using a real-time digital oscilloscope as the reference receiver. The results and uncertainties are presented for a receiver calibrated using four WCDMA sources from different manufacturers. The weighted mean EVM of the receiver at 900 MHz is 0.35 <formula formulatype="inline"><tex Notation="TeX"> $\pm$</tex></formula> 0.03% at 95% confidence. Measurement results at 1780 and 2510 MHz are also reported.

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