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Error vector magnitude (EVM) is slowly becoming a mainstream production test. The reason? New and emerging standards utilizing complex digital modulation will require a system- level test to ensure all radios are on and functioning properly. Older ATE architectures using conventional methods required 5x to 10x more EVM test time than traditional parametric tests, which was the key factor postponing it from becoming a mainstream production test. But the time required for EVM testing can be reduced substantially by the development of algorithms that take advantage of the new ATE architectures. Since the signal from the arbitrary waveform generator never changes in a test scenario, the demodulation process is not necessary as part of the EVM calculation. This eliminates a large percentage of the traditional EVM test time.
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