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Digital-to-RF mixed devices require accurate characterization to reveal the true RF front-end performance of modern transmitters and receivers. You can achieve highly accurate frequency response measurements on digital-to-RF mixed devices using cross-domain stimulus response with a signal generator and network analyzer. In receiver measurements, the RF signal generator outputs the desired signal, and the receiver-under-test receives and digitizes the signal. Two independent systems handle these tasks. Test engineers must effectively integrate signal generation with RF instruments and signal reception with the receiver-under-test for spectral correlation. This cross-domain approach includes a wideband multi-tone stimulus capability with a wideband analysis technique to yield the device's frequency response.
To bridge the digital and RF domains, test engineers need RF signal analyzers and generators with digital data and control interfaces for the transmitters- and receivers-under-test. The test waveform (digital or RF) is precisely defined and repeatedly played for the response wave (digital or RF) and can be coherently correlated at each spectral component with the stimulus waveform. The result is vector response measurements between input and output signals within the stimulus waveform bandwidth. This cross-domain stimulus response methodology yields RF performance characteristics of digital and RF mixed devices over frequency or power ranges in one set of measurements.
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