Understanding the performance of your baseband modem is essential because it directly affects RF performance and is where most of the intelligence resides. You can easily achieve this understanding using Baseband Studio for capture and playback. By linking directly into the 89600 Series VSA software, you can make on-line measurements or post-process the data after it is captured. Modulation accuracy such as error vector magnitude (EVM) and phase and amplitude deviations can be measured directly from the digital IQ signals, which means you obtain the true performance of the baseband modem without distortion from the RF chain.
Figure 8. VSA software
makes accurate measurements from the captured digital IQ
signals to reveal the true design performance without added RF distortions.