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Over the past 20 years, radio frequency (RF) and microwave signal generators have grown in capability and complexity to keep pace with the swift advances of vector-modulated communications and radar systems. In these applications, phase noise is one of the most critical performance parameters for signal generators and the systems under test. For example, Doppler radar applications require excellent close-in phase noise to enable accurate simulation and testing of moving target indicator (MTI) systems.
To address these needs, some off-the-shelf generators offer “low phase noise” options that offer meaningful improvement. Test engineers can extend the benefits of these options by taking advantage of additional capabilities that further improve phase noise performance. Examples include access to the internal reference hardware, voltage-controlled oscillators (VCOs) and phase-locked loops (PLLs) within the synthesizer chain—provided the standard signal generator or its options provide these features.
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