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April 2011 [Education] Select A VCO or YIG For A PLL Synthesizer? Historically, high-performance phase-lock-loop (PLL) frequency synthesizers have relied on yttrium-iron-garnet (YIG) oscillators featuring broadband operation and excellent phase noise. YIG-tuned oscillators also offer very linear and repeatable tuning characteristics that simplify the synthesizer coarse tuning in multiloop schemes. These unique features provided the domination of the YIG-based designs in high-end applications such as test-and-measurement ... October 2008 [Components] Novel Approach Yields Fast, Clean Synthesizers Frequency synthesizers are invaluable components in many systems, from commercial communications networks to test and measurement instruments.1 Because of their wide application, the RF/microwave industry constantly feels the pressure to deliver higher-performance, higher-functionality, smaller-size, and lower-cost synthesizer designs. In addition, as dictated by the ever-increasing data rates of modern communications systems, a major challenge in synthesizer ... |
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