Compact frequency synthesizers fill many needs in modern communications systems. To achieve full-sized performance in miniature packages, Synergy Microwave has developed a line of compact frequency synthesizers that leverage novel, patented voltage-controlled-oscillator (VCO) technology " for the stability and low noise needed for emerging wideband, high-data-rate wireless communications systems.rnTo overcome the limitations of VCOs based on three-dimensional (3D) resonators, which do not lend themselves to integrated-rncircuit (IC) realizations, the designers at Synergy Microwave were able to shrink planar resonators while also applying a unique evanescent-mode electromagnetic (EM) coupling mechanism to improve the loaded quality factor (Q) of the coupled planar resonators and thus reduce the phase noise. The result is a line of patent-pending coupled-planar-resonator VCOs that fit in packages just 0.3 × 0.3 in. but can match the phase-noise performance of much larger, high-Q resonator-based oscillators.
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