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Millimeter-wave (mm-wave) band is attracting worldwide attention for 5G/6G communication, automotive radar, high-resolution imaging, etc. These mm-wave systems require high efficiency, large bandwidth, high output power, and low phase noise. To simultaneously meet these requirements, a high-performance approach is to cascade a synthesizer with a multiplier(s). Among different multipliers, quadrupler is promising to balance the multiplication factor with efficiency, and it provides high performance from low-frequency synthesizers.
Lin et al. (Sun,) studied this question.
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