
A cross-symmetric main&tail inductor with high area utilization is proposed originally. The designed inductor structure has advantages in both lower phase noise and area consumption when applied to LC-VCO. The inductor is composed of a pair of cross-symmetric octagonal main inductor and tail inductor. The tail inductor is used as noise filter, which can effectively suppress phase noise. Due to its cross-symmetric structural characteristics, the tail inductor will not generate obvious magnetic coupling interference with the main inductor.
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