| Summary: | 碩士 === 國立臺北科技大學 === 電腦與通訊研究所 === 102 === Conventional baluns and circulators are both 3-port components, and play an important role in the RF front-end circuit. In the application of active baluns, active baluns unlike passive baluns cause losses, they can provide extra gain. However, the isolation of active balun is poor due to the structure of the circuit and parasites. Therefore, they usually needs additional buffers to enhance the isolation, and then consume more power. In the application of circulators, a circulator is the component that can do transmit and receive simultaneously by single antenna, and it is generally differ from the conventional switch circuits, which do transmit and receive by rapid switching. Owing to the passive circulator which forms huge volume is manufactured by ferrite; it is difficult to be fabricated on the integrated circuit. From this point, transform the passive circulator to be active one is necessary.
In this thesis, an active balun and two different active circulators are designed. The active balun utilizes the bridge-T network to replaces the function of buffer and it also reduce the power consumption and enhance the isolation. Furthermore, for low phase error, the phase correction technique is also needed in the active balun. The active circulators utilize the identical unit cell by connecting in the ring-type configuration, one of the active circulators utilizes the existing quasi-circulator as a unit cell, and the other one utilizes the bridge-T network. The two configurations are all work well in achieving the 3-port circulator. Chapter 2 presents the implementation and discussion of proposed active balun, and chapter3 presents the proposed active circulators. All the circuits are fabricated in TSMC 0.18um CMOS 1P6M process.
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