Abstract
As the fifth generation (5G) technology for broadband cellular networks, 5G has gained great popularity in recent years. Operating at millimeter wave (mmwave) frequency, the signal attenuation is high and the gain of transistors is limited, massive multiple input and multiple output (MIMO) and beamforming technology, which consists of an array of transceivers, are necessary to boost the output power. Coupled line circuits, especially baluns which converts the single-ended input into differential signals, and frequency conversion circuits are frequently used in transceiver systems. In this thesis, minimizing the balun insertion loss and chip area has been studied, together with their application in a frequency doubler. An edge- and broadside-coupled hybrid Marchand balun has been proposed to reduce the balun insertion loss; then another three parallel connected transformer type Marchand balun has been proposed with reduced chip area, and then integrated in a frequency doubler design. Besides, an in-phase and quadrature-phase (I/Q) bidirectional mixer with directional control has also been proposed for component reuse in the transmitting and receiving path, so as to save chip area. Coupled line based differential to quadrature generator has been designed to provide the balanced I/Q signals.