2.22~2.9GHz 광대역 4위상 국부 신호 발생기 설계

In this paper, an wide band quadrature LO signal generator and I/Q phase adjustor are presented. LO signal generator is consisted of the wide band operating VCO, I/Q frequency divider, and other buffers. The designed W-VCO can be obtained oscillation frequency of 4.8∼5.8 GHz using the 4-bit cap band circuit. And an I/Q frequency divider is designed to divide the output frequency of the W-VCO stably. In addition, the designed I/Q phase adjustor can be controlled the output phase of 6° by control voltage (Vc). The proposed circuits are implemented in 0.13um RF-CMOS process of TSMC.