本論文係以CMOS製程研製應用於802.11a (5.2GHz) 、802.11b/g (2.4GHz)雙頻降頻器之CMOS RFIC。共計電路有雙頻差動低雜訊放大器、CMOS 微混頻器及互補式壓控振盪器。其中雙頻差動低雜訊放大器,本電路利用Inductive Source Degeneration 架構,在匹配網路上設計,使低雜訊放大器工作在兩個頻帶上達成雙頻帶的效果;CMOS 微混頻器上採用LC串聯、並聯電路做匹配,達到寬頻匹配的效果,並加入了“Charge-Injection”的方法來改善“voltage headroom”的問題,並同時提高線性度的表現;互補式壓控振盪器以2.5GHz為基頻的振盪器為出發點,透過電路的調整,以期達成2.5/5GHz的雙頻帶需求,能夠完整達成雙頻帶接收機系統。
This thesis presents the design and implementation of CMOS RFICs for 802.11a (5.2Ghz)、802.11b/g (2.4GHz) WLAN receiver in a CMOS process. The developed CMOS RFICs includes a dual-band differential LNA, CMOS micro-mixer, a complementary VCO. The dual-band differential LNA use Inductive source degeneration structure, a matching network is used for the LNA to develop dual-band. The micro-mixer use a matching network shunt and parallel LC elements to develop wide-band matching. The biasing method reduces the“voltage headroom” difficulties inherent to the Gilbert cell, and the mixer linearity can be improved using this biasing method “Charge -Injection”by accurate adjustment of the input MOSFET operating point. The complementary VCO based on 2.5GHz, and tuning output buffer to approach 2GHz/5GHz dual-band for dual-band down-converter with MMIC technology.
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