頻率轉換電路為無線通訊系統的關鍵零組件。本論文以頻率轉換電路的研製為主，分為四部分。第一部分以0.18um CMOS製程實現非對稱寬面耦合混成電路的單平衡混頻器，操作頻率58-68 GHz，轉換損耗19.5-23.4 dB，LO-to-RF隔離度25.3-34.3 dB，LO-to-IF隔離度20.6-21.6 dB，面積約0.18 mm2。第二部分提出以功率分配器與開/短路殘段走線組成的雙重巴倫，以0.25um PHEMT製程實現星狀混頻器，最佳操作頻率為27-36 GHz，轉換損耗6.3-13.6 dB，LO-to-RF隔離度15.3-21.4 dB，LO-to-IF隔離度26.1-34.2 dB，面積約0.81 mm2。第三部分以雙馬遜巴倫與馬遜巴倫組成精簡雙平衡混成電路，以0.15um PHEMT製程實現星狀混頻器，操作頻率16-38 GHz，轉換損耗6.2-15 dB，LO-to-RF隔離度22.2-35.8 dB，LO-to-IF隔離度19-32.1 dB，面積約0.53 mm2。第四部分以慢波架構實現縮小化馬遜巴倫，以0.25um PHEMT製程實現單/雙平衡倍頻器。單平衡倍頻器的輸出頻率25-44 GHz，轉換損耗9-14.3 dB，主頻抑制大於25 dB，面積約0.37 mm2；雙平衡倍頻器的輸出頻率26-39 GHz，轉換損耗10.4-14.6 dB，主頻抑制大於33.7 dB，面積約0.61 mm2。

The frequency conversion circuit is an essential component of wireless communication systems. The implementation of broadband miniaturized frequency conversion circuits is the principal purpose of this thesis. First, a singly balanced mixer (SBM) with a hybrid of asymmetrical broadside coupled-lines is realized through a 0.18 um CMOS process. The measured conversion loss is 19.5-23.4 dB, the LO-to-RF isolation is 25.3-34.3 dB, and the LO-to-IF isolation is 20.6-21.6 dB at 58-68 GHz. The size of the SBM is only 0.18 mm2. Second, a novel dual balun composed of a power divider and open/short stubs is presented, which fabricates a star mixer through a 0.25 um PHEMT process. The measured conversion loss is 6.3 -13.6 dB, the LO-to-RF isolation is 15.3-21.4 dB, and the LO-to-IF isolation is 26.1-34 dB at 27-36 GHz. The chip size of the star mixer is 0.81 mm2. Third, a miniature doubly balanced hybrid composed of a dual Marchand balun and a Marchand balun is utilized to realize a star mixer within 0.53 mm2 of the core area through a 0.15 m PHEMT process. The measured conversion loss is 6.2-15 dB, the LO-to-RF isolation is 22.2-35.8 dB, and the LO-to-IF isolation is 19-32.1 dB at 16-38 GHz. Finally, the miniaturized Marchand balun that employs a slow-wave structure is presented. The structure fabricates a singly balanced doubler (SBD) and a doubly balanced doubler (DBD) through a 0.25 um PHEMT process. The size of the SBD is 0.37 mm2, the measured conversion loss is 9-14.3 dB, and the fundamental suppression is higher than 25 dB at 25-44 GHz. The size of the DBD is 0.61 mm2, the measured conversion loss is 10.4-14.6 dB, and the fundamental suppression is higher than 33.7 dB at 26- 39GHz.

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