本論文分為三個部分，主要研製應用於微波與毫米波頻段之射頻前端系統之電路。第一部分首先提出一個採用 WIN 0.15 μm pHEMT製程的寬頻次諧波混頻器，克服了傳統的次諧波混頻器電路因為使用λLO/4的開路與短路微帶線，所以難以達成寬頻操作的特性，本論文使用同時提供射頻之功率分配與本振訊號平衡至不平衡轉換的功能之新式巴倫，除了達成晶片精簡化的目的，並且頻寬有37~80 GHz。
第二部分實現一個36GHz可調式的四位元相移器，電路採用三組高通濾波器架構，搭配一組高通／低通濾波器架構之180°相移控制器，開關電路全採用二極體，比起使用FET元件作為開關，可減少將近一半的偏壓電源，有效地降低電路複雜度，並且維持低插入損耗之變化。量測結果在36 GHz時，插入損耗為12.5dB，變化量為約為±1.5dB，返回損耗皆大於10dB。
第三部分則使用TSMC 90 nm製程實現了應用於24 GHz車用防撞雷達的再生式正交相位除三除頻器，從模擬結果可看出擁有再生式除頻器的寬可調頻率範圍以及低相位雜訊的特性：從17 GHz到25 GHz(38%)，距中心頻率1 MHz時最好的相位雜訊為-145.5 dBc/Hz。

This thesis focuses on the design of microwave and millimeter-wave front-end circuits. It is divided into three parts. A wideband sub-harmonic pumped mixer using WIN 0.15 m pHEMT is the first challenge. The bandwidth limitation of traditional circuits using quarter-wavelength microstrip lines has been solved. A new type of balun is proposed, which can provide both the functions of power division and balance-to-unbalance transformation. The bandwidth is extended to 37-80 GHz and also the size is reduced.
In the second part of this thesis, a 36 GHz adjustable four-bit phase shifter is realized. It consists of three high-pass filters and one 180° phase shifter based on high-pass/low-pass filter structures. Diode switches are used instead of their FET counterparts. They need only about half of the bias power sources and significantly reduce the circuit complexity. It achieves a 4-bit 360° phase-tuning range, while the variation of the insertion losses is low. The insertion loss is 12.5±1.5dB at 36 GHz. The return losses are better than 10dB.
Finally, a quadrature phase divided-by-three frequency divider for 24GHz automotive collision avoidance radars is realized by TSMC 90 nm process. From the results of the simulations, it is observed that the frequency tuning range of this regenerative divider is wide, from 17 GHz to 25 GHz (38%), with very low phase noise, about -145.5 dBc/Hz one MHz away from the carrier.

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