本論文主要係使用具寬頻抑制止帶之濾波器作為選頻元件研製迴授振盪器，由於濾波器具有較單一共振器優異之品質因數及諧波抑制之特性，因此可有效改善振盪器之相位雜訊效能。本論文使用印刷電路板及砷化鎵積體電路製程研製濾波器型式之迴授壓控振盪器。電路板電路部分，使用二階及三階濾波器研製振盪器，其結果呈現於論文第三章中。當使用之濾波器階數愈高，亦即該選頻元件品質因數較佳時，可獲致較佳之相位雜訊效能。使用砷化鎵積體電路製程設計振盪器主要用以驗証該新式振盪電路架構實現於積體電路中的可能性。

The aim of this thesis is to use a harmonic-suppressed filter as a frequency selective element, and then apply to design a feedback oscillator. Since the filter has a higher quality factor than that of a single resonator, and has the harmonic suppressions, the oscillator designed with a filter can improve the phase noise performance. This thesis use the printed circuit board (PCB) and the GaAs integrated circuit (IC) fabrication process to implement feedback voltage-controlled oscillator (VCO) based on the developed filters. For the PCB approach, the 2-pole and 3-pole filters are employed to design the VCOs, and their results are presented in Chapter 3. As a high order filter is adopted, namely the frequency selective element with a higher quality factor, the oscillator will achieve a better phase-noise performance. In addition, the proposed filter-based oscillator are re-designed and fabricated in the GaAs IC process to demonstrate the potential of realizing this type of oscillator in the IC process.

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