具有低雜訊指數和高轉換增益混頻器，可提升收發機訊號混頻之效能，低功率消耗可以使元件更不容易使越來越縮小化的產品模組產生過熱，然而主動元件因受製程寄生效應影響，會直接增加元件之雜訊度和減少元件對訊號放大之能力。本篇論文是針對CMOS混頻器，在本地振盪訊號輸入級，以並聯電感方式與電晶體寄生電容形成共振電路，藉此機制來降低混頻器雜訊指數和提高其轉換增益。針對射頻訊號頻率為2.45GHz，在本地振盪訊號頻率為2.25GHz和輸入功率為0dBm時，此混頻器之轉換增益與雜訊指數，分別為14.5dB和2.5dB，而功率消耗卻為3.96mW。在本論文的第二個設計中，以前一個設計為出發點，導入了gm-cell來改善線性度，針對射頻訊號頻率為2.45GHz，在本地振盪訊號頻率為2.25GHz和輸入功率為0dBm時，此混頻器之轉換增益與雜訊指數，分別為3.38dB和4.63dB，元件輸入三階截斷點為-8dB，而功率消耗為4.07mW。

Active Mixer having low noise figure and high conversion could enhance the efficient of signal mixing in receiver. Because of the parasitic effect inherent in an active device， it could directly enhance its noise figure and reduce the efficiency of the signal amplifying. In this thesis, the inductor was introduced in parallel with the parasitic capacitors to form a resonator circuit at the input of the local oscillation signal of an active mixer. Through resonating mechanism, the suppression of noise figure and the enhancement of conversion gain are obtained in an active mixer. Focusing on the radio frequency signal at 2.45GHz and local oscillating signal at 2.25GHz with input power of 0dBm, the mixer proposed in this paper has both conversion gain and noise figure 14.5dB and 2.5dB, respectively. Based on this design, another mixer is proposed in the thesis, based on improving linearity by inserting gm-cell to the circuit. Focusing on the radio frequency signal at 2.45GHz and local oscillating signal at 2.25GHz with input power of 0dBm, the mixer proposed in this paper has both conversion gain and noise figure 3.38dB and 4.63dB, IIP3 -8dB and power dissipation of 4.07mW,respectively.

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