本論文係使用TSMC 0.18 µm CMOS製程研製三顆應用於5.8 GHz非接觸式生理訊號雷達感測系統之主動式混頻器，分別為雙平衡混頻器、壓控振盪器與混頻器整合電路及低功耗雙平衡混頻器。雙平衡混頻器之負載級採用共模回授架構，以提升混頻器的線性度，其匹配網路則以RLC元件來實現。接著，將壓控振盪器與混頻器整合於單一晶片中，壓控振盪器採用LC互補式電晶體架構，具有較佳之相位雜訊。混頻器輸出端則使用LC低通濾波器抑制高頻諧波，以降低諧波對整體電路特性之影響。低功耗雙平衡混頻器之閘極偏壓設計於次臨界傳導區，並採用閘極注入式架構，以兼顧直流功率消耗與轉導值，且平衡-不平衡轉換器亦整合於單一晶片中。

This thesis presents three active mixers, namely doubly-balanced mixer, mixer with embedded VCO, and low-power gate-driven mixer, for the non-contact vital-sign radar sensor applications. All the developed mixers are fabricated in the TSMC 0.18 μm CMOS process. The load stage of the doubly-balanced mixer employs the common-mode feedback architecture to enhance the linearity of the mixer. In addition, the matching network is designed by the RLC lumped elements. The doubly balanced mixer is then integrated with an embedded VCO in a chip. The voltage-controlled oscillator adopts the LC complementary transistor architecture to achieve a better phase-noise performance. The LC lowpass filter is designed and connected with the output of mixer to suppresses the high frequency harmonics. By designating the gate bias in the subthreshold conduction region, the low-power gate-driven mixer can be implemented by considering the trade off of the DC power consumption and transconductance. Moreover, the baluns are also integrated in the chip.

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