本篇描述應用於無線感測網路生醫信號擷取之無線前端接收器，前端電路包含疊接式低雜訊放大器、主動式平衡器、折疊式偶次諧波混波器。平衡器是採用電阻電容迴授補償式差動放大器的架構，將單端輸入信號轉成差動信號。在本地震盪器前使用倍頻電路，將本地震盪器信號頻率加倍，因此可以避免由於本地震盪器信號洩漏而產生的自混頻。為了應用於低電壓架構且得到較大的本地震盪器信號穩定輸入範圍，偶次諧波混波器則利用摺疊的技術和互補式倍頻電路。本次設計之無線前端接收器電路操作在供應電壓1V，有8.5 dB的轉換增益，-36 dBm之輸入1-dB截斷點，及5.0 mW的功率損秏。

This work describes the design of a wireless receiver front-end circuit for Bio-Acquisition in Wireless Sensor Network (WSN). The front-end circuit includes a cascode low noise amplifier (LNA), an active balun and a folded-cascode even-harmonic mixer. The balun employs differential amplifier architecture utilizing the concept of RC feedback to transform single-ended signal into differential form. The frequency-doubling circuit in the LO stage is employed to double the LO frequency, thus the self-mixing resulted from LO leakage could be avoided. The even-harmonic (EH) mixer with folded technique and complementary frequency-doubling circuits is adopted for low voltage topology to achieve large stable LO turning range. This work possesses conversion gain of 8.5 dB, 1-dB compression point (IP1dB) of -36 dBm, power consumption of 5.0 mW at 1V supply voltage.

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