本論文使用TSMC CMOS 0.18 μm 1P6M製程，設計並實作一個應用於400-800MHz頻譜感測系統的射頻(RF)前端電路。此前端電路由一個低雜訊放大器及一混頻器組成。低雜訊放大器將接收到的微小訊號放大後，將訊號傳送至混頻器降頻至中頻訊號為200 kHz。此頻譜感測系統之感測範圍適用於醫療設備無線電通訊服務、數位電視頻帶及超高頻(UHF)頻段。
本論文設計之射頻前端電路，射頻前端電路整體功率消耗為14.85 mW，電路增益27-28 dB、線性度約為-14~ -15 dBm及雜訊指數約為4.87-6 dB。其子電路低雜訊放大器功率消耗為12.42 mW，S21為12.55-12.07 dB、線性度約為-2~ -3 dBm及雜訊指數約為3.3-4.0 dB。子電路混頻器功率消耗為2.43 mW，電路增益約為10-11dB、線性度約為-7~ -8 dBm及雜訊指數約為18-19dB。

In this thesis, a radio frequency front end circuit for 400-800 MHz spectrum sensing system is designed and implemented by using TSMC 0.18 μm 1P6M CMOS technology. The radio frequency front end circuit consists of a low noise amplifier (LNA) and a down-convert micromixer. The small signal is amplified by the low noise amplifier, then is applied to the micromixer down-converted to Intermediate Frequency at 200 kHz. The spectrum sensing system is applied to medical device radiocommunications service (Medradio), DTV band and UHF band.
The RF front end circuit in this thesis, it consumes 14.85 mW. Measurements of RF front end’s gain, linearity and noise figure are 27-28 dB, -14~-15 dBm and 4.87-6 dB. The LNA consumes 12.42 mW. Measurements of the LNA’s S21, linearity and noise figure are 12.55-12.07 dB, -2~-3 dBm and 3.3-4.0 dB. The micromixer consumes 2.43 mW. Measurements of the micromixer’s gain, linearity and noise figure are 10-11 dB, -7~-8 dBm and 18-19 dB.

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