| Summary: | 碩士 === 國立臺灣科技大學 === 電機工程系 === 104 === 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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