| Summary: | 碩士 === 長庚大學 === 電子工程學系 === 99 === In this thesis，X- and C-band mixer circuits with image rejection functions have been realized by using 0.5 μm pHEMT and 0.15 μm pHEMT process, respectively.
The X-band Gilbert cell down-conversion mixer was designed at 12 GHz with the bandwidth from 5 to 20 GHz. An extra inductor was added to enhance the conversion gain. The conversion gain is 8 dB, is -16 dBm，IIP3 is about 6 dBm, and total power consumption is about 60 mW.
For C-band image rejection down- and up-conversion mixers, the image signal can be suppressed by phase cancellation approach. The measured results of up-conversion mixer show that the conversion loss of -5.5 dB and image rejection ratio of 20 dB in desired band, isolation between each port is better than 20 dB, and IIP3 is -4 dBm with power consumption of 120 mW. Moreover, the measured results of down-conversion mixer show that the conversion gain of 0.5dB, image rejection ratio of 21 dBm, and IIP3 of -4.5 dBm with power consumption of 63mW.
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