| Summary: | 碩士 === 國立臺灣大學 === 電信工程學研究所 === 95 === Mixer plays an important role in a transceiver system. The characteristics affect the performance of the system. A modulator is also very important in a direct-conversion system. Therefore, to design high frequency mixers and modulators with good performance is important.
The goal of the thesis is to design and implement wideband mixers and high frequency IQ modulator. The thesis includes three parts. The first part introduces the basic concept and design parameters of the mixers and modulators. In the second part, we employed the distributed topology to design a wideband sub-harmonic mixer. The concept of distributed circuits will also be described in this part. The distributed sub-harmonic mixer was fabricated using TSMC 0.13-um CMOS technology. From the measurement results, the mixer achieved a conversion loss of 11 dB from 30 to 68 GHz with a compact size of 0.36 mm2. In addition, a bulk-pumped fundamental mixer is designed and implemented in this part and the theory is introduced. With the advantages of low supply voltage and power consumption, the mixer demonstrates a conversion gain of -3 to 0 dB from 11 to 35 GHz. The total power consumption is only 6 mW, included the IF output buffer amplifier.
Finally, a sub-harmonic IQ modulator using TSMC 90-nm CMOS technology is implemented and the design concept is also presented. How the matching network between mixer cell and 90° phase shifter affects the image rejection will also be discussed.
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