Phase Shifters for 5G Communication at Millimeter Wave Band and Ka-Band Satellite System Using CMOS Process
2019
Hochschulschrift
Zugriff:
107
This thesis presents two vector-sum phase shifters. The first vector-sum phase shifter uses active IQ signal generator and can be used for satellite receiver system at Ka band. The second one uses phase compensation variable gain amplifier and can be used for 5G millimeter wave communication system at Ka band. The first phase shifter uses active IQ signal generator to provide positive quadrature signal, these signals can then be inverted by bi-phase modulators, so we can generate signals at four quadrants. Finally, we use vector adder to adjust amplitude of I/Q signals, and synthesize desired phase. This circuit is implemented by TSMC 0.18 μm CMOS technology. The measured RMS phase error and amplitude error at 19 GHz are 0.31° and 0.63 dB, the average gain is -1.25 dB and average DC power consumption is 10 mW. The second phase shifter use passive 90° coupler, and bi-phase modulator to generate signals at four quadrants, I/Q signals then go through at 3-stage variable gain amplifier with phase compensation. The final stage of variable gain amplifier is a cascode amplifier which can reduce the variation of output impedance under phase change. The phase compensation is implemented in the middle stage, to mitigate the phase variation, by connecting a small varactor to common gate of cascode amplifier and inductor to common source of cascode amplifier. This circuit is implemented by TSMC 0.18 μm CMOS technology, the measured RMS phase error and amplitude error at 28 GHz are 0.6° and 0.57 dB, the average gain is -4.73 dB and average DC power consumption is lower than 10.5 mW.
Titel: |
Phase Shifters for 5G Communication at Millimeter Wave Band and Ka-Band Satellite System Using CMOS Process
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Autor/in / Beteiligte Person: | Wang, Wen-Yu ; 王文裕 |
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Veröffentlichung: | 2019 |
Medientyp: | Hochschulschrift |
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