第五代通訊系統關鍵元件之設計與研究

陳政宇

doi:10.6342/NTU201704414

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第五代通讯系统关键元件之设计与研究

Design and Research of Key Components for Fifth Generation Communication Systems

陈政宇 , 硕士　　导师：王晖　　

英文 DOI： 10.6342/NTU201704414

可变增益放大器；相移器；数位控制人造介质传输线； I/Q 调变器；镜像抑制率； 38 GHz ；毫米波； variable gain amplifier ； phase shifter ； digital controlled artificial dielectric ； I/Q modulator ； image reject ratio ； 38 GHz ； millimeter-wave

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摘要 │ 参考文献 (71) │ 国际计量

摘要〈TOP〉

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In this thesis, three key components of the fifth generation (5G) communication systems, including a low phase variation variable gain amplifier (VGA), an ultra-low RMS phase error phase shifter and a high-speed I/Q modulator are proposed.
In chapter 2, a low phase variation and high gain control range VGA using 65-nm CMOS process is applied on a 38 GHz phased-array system. The phase compensation is achieved by combining the current-steering and bias-adjusting topologies due to their opposite trend of phase variation when tuning the gain. Moreover, the triple-cascode structure is adopted in the second stage with bias adjusting technique which can largely improve the gain control range. This VGA performs the phase variation of only 6.5°with over 32 dB gain control range. Besides, with 52 mW power consumption, this circuit can obtain the peak gain of 23.6 dB with the 3-dB bandwidth from 33 to 48 GHz and the OP1dB of 6.2 dBm. An ultra-low RMS phase error phase shifter with a novel phase compensation technique by using digital controlled artificial dielectric (DiCAD) transmission line is described and analyzed in Chapter 3. Unlike other passive phase shifters, this phase shifter consist of a vector generator, a vector selector and two DiCAD phase shifter cells to achieve 22.5° phase resolution (4-bit) and full 360° synthesizing. The measured RMS phase error and gain error are under 2.6 ̊ and 2.6 dB over 36 to 40 GHz, respectively. The average insertion gain is -20.2 dB with no dc consumption. With the proposed novel phase compensation technique, this phase shifter successfully demonstrate an outstanding performance on RMS phase error. 
Finally, a 38 GHz high-speed I/Q modulator fabricated in 90-nm CMOS is proposed in chapter 4. By adopting weak-inversion biasing modified Gilbert-cell mixers in I/Q paths, this modulator can save dc power consumption and LO power requirement while providing competitive gain performance simultaneously. The measured results show that it can provide -2±1 dB conversion gain with only 28.8 mW dc power and 0 dBm LO power. Besides, for high-speed transmission, a precise quadrature signal generator is designed to minimize the I/Q imbalance, this modulator can demonstrate better than -35 dBc image reject ratio (IRR) at 38 GHz and is verified by several high-level quadrature amplitude modulation (QAM) experiments.

参考文献 ( 71 ) 〈TOP〉

[1] A. Sulyman et al., “Radio propagation path loss models for 5G cellular networks in the 28 GHz and 38 GHz millimeter-wave bands,” IEEE Commun. Mag., vol. 52, no. 9, pp. 78–86, Sep. 2014.
连结：
[2] Z. Pi and F. Khan, “An Introduction to Millimeter-Wave Mobile Broadband Systems,” IEEE Commun. Mag., vol. 49, no. 6, June 2011, pp. 101–07.
连结：
[3] T. S. Rappaport et al., “Millimeter Wave Mobile Communications for 5G Cellular: It Will Work!,” IEEE Access, vol. 1, May 2013, pp. 335–49.
连结：
[4] D. Roques, J. Cazaux, and M. Pouysengur, “A new concept to cancel insertion phase variation in MMIC amplitude controller,” in Proc. IEEE Symp. Microwave and Millimeter-Wave Monolithic Circuits, May 1990, pp. 59–62.
连结：
[5] H. Takasu, C. Sakakibara, M. Okumura, and S. Kamihashi, “S-band MMIC digital attenuator with small phase variation,” in Proc. IEEE Asia-Pacific Microwave
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引用含有DOI的文献

DOI可强化引用精确性、增强学术圈连结，并给予使用者跨平台的良好使用经验，目前在全世界已有超过五千万个对象申请DOI。 如想对DOI的使用与概念有进一步了解，请参考 （ ） 。

DOI可强化引用精确性、增强学术圈连结，并给予使用者跨平台的良好使用经验，目前在全世界已有超过五千万个对象申请DOI。如想对DOI的使用与概念有进一步了解，请参考（）。