Broad-band direct QPSK modulator/demodulator for wireless gigabit communication

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• 作者：YuXiong Cao (1) (2)
  DanYu Wu (1) (2)
  XinYu Liu (1) (2)
  Zhi Jin (1) (2)
  
• 关键词：HBT ; direct conversion ; modulator ; demodulator ; QPSK ; gigabit communication
• 刊名：Chinese Science Bulletin
• 出版年：2013
• 出版时间：January 2013
• 年：2013
• 卷：58
• 期：3
• 页码：427-432
• 全文大小：822KB
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  15. Freundorfer A P, Hamed K, Sun Y, et al. A direct digital 2 Gb/s modulator/demodulator experiment in GaAs HBT at 30 GHz. In: Proc Asia-Pacific Microwave Conf, 2006 12-5 Dec 2006, Yokohama, Yokohama. 1611-614
  
• 作者单位：YuXiong Cao (1) (2)
  DanYu Wu (1) (2)
  XinYu Liu (1) (2)
  Zhi Jin (1) (2)
  
  1. Institute of Microelectronics, Chinese Academy of Sciences, Beijing, 100029, China
  2. Key Laboratory of Microelectronics Devices & Integrated Technology, Institute of Microelectronics, Chinese Academy of Sciences, Beijing, 100029, China
  
• ISSN：1861-9541

文摘

The design and measured results of a broad-band direct quadrature phase shift keying (QPSK) modulator and demodulator are described in this paper. The circuits are fabricated using 1-μm GaAs HBT technology. To suppress the local oscillator (LO) leakage, the double-balanced mixer is selected as the core unit in the modulator/demodulator. An embedded four-way quadrature divider which includes a Lange coupler and two Baluns is utilized in the system to generate quadrature-phase LO signals. As results of a back-to-back test, the system can operate at data rates in excess of 2 Gb/s (1 Gb/s per I and Q channels) at 30 GHz. The supplies of the modulator and demodulator are 5.0 V and 4.5 V with size of 1.35 mm×3.5 mm and 1.36 mm×3.4 mm, respectively.