Abstract
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.
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Jri L, Yenlin H, Yentso C, et al. A low-power fully integrated 60 GHz transceiver system with OOK modulation and on-board antenna assembly. In: IEEE International Solid-State Circuits Conference (ISSCC), 2009 8–12 Feb 2009, San Francisco, CA. 16–318
Mahon S J, Convert E, Beasly P T, et al. Broadband integrated millimeter-wave up- and down-converter GaAs MMICs. IEEE Trans Microwave Theory Tech, 2006, 54: 2050–2060
Ioannis S, Sean T N, Alexander T, et al. An 18-Gb/s, direct QPSK modulation SiGe BiCOMS transceiver for last mile links in the 70–80 GHz band. IEEE J Soild-State Circuits, 2010, 45: 1968–1980
Jeng H T, Tian W H. 35–65 GHz CMOS broadband modulator and demodulator with sub-harmonic pumping for MMW wireless gigabit applications. IEEE Trans Microwave Theory Tech, 2007, 55: 2075–2085
Tomkins A, Aroca R A, Yamamoto T, et al. A zero-IF 60 GHz 65 nm CMOS transceiver with direct BPSK modulation demonstrating up to 6 Gb/s data rates over a 2 m wireless link. IEEE J Solid-State Circuits, 2009, 44: 2085–2099
Hong Y C, Pei S W, Tian W H, et al. Design and analysis of CMOS broad-band compact high-linearity modulators for gigabit microwave/millimeter-wave applications. IEEE Trans Microwave Theory Tech, 2006, 54: 20–30
McPherson D S, Lucyszyn S. Vector modulator for W-band software radar techniques. IEEE Trans Microwave Theory Tech, 2001, 49: 1451–1461
Chang H Y, Huang T W, Wang H. Broad-band HBT BPSK and IQ modulator MMICs and millimeter-wave vector signal characterization. IEEE Trans Microwave Theory Tech, 2004, 52: 908–919
Lockie D, Peck D. High-data-rate millimeter-wave radios. IEEE Microwave Mag, 2009, 10: 75–83
Hamed K W, Freundorfer A P, Antar Y M M, et al. A novel monolithic double balanced direct conversion mixer with an integrated broadband monolithic passive balun. IEEE J Solid-State Circuits, 2005, 40: 622–629
Lange J. Interdigitated stripline quadrature hybrid. IEEE Trans Microwave Theory Tech, 1969, 17: 1150–1151
Agilent ADS manual Version 2009U1, 2009
Hamed G K W, Freundorfer A P, Antar Y M M, et al. A high-bit rate Ka-band direct conversion QPSK demodulator. IEEE Microwave Wireless Compon Lett, 2008, 18: 365–367
Chang H Y, Weng S H, Chiong C C. A 30–50 GHz wide modulation bandwidth bidirectional BPSK demodulator/modulator with low LO power. IEEE Microwave Wireless Compon Lett, 2009, 19: 332–334
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 12–15 Dec 2006, Yokohama, Yokohama. 1611–1614
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Cao, Y., Wu, D., Liu, X. et al. Broad-band direct QPSK modulator/demodulator for wireless gigabit communication. Chin. Sci. Bull. 58, 427–432 (2013). https://doi.org/10.1007/s11434-012-5566-4
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DOI: https://doi.org/10.1007/s11434-012-5566-4