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El-Gabaly, A.M., 2007. Radio frequency direct-digital QPSK modulators in CMOS technology. M.Sc. Thesis, Queen�s University, Kingston

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Karl, H. and A. Willig, 2005. Protocols and Architectures for Wireless Sensor Networks. John Wiley and Sons Ltd., Chichester, England, ISBN: 0470095105, pp: 497.

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Saavedra, C.E. and B.R. Jackson, 2006. Voltage-variable attenuator MMIC using phase cancellation. IEE Proc. Circ. Devices Syst., 153: 442-446.
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Tiiliharju, E. and K. Halonen, 2003. A 0.75-3.6GHz SiGE direct-conversion quadrature-modulator. Proceedings of the 29th European Solid-State Circuits Conference, Sept. 16-18, IEEE Xplore, pp: 565-568.