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Mortezapour, S. and E.K.F. Lee, 1999. Design of low-power ROM-less direct digital frequency synthesizer using nonlinear digital-to-analog converter. IEEE J. Solid-State Circ., 34: 1350-1359.
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Nicholas, H., H. Samueli and B. Kim, 1988. The optimization of DDFS performance in the presence of finite word length effects. Proceedings of the 42nd Annual Frequency Control Symposium, June 1-3, 1988, Baltimore, MD., pp: 357-363.

Sharma, R.K. and G. Upadhyaya, 2010. Memory reduced and fast DDS using FPGA. Int. J. Comput. Theory Eng., 2: 1793-8201.
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Sunderland, D.A., R.A. Strauch, S.S. Wharfield, H.T. Peterson and C.R. Cole, 1984. CMOS/SOS frequency synthesizer LSI circuit for spread spectrum communications. IEEE J. Solid-State Circ., 19: 497-506.
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Vankka, J. and K. Halonen, 2001. Direct digital synthesizers-Theory, design and application. Kluwer Academic Publishers, Boston.