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A low-power CMOS frequency synthesizer design methodology for wireless applications

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2 Author(s)
Fahim, A.M. ; Dept. of Electr. & Comput. Eng., Waterloo Univ., Ont., Canada ; Elmasry, M.I.

A new methodology is developed to allow design space exploration of CMOS frequency synthesizers (FS) for wireless applications. This methodology allows the comparison of different phase locked loop (PLL) and direct digital synthesizer (DDFS) architectures in terms of their spectral purity and power dissipation. An optimization strategy in which both the lock time and the phase noise are constrained while minimizing power dissipation has been constructed. The first order performance models used for this methodology have been verified to be accurate up to 5% of HPSICE simulations. Using this methodology, it is shown that a dual-modulus fractional-N PLL with a digital sigma-delta modulator is best suited for the Mobitex wireless data communications standard in terms of power minimization and output spectral purity

Published in:

Circuits and Systems, 1999. ISCAS '99. Proceedings of the 1999 IEEE International Symposium on  (Volume:2 )

Date of Conference:

Jul 1999

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