A 驴驴 fractional- N synthesizer for GSM standard specifications

摘要

We describe in this paper a new method for the characterization and optimization with heuristic algorithm of fractional-N synthesizer. This method will be applied to GSM application. The treated synthesizer based in the use a type-II third order 驴驴 modulator generates signals in 935-960 MHz range with 200 KHz resolution with a spur of less than -80 dBc/Hz. Optimal parameters values are so determined and verified by different simulations.