GSM 900/DCS 1800 fractional-N modulator with two-point-modulation

  title={GSM 900/DCS 1800 fractional-N modulator with two-point-modulation},
  author={Burkhard Neurauter and G. Marzinger and Adam Schwarz and R. Vuketich},
  journal={2002 IEEE MTT-S International Microwave Symposium Digest (Cat. No.02CH37278)},
  pages={425-428 vol.1}
This paper presents a fractional-N modulator architecture that uses the technique of two-point-modulation. This technique allows direct modulation of the VCO within the closed loop of a high resolution PLL based fractional-N frequency synthesizer, without restriction due to loop bandwidth and PLL dynamics. A prototype transmitter was implemented using the GSM standard to verify the superior performance predicted by simulation. The core element of this new modulator architecture is a PLL-based… CONTINUE READING
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