A new high SNR Sigma-Delta Modulator for fractional-N frequency synthesizers

@article{Farrokhiyan2009ANH,
  title={A new high SNR Sigma-Delta Modulator for fractional-N frequency synthesizers},
  author={K. Farrokhiyan and Rasoul Dehghani},
  journal={2009 6th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology},
  year={2009},
  volume={01},
  pages={596-599}
}
This paper presents a new digital sigma-delta modulator with 16-bit input and a single bit stream output to control a dual modulus divider of a fractional-N frequency synthesizer. The design consists of two stages. The first stage is a second order error feedback Sigma-Delta Modulator that reduces the effective number of the input from 16 to 3 bits and latter stage used as a concentrator to produce a single bit output. The total SNR is more than 100dB while the complexity and OSR of the design… CONTINUE READING