A 2-to-2.4-GHz differentially-tuned fractional-Nfrequency synthesizer for DVB tuner applications

Meng Lingbu, Lu Lei, Zhao Wei, Tang Zhangwen
2010 Journal of Semiconductors  
This paper describes the design of a fractional-N frequency synthesizer for digital video broadcastingterrestrial (DVB-T) receivers. Transfer functions in differentially-tuned PLL are derived and loop parameters are designed. In addition, a fully-differential charge pump is presented. An 8/9 high speed prescaler is analyzed and the design considerations for the CML logic are also presented. Test results show that the RMS phase error is less than 0.7 ı in integer-N mode and less than 1 ı in
more » ... ional-N mode. The implemented frequency synthesizer draws 10 mA from a 1.8-V supply while occupying a die area of about 1-mm 2 in a 0.18-m CMOS process.
doi:10.1088/1674-4926/31/7/075007 fatcat:fxrj5errgzcenig5gpxardm7ba