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This paper describes the design of a fractional-N frequency synthesizer for digital video broadcasting-terrestrial (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°in integer-N mode and less than 1°in fractional-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-μm CMOS process.
This paper describes the design of a fractional-N frequency synthesizer for digital video broadcasting-terrestrial (DVB-T) receivers. Transfers functions in differentially-tuned PLLs 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 ° in integer-N mode and less than 1 ° in fractional-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-μm CMOS process.