摘要
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.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.
基金
Project supported by the National Natural Science Foundation of China(No.60876019)
the National S&T Major Project of China(No. 2009ZX0131-002-003-02)
the Shanghai Rising-Star Program,China(No.09QA1400300)
the National Scientists and Engineers Service for Enterprise Program,China(No.2009GJC00046).
